Features
16V to 40VDC Input Range (28VDC Nominal)
Single and Dual Outputs
12W Output Power
22.8W/in3 Power Density
Low Input / Output Noise
(50mA / 60mVP-P max. respectively)
Indefinite Short Circuit and Overload Protection
Wideband Control Loop for Superior Transient
Characteristics
No derating for -55°C to +125°C Operation
Constant Switching Frequency
(550kHz Nominal)
Standard Microcircuit Drawings Available
HYBRID-HIGH RELIABILITY
DC-DC CONVERTER
AHF
AHF SERIES
Description
The AHF Series of DC-DC converters feature single or dual
outputs over the full military temperature range. No derating
in output power is required, making them suitable for use in
rugged military applications. The low profile, small outline
package is ideally suited to the tight board space require-
ments of many industrial and aerospace applications.
Designed for nominal 28Vdc inputs, this family of converters
will meet the requirements of MIL-STD-704D. The basic cir-
cuit utilizes a pulse width modulated, feed-forward topology
at a nominal switching frequency of 550KHz. Input to output
isolation is achieved through the use of transformers in the
forward and feedback circuits.
The proprietary magnetic feedback circuit provides for an
extremely wide bandwidth control loop with a high phase
margin. The closed loop frequency response of this converter
family extends to approximately 50kHz, resulting in superior
line and load transient characteristics. This feedback method
is also inherently temperature and radiation insensitive. This
gives the AHF Series an important advantage over convert-
ers that incorporate opto-couplers in their design.
Manufactured in a facility fully qualified to MIL-PRF-38534,
these converters are fabricated utilizing DLA qualified process.
For available screening options, refer to device screening
table in the data sheet. Variations are electrical, mechanical
and screening can be accommodated.
Extensive computer simulation using complex modeling
enables rapid design modification to be provided. Contact IR
HiRel San Jose with specific requirements.
1 2017-05-08
PD-94541E
28V Input, Single/Dual Output
2 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Specifications AHF2803R3S
Absolute Maximum Ratings
Input Voltage -0.5Vdc to +50VDC
Soldering temperature +300°C for 10 seconds
Operating case temperature -55°C to +125°C
Storage case temperature -65°C to +135°C
For Notes to Electrical Performance Characteristics, refer to page 3
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output voltage VOUT IOUT = 5% of rated load
