Data Sheet
November 2001
HW025 Dual Positive Output-Series Power Modules: dc-dc Converter:
36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25 W
Applications
■
Distributed power architectures
■
Communications equipment
■
Computer equipment
Options
■
Remote on/off logic choice (positive or negative)
■
Surface Mount
■
Basic Insulation
Features
■
Low profile
■
Small size: 54.4 mm x 57.4 mm x 7.5 mm
(2.14 in. x 2.26 in. x 0.29 in.)
■
High efficiency: 85% typical
■
Two tightly regulated outputs
■
Flexible current allocation between outputs
■
Fixed frequency
■
Remote on/off
■
Output voltage adjustment (trim)
■
Output overcurrent protection
■
Overtemperature protection
■
Meets the voltage isolation requirements for
ETSI 300-132-2 and complies with and is Licensed
for Basic Insulation rating per EN60950 (-B option)
■
Wide operating temperature range
(–40 °C to 100 °C)
■
UL
*
60950
Recognized,
CSA
†
C22.2 No. 60950-00
Certified, and
VDE
‡
0805 (EN60950)
Licensed
■
CE mark meets 73/23/EEC and 93/68/EEC
directives
§
Description
The HW025 Dual Positive Output-Series Power Modules are open frame dc-dc converters that oper ate over an
input voltage range of 36 Vdc to 75 Vdc and provide two, independent, precisely regulated positive outputs.
The modules have a maximum power rating of 25 W with a typical full-load efficiency of 85%. The circuit
architecture allows power to be traded between the two outputs, while maintaining a high efficiency.
*
UL
is a registered trademark of Underwriters Laboratories, Inc.
†
CSA
is a registered trademark of Canadian Standards Association.
‡
VDE
is a trademark of Verband Deutscher Elektrotechniker e.V.
§ This product is intended for integration into end-use equipment. All the required procedures f or CE marking of end-use equipment should
be followed. (The CE mark is placed on selected products.)
The HW025 Dual Positive Output-Series Power Modules use
adv anced, surface-mount technology and deliver high-quality,
efficient, and compact dc-dc conversion.
2 Tyco Electronics Corp.
Data Sheet
November 2001
36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are
absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in
excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for
extended periods can adversely affect device reliability.
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Table 1. Input Specifications
Fusing Considerations
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple stand-alone operation to an
integrated part of a sophisticated power architecture. To preserve maximum flexibility, internal fusing is not
included; however, to achieve maximum safety and system protection, always use an input line fuse. The safety
agencies require a normal-blow fuse with a maximum rating of 3 A (see Safety Considerations section). Based on
the information provided in this data sheet on inrush energy and maximum dc input current, the same type of fuse
with a lower rating can be used. Refer to the fuse manufacturer’s data for further information.
Parameter Symbol Min Max Unit
Input Voltage:
Continuous
Transient (2ms) V
I
V
I,
trans
—
—80
100 Vdc
V
Operating Ambient Temperature
(See Thermal Considerations section) T
A
–40 100 °C
Storage Temperature T
stg
–55 105 °C
I/O Isolation Voltage — — 1500 Vdc
Parameter Symbol Min Typ Max Unit
Operating Input Voltage V
I
36 48 75 Vdc
Maximum Input Current
(V
I
= 0 V to 75 V; I
O
= I
O
,
max
; see Figures 1
and 2.)
I
I, max
— — 1.1 A
Inrush Transient — — — 1.0 A
2
s
Input Reflected-ripple Current, Peak-to-peak
(5 Hz to 20 MHz, 12 µH source impedance;
see Figure 15)
I
I
— 4 — mAp-p
Input Ripple Rejection (120 Hz) — — 54 — dB
EMC, EN55022
(V
I
,
nom
, full load) See EMC Considerations section.
Tyco Electronics Corp. 3
Data Sheet
November 2001 36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Electrical Specifications
(continued)
Table 2. Output Specifications
* It is recommended that the output capacitance’s are balanced, where possible. Consult your sales representative or the