1
01
3.26 3.34
V
2,3 3.23 3.36
Output current1 I
OUT V
IN = 16, 28, and 40Vdc 1,2,3 01 3030 mA
Output power POUT V
IN = 16, 28, and 40Vdc 1,2,3 01 10 W
Output ripple voltage2
VRIP VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
1,2,3
01
60
mVp-p
Line regulation
VRLINE VIN = 16, 28, and 40Vdc,
IOUT = 5%, 50% and 100%
rated load
1,2,3
01
25
mV
Load regulation
VRLOAD VIN = 16, 28, and 40Vdc,
IOUT = 5%, 50% and 100%
rated load
1,2,3
01
50
mV
Input current IIN
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7) 1,2,3 01
12
mA
IOUT = 0,
Inhibit (Pin 1) = open
30
Input ripple current2
IRIP IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
01
50
mAp-p
Efficiency
EFF
IOUT = 100% rated load 1
01 70
2,3 68
Isolation
ISO
Input to output or any pin
to case (except Pin 6) at
500Vdc TC = +25°C
1
01
100
M
Capacitive load3,4
CL No effect on dc performance,
TC = +25°C
4
01
500
µF
Power dissipation
load fault
PD Overload 5 1 01
6.0
W
Short circuit 1,2,3 01 2.0
Switching frequency FS I
OUT = 100% rated load 4,5,6 01 500 600 kHz
%
Table I. Electrical Performance Characteristics
3 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output response to
step transient load
changes6
VOTLOAD
50% to/from 100% rated
load 4,5,6
01
-300 +300
mVpk
5% to/from 50% rated load 4,5,6 -500 +500
Recovery time step
transient load
changes6.7
TTLOAD
50% to/from 100% rated
load 4,5,6 70 µs
5% to 50% rated load 4,5,6 1200 µs
50% to 5% rated load 4,5,6 8.0 ms
Output response to
transient step line
changes
VOTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 8
4,5,6
01
500
mVpk
Recovery time
transient step line
changes
TTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 7, 8
4,5,6 01
800 µs
Turn on overshoot VTonOS IOUT = 5 and 100% rated
load
4,5,6
01
600
mVpk
Turn on delay
TonD
IOUT = 5 and 100% rated
load 9
4,5,6
01
20
ms
Load fault recovery4,9
TrLF
4,5,6
01
20
ms
Weight 38 g
01
Table I. Electrical Performance Characteristics (continued) AHF2803R3S
1. Parameter guaranteed by line and load regulation tests.
2. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
3. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the
operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
4. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table I.
5. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short
circuit protection and is the condition of maximum power dissipation.
6. Load step transition time between 2 and 10 microseconds.
7. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT
at 50 percent load.
8. Input step transition time between 2 and 10 microseconds.
9. Turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal
from the Inhibit Pin (Pin 1) while power is applied to the input is unlimited.
Notes to Table I:
4 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Specifications AHF2805S
Absolute Maximum Ratings
Input Voltage -0.5Vdc to +50VDC
Soldering temperature +300°C for 10 seconds
Operating case temperature -55°C to +125°C
Storage case temperature -65°C to +135°C
For Notes to Electrical Performance Characteristics, refer to page 5
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output voltage VOUT IOUT = 0
1
01
4.95 5.05
V
2,3 4.90 5.10
Output current1 I
OUT V
IN = 16, 28, and 40Vdc 1,2,3 01 2400 mA
Output power POUT V
IN = 16, 28, and 40Vdc 1,2,3 01 12 W
Output ripple voltage2
VRIP VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
1,2,3
01
60
mVp-p
Line regulation
VRLINE VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
25
mV
Load regulation
VRLOAD VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
50
mV
Input current IIN
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7) 1,2,3 01
12
mA
IOUT = 0,
Inhibit (Pin 1) = open
30
Input ripple current2
IRIP IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
01
50
mAp-p
Efficiency
EFF
IOUT = 100% rated load 1
01 76
2,3 74
Isolation
ISO
Input to output or any pin
to case (except Pin 6) at
500Vdc TC = +25°C
1
01
100
M
Capacitive load3,4
CL No effect on dc performance,
TC = +25°C
4
01
500
µF
Power dissipation
load fault
PD Overload 5 1 01
6.0
W
Short circuit 1,2,3 01 2.0
Switching frequency FS I
OUT = 100% rated load 4,5,6 01 500 600 kHz
%
Table II. Electrical Performance Characteristics
5 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output response to
step transient load
changes6
VOTLOAD
50% to/from 100% rated
load 4,5,6
01
-300 +300
mVpk
0% to/from 50% rated load 4,5,6 -500 +500
Recovery time step
transient load
changes6.7
TTLOAD
50% to/from 100% rated
load 4,5,6 70 µs
0% to 50% rated load 4,5,6 1200 µs
50% to 0% rated load 4,5,6 8.0 ms
Output response to
transient step line
changes
VOTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 8
4,5,6
01
500
mVpk
Recovery time
transient step line
changes
TTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 7, 8
4,5,6 01
800 µs
Turn on overshoot VTonOS IOUT = 0 and 100% rated
load
4,5,6
01
600
mVpk
Turn on delay
TonD
IOUT = 0 and 100% rated
load 9
4,5,6
01
20
ms
Load fault recovery4,9
TrLF
4,5,6
01
20
ms
Weight 38 g
01
AHF2805S
1. Parameter guaranteed by line and load regulation tests.
2. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
3. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the
operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
4. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table II.
5. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short
circuit protection and is the condition of maximum power dissipation.
6. Load step transition time between 2 and 10 microseconds.
7. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT
at 50 percent load.
8. Input step transition time between 2 and 10 microseconds.
9. Turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal
from the Inhibit Pin (Pin 1) while power is applied to the input is unlimited.
Notes to Table II:
Table II. Electrical Performance Characteristics (continued)
6 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Specifications AHF2812S
Absolute Maximum Ratings
Input Voltage -0.5Vdc to +50VDC
Soldering temperature +300°C for 10 seconds
Operating case temperature -55°C to +125°C
Storage case temperature -65°C to +135°C
For Notes to Electrical Performance Characteristics, refer to page 7
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output voltage VOUT IOUT = 0
1
01
11.88 12.12
V
2,3 11.76 12.24
Output current1 I
OUT V
IN = 16, 28, and 40Vdc 1,2,3 01 1000 mA
Output power POUT V
IN = 16, 28, and 40Vdc 1,2,3 01 12 W
Output ripple voltage2
VRIP VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
1,2,3
01
60
mVp-p
Line regulation
VRLINE VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
50
mV
Load regulation
VRLOAD VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
50
mV
Input current IIN
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7) 1,2,3 01
12
mA
IOUT = 0,
Inhibit (Pin 1) = open
50
Input ripple current2
IRIP IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
01
50
mAp-p
Efficiency
EFF
IOUT = 100% rated load 1
01 78
2,3 75
Isolation
ISO
Input to output or any pin
to case (except Pin 6) at
500Vdc TC = +25°C
1
01
100
M
Capacitive load3,4
CL No effect on dc performance,
TC = +25°C
4
01
200
µF
Power dissipation
load fault
PD Overload 5 1 01
6.0
W
Short circuit 1,2,3 01 2.0
Switching frequency FS I
OUT = 100% rated load 4,5,6 01 500 600 kHz
%
Table III. Electrical Performance Characteristics
7 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output response to
step transient load
changes6
VOTLOAD
50% to/from 100% rated load
4
01
-300 +300
5,6 -450 +450
0% to/from 50% rated load
4 -500 +500
5,6 -750 +750
Recovery time step
transient load
changes6.7
TTLOAD 50% to/from 100% rated load 4,5,6
01
100 µs
0% to 50% rated load 4,5,6 1500 µs
50% to 0% rated load 4,5,6 10 ms
Output response to
transient step line
changes
VOTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 8
4,5,6
01
1500
mVpk
Recovery time
transient step line
changes
TTLINE Input step 16V to/from 40Vdc,
IOUT = 100% rated load 4, 7, 8 4,5,6 01
800 µs
Turn on overshoot VTonOS I
OUT = 0 and 100% rated load
4,5,6
01
600
mVpk
Turn on delay
TonD
IOUT = 0 and 100% rated
load 9
4,5,6
01
20
ms
Load fault recovery4,9
TrLF
4,5,6
01
20
ms
Weight 38 g
mVpk
AHF2812S
1. Parameter guaranteed by line and load regulation tests.
2. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
3. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the
operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
4. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table III.
5. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short
circuit protection and is the condition of maximum power dissipation.
6. Load step transition time between 2 and 10 microseconds.
7. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT
at 50 percent load.
8. Input step transition time between 2 and 10 microseconds.
9. Turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal
from the Inhibit Pin (Pin 1) while power is applied to the input is unlimited.
Notes to Table III:
Table III. Electrical Performance Characteristics (continued)
8 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Specifications AHF2815S
Absolute Maximum Ratings
Input Voltage -0.5Vdc to +50VDC
Soldering temperature +300°C for 10 seconds
Operating case temperature -55°C to +125°C
Storage case temperature -65°C to +135°C
For Notes to Electrical Performance Characteristics, refer to page 9
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output voltage VOUT IOUT = 0
1
01
14.85 15.15
V
2,3 14.70 15.30
Output current1 I
OUT V
IN = 16, 28, and 40Vdc 1,2,3 01 800 mA
Output power POUT V
IN = 16, 28, and 40Vdc 1,2,3 01 12 W
Output ripple voltage2
VRIP VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
1,2,3
01
60
mVp-p
Line regulation
VRLINE VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
50
mV
Load regulation
VRLOAD VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
50
mV
Input current IIN
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7) 1,2,3 01
12
mA
IOUT = 0,
Inhibit (Pin 1) = open
40
Input ripple current2
IRIP IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
01
50
mAp-p
Efficiency
EFF
IOUT = 100% rated load 1
01 78
2,3 75
Isolation
ISO
Input to output or any pin
to case (except Pin 6) at
500Vdc TC = +25°C
1
01
100
M
Capacitive load3,4
CL No effect on dc performance,
TC = +25°C
4
01
200
µF
Power dissipation
load fault
PD Overload 5 1 01
6.0
W
Short circuit 1,2,3 01 2.0
Switching frequency FS I
OUT = 100% rated load 4,5,6 01 500 600 kHz
%
Table IV. Electrical Performance Characteristics
9 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output response to
step transient load
changes6
VOTLOAD
50% to/from 100% rated load 4,5,6
01
-300 +300
mVpk
0% to/from 50% rated load 4,5,6 -750 +750
Recovery time step
transient load
changes6.7
TTLOAD 50% to/from 100% rated load 4,5,6 100 µs
0% to 50% rated load 4,5,6 1500 µs
50% to 0% rated load 4,5,6 10 ms
Output response to
transient step line
changes
VOTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 8
4,5,6 01 -1500 +1500
mVpk
Recovery time
transient step line
changes
TTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load 4, 7, 8
4,5,6 01
800 µs
Turn on overshoot VTonOS I
OUT = 0 and 100% rated load
4,5,6
01
750
mVpk
Turn on delay
TonD
IOUT = 0 and 100% rated
load 9
4,5,6
01
20
ms
Load fault recovery4,9
TrLF
4,5,6
01
20
ms
Weight 38 g
01
AHF2815S
1. Parameter guaranteed by line and load regulation tests.
2. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
3. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive in excess of the maximum limit will not disturb loop stability but may interfere with the
operation of the load fault detection circuitry, appearing as a short circuit during turn-on.
4. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table IV.
5. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short
circuit protection and is the condition of maximum power dissipation.
6. Load step transition time between 2 and 10 microseconds.
7. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT
at 50 percent load.
8. Input step transition time between 2 and 10 microseconds.
9. Turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal
from the Inhibit Pin (Pin 1) while power is applied to the input is unlimited.
Notes to Table IV:
Table IV. Electrical Performance Characteristics (continued)
10 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Specifications AHF2805D
Absolute Maximum Ratings
Input Voltage -0.5Vdc to +50VDC
Soldering temperature +300°C for 10 seconds
Operating case temperature -55°C to +125°C
Storage case temperature -65°C to +135°C
For Notes to Electrical Performance Characteristics, refer to page 11
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output voltage VOUT IOUT = 0
1
01
±4.95 ±5.05
V
2,3 ±4.90 ±5.10
Output current1,2 I
OUT VIN = 16, 28, and 40Vdc,
each output 1,2,3 01 120 1080 mA
Output power POUT V
IN = 16, 28, and 40Vdc 1,2,3 01 12 W
Output ripple voltage3
VRIP VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
1,2,3
01
60
mVp-p
Line regulation4
VRLINE VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
30
mV
Load regulation4
VRLOAD
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
30
mV
Cross regulation5 VRCROSS 10% to 90% load changes 1,2,3 01 ±10 %
Input current IIN
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7) 1,2,3 01
12
mA
IOUT = 0,
Inhibit (Pin 1) = open
60
Input ripple current3,4
IRIP IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
01
50
mAp-p
Efficiency4
EFF
IOUT = 100% rated load 1,3
01 75
%
2 72
Isolation
ISO
Input to output or any pin
to case (except Pin 6) at
500Vdc TC = +25°C
1
01
100
M
Capacitive load6,7
CL No effect on dc performance,
TC = +25°C
4
01
200
µF
Power dissipation
load fault
PD Overload
1,2,3
6.0
W
Short circuit 2.0
Switching frequency FS I
OUT = 100% rated load 4,5,6 01 500 600 kHz
01
Table V. Electrical Performance Characteristics
11 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output response to
step transient load
changes4, 9
VOTLOAD
50% to/from 100% rated
load 4,5,6
01
-400 +400
mVpk
0% to/from 50% rated load 4,5,6 -800 +800
Recovery time step
transient load
changes.4, 9, 10
TTLOAD
50% to/from 100% rated
load 4,5,6
01
100 µs
0% to 50% rated load 4,5,6 5000 µs
Output response to
transient step line
changes4, 7, 11
VOTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load
4,5,6 01 -400 +400 mVpk
Recovery time
transient step line
changes4, 7, 10, 11
TTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load
4,5,6 01
1200 µs
Turn on overshoot4 VTonOS IOUT = 0 and 100% rated
load
4,5,6
01
600
mVpk
Turn on delay
TonD
IOUT = 0 and 100% rated
load9
4,5,6
01
25
ms
Load fault recovery4,9
TrLF
4,5,6
01
25
ms
Weight 38 g
AHF2805D
Notes to Table V:
Table V. Electrical Performance Characteristics (continued)
1. Parameter guaranteed by line load and cross regulation tests.
2. Up to 90 percent of full power is available from either output provided the total output does not exceed 12W.
3. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
4. Load current split equally between +VOUT and -VOUT.
5. 1.2 watt load on output under test, 1.2 watt to 10.8 watt load change on other output.
6. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operaonoftheload
fault detection circuitry, appearing as a short circuit during turn-on.
7. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table V.
8. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit
protection and is the condition of maximum power dissipation.
9. Load step transition time between 2 and 10 microseconds.
10. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT at 50 percent
load.
11. Input step transition time between 2 and 10 microseconds.
12. Turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the
Inhibit Pin (Pin 1) while power is applied to the input.
12 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Specifications AHF2812D
Absolute Maximum Ratings
Input Voltage -0.5Vdc to +50VDC
Soldering temperature +300°C for 10 seconds
Operating case temperature -55°C to +125°C
Storage case temperature -65°C to +135°C
For Notes to Electrical Performance Characteristics, refer to page 13
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output voltage VOUT IOUT = 0
1
01
±11.88 ±12.12
V
2,3 ±11.76 ±12.24
Output current1,2 I
OUT VIN = 16, 28, and 40Vdc,
each output 1,2,3 01 100 900 mA
Output power POUT V
IN = 16, 28, and 40Vdc 1,2,3 01 12 W
Output ripple voltage3
VRIP VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
1,2,3
01
60
mVp-p
Line regulation4
VRLINE VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
30
mV
Load regulation4
VRLOAD
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
30
mV
Cross regulation5 VRCROSS 10% to 90% load changes 1,2,3 01 3.0 %
Input current IIN
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7) 1,2,3 01
12
mA
IOUT = 0,
Inhibit (Pin 1) = open
60
Input ripple current3,4
IRIP IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
01
50
mAp-p
Efficiency4
EFF
IOUT = 100% rated load 1,3
01 77
%
2 74
Isolation
ISO
Input to output or any pin
to case (except Pin 6) at
500Vdc TC = +25°C
1
01
100
M
Capacitive load6,7
CL No effect on dc perfor-
mance, TC = +25°C
4
01
200
µF
Power dissipation
load fault
PD Overload
1,2,3
6.0
W
Short circuit 3.0
Switching frequency FS I
OUT = 100% rated load 4,5,6 01 500 600 kHz
01
Table VI. Electrical Performance Characteristics
13 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output response to
step transient load
changes4, 9
VOTLOAD
50% to/from 100% rated
load 4,5,6
01
-200 +200
mVpk
0% to/from 50% rated load 4,5,6 -800 +800
Recovery time step
transient load
changes.4, 9, 10
TTLOAD
50% to/from 100% rated
load 4,5,6
01
70 µs
0% to 50% rated load 4,5,6 2000 µs
Output response to
transient step line
changes4, 7, 11
VOTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load
4,5,6 01 -750 +750 mVpk
Recovery time
transient step line
changes4, 7, 10, 11
TTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load
4,5,6 01
1200 µs
Turn on overshoot4 VTonOS IOUT = 0 and 100% rated
load
4,5,6
01
600
mVpk
Turn on delay
TonD
IOUT = 0 and 100% rated
load9
4,5,6
01
25
ms
Load fault recovery4,9
TrLF
4,5,6
01
25
ms
Weight 38 g
AHF2812D
Notes to Table VI:
Table VI. Electrical Performance Characteristics (continued)
1. Parameter guaranteed by line load and cross regulation tests.
2. Up to 90 percent of full power is available from either output provided the total output does not exceed 12W.
3. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
4. Load current split equally between +VOUT and -VOUT.
5. 1.2 watt load on output under test, 1.2 watt to 10.8 watt load change on other output.
6. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operaonoftheload
fault detection circuitry, appearing as a short circuit during turn-on.
7. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table VI.
8. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit
protection and is the condition of maximum power dissipation.
9. Load step transition time between 2 and 10 microseconds.
10. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT at 50 percent
load.
11. Input step transition time between 2 and 10 microseconds.
12. Turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the
Inhibit Pin (Pin 1) while power is applied to the input.
14 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Specifications AHF2815D
Absolute Maximum Ratings
Input Voltage -0.5Vdc to +50VDC
Soldering temperature +300°C for 10 seconds
Operating case temperature -55°C to +125°C
Storage case temperature -65°C to +135°C
For Notes to Electrical Performance Characteristics, refer to page 15
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output voltage VOUT IOUT = 0
1
01
±14.85 ±15.15
V
2,3 ±14.70 ±15.30
Output current1,2 I
OUT VIN = 16, 28, and 40Vdc,
each output 1,2,3 01 80 720 mA
Output power POUT V
IN = 16, 28, and 40Vdc 1,2,3 01 12 W
Output ripple voltage3
VRIP VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
1,2,3
01
60
mVp-p
Line regulation4
VRLINE VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
35
mV
Load regulation4
VRLOAD
VIN = 16, 28, and 40Vdc,
IOUT = 0, 50% and 100%
rated load
1,2,3
01
35
mV
Cross regulation5 VRCROSS 10% to 90% load changes 1,2,3 01 3.0 %
Input current IIN
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7) 1,2,3 01
12
mA
IOUT = 0,
Inhibit (Pin 1) = open
60
Input ripple current3,4
IRIP IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
01
50
mAp-p
Efficiency4
EFF IOUT = 100% rated load 1,3 78
%
2 74
Isolation
ISO
Input to output or any pin
to case (except Pin 6) at
500Vdc TC = +25°C
1
01
100
M
Capacitive load6,7
CL No effect on dc perfor-
mance, TC = +25°C
4
01
200
µF
Power dissipation
load fault
PD Overload
1,2,3 01
6.0
W
Short circuit 2.5
Switching frequency FS I
OUT = 100% rated load 4,5,6 01 500 600 kHz
01
Table VII. Electrical Performance Characteristics
15 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Unit
Min
Max
Output response to
step transient load
changes4, 9
VOTLOAD
50% to/from 100% rated
load 4,5,6
01
-200 +200
mVpk
0% to/from 50% rated load 4,5,6 -800 +800
Recovery time step
transient load
changes.4, 9, 10
TTLOAD
50% to/from 100% rated
load 4,5,6
01
70 µs
0% to 50% rated load 4,5,6 2000 µs
Output response to
transient step line
changes4, 7, 11
VOTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load
4,5,6 01 -750 +750 mVpk
Recovery time
transient step line
changes4, 7, 10, 11
TTLINE Input step 16V to/from
40Vdc, IOUT = 100% rated
load
4,5,6 01
1200 µs
Turn on overshoot4 VTonOS IOUT = 0 and 100% rated
load
4,5,6
01
750
mVpk
Turn on delay
TonD
IOUT = 0 and 100% rated
load9
4,5,6
01
25
ms
Load fault recovery4,9
TrLF
4,5,6
01
25
ms
Weight 38 g
AHF2815D
Notes to Table VII:
Table VII. Electrical Performance Characteristics (continued)
1. Parameter guaranteed by line load and cross regulation tests.
2. Up to 90 percent of full power is available from either output provided the total output does not exceed 12W.
3. Bandwidth guaranteed by design. Tested for 20kHz to 2MHz.
4. Load current split equally between +VOUT and -VOUT.
5. 1.2 watt load on output under test, 1.2 watt to 10.8 watt load change on other output.
6. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operaonoftheload
fault detection circuitry, appearing as a short circuit during turn-on.
7. Parameter shall be tested as part of design characterization and after design or process changes.
Thereafter, parameters shall be guaranteed to the limits specified in Table VII.
8. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit
protection and is the condition of maximum power dissipation.
9. Load step transition time between 2 and 10 microseconds.
10. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1 percent of VOUT at 50 percent
load.
11. Input step transition time between 2 and 10 microseconds.
12. Turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the
Inhibit Pin (Pin 1) while power is applied to the input.
16 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Application Information
Inhibit Function (Enable)
Connecting the Enable Input (Pin 1) to Input Common (Pin
7) will cause the converter to shut down. It is recommended
that the Enable Pin be driven by an open collector device
capable of sinking at least 400A of current. The open
circuit voltage of the Enable Input is 15±1.0VDC. If the Inhibit
function is not used, this Input can be left unconnected
because it is internally pulled-up.
Thermal Management
Assuming that there is no forced air flow, the package
temperature rise above ambient (T) may be calculated
using the following expression:
where A = Effective surface area in square inches
(including heat sink if used), P = Power dissipation in watts.
The total surface area of the AHF package is 4.9 square
inches. If a worst case full load efficiency of 78% is
assumed, then the case temperature rise can be calculated
as follows:
Hence if TAMBIENT = +25°C, the DC-DC converter case
temperature will be approximately 100°C if no heat
sink or air flow is provided.
To calculate the heat sink area required to maintain a
specific case temperature rise, the above equation
may be manipulated as follows:
As an example, if a maximum case temperature rise of
50°C above ambient is desired, then the required
effective heat sink area is:
17 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Block Diagrams
Single Output
Dual Output
4
3
+Vout
Output
Return
Pulse Width
Modulator
Primary
Housekeeping
Supply
EMI
Filter
Under-Voltage
Detector
8
1
7
+Input
Enable Input
Input Return
Error
Amp &
Ref
FB
CS
Drive
6
Case
2
3
+Vout
Output
Return
Pulse Width
Modulator
Primary
Housekeeping
Supply
EMI
Filter
Under-Voltage
Detector
8
7
+Input
Enable Input
Input Return
Error
Amp &
Ref
FB
CS
Drive
4-Vout
6
Case
1
18 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Pin Designation Tables
Mechanical Outlines
Single Output Dual Output
Pin # Designation
1 Enable Input
2 +Output
3 Output Return
4 -Output
5 NC
6 Case Ground
7 Input Return
8 +Input
Pin # Designation
1 Enable Input
2 NC
3 Output Return
4 +Output
5 NC
6 Case Ground
7 Input Return
8 +Input
The Tolerance for X.XXX = 0.005”
1.450
(36.83)
0.260
(6.600)
0.030 dia., 8 pins
(0.760)
0.800
(20.32)
4
7
5
8
6
1
2
3
1.120
(28.45)
0.090 R Typ
(2.290)
0.330
(8.380)
MAX
1.105
(28.07)
0.905
(22.99)
0.705
(17.91)
0.505
(12.83)
0.205
(5.21)
Non-Flanged
The Tolerance for X.XXX = 0.005”
Flanged
Standard Microcircuit Drawing Equivalence Table
Standard Microcircuit IR Hirel Standard
Drawing Number Part Number
5962-91600 AHF2805S
5962-94568 AHF2812S
Vendor Cage
Code
52467
52467
5962-94563 52467 AHF2815S
5962-05205 52467 AHF2805D
5962-92111 52467 AHF2812D
5962-92351 52467 AHF2815D
19 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
Device Screening
Notes:
Best commercial practice.
Sample tests at low and high temperatures.
-55°C to +105°C for AHE, ATO, ATW.
Part Numbering
Requirement MIL-STD-883 Method No Suffix ES CH
Temperature Range — -20°C to +85°C -55°C to +125°C -55°C to +125°C
Element Evaluation MIL-PRF-38534 N/A N/A Class H
Non-Destructive Bond Pull 2023 N/A N/A N/A
Internal Visual 2017 Yes Yes
Temperature Cycle 1010 N/A Cond B Cond C
Constant Acceleration 2001, Y1 Axis N/A 500 Gs 3000 Gs
PIND 2020 N/A N/A N/A
Burn-In 1015
N/A 48 hrs @ hi temp 160 hrs @ 125°C
Final Electrical
(Group A)
MIL-PRF-38534
& Specification
25°C
25°C
-55°C, +25°C,
+125°C
PDA MIL-PRF-38534 N/A N/A 10%
Seal, Fine and Gross 1014 Cond A Cond A, C Cond A, C
Radiographic 2012 N/A N/A N/A
External Visual 2009 Yes Yes
HB
-55°C to +125°C
N/A
N/A
Yes
Cond C
3000 Gs
N/A
160hrs @ 125°C
-55°C, +25°C,
+125°C
N/A
Cond A, C
N/A
Yes
IR HiRel Headquarters: 101 N. Sepulveda Blvd., El Segundo, California 90245, USA Tel: (310) 252-7105
IR HiRel Leominster: 205 Crawford St., Leominster, Massachusetts 01453, USA Tel: (978) 534-5776
IR HiRel San Jose: 2520 Junction Avenue, San Jose, California 95134, USA Tel: (408) 434-5000
Data and specifications subject to change without notice.
20 2017-05-08
AHF SERIES
(28V Input, Single/Dual Output)
IMPORTANT NOTICE
The information given in this document shall be in no event regarded as guarantee of conditions or characteristic. The
data contained herein is a characterization of the component based on internal standards and is intended to
demonstrate and provide guidance for typical part performance. It will require further evaluation, qualification and
analysis to determine suitability in the application environment to confirm compliance to your system requirements.
With respect to any example hints or any typical values stated herein and/or any information regarding the application of
the product, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind including without
limitation warranties on non- infringement of intellectual property rights and any third party.
In addition, any information given in this document is subject to customer’s compliance with its obligations stated in this
document and any applicable legal requirements, norms and standards concerning customer’s product and any use of
the product of Infineon Technologies in customer’s applications.
The data contained in this document is exclusively intended for technically trained staff. It is the responsibility of any
customer’s technical departments to evaluate the suitability of the product for the intended applications and the
completeness of the product information given in this document with respect to applications.
For further information on the product, technology, delivery terms and conditions and prices, please contact your local
sales representative or go to (www.infineon.com/hirel).
WARNING
Due to technical requirements products may contain dangerous substances. For information on the types in question,
please contact your nearest Infineon Technologies office.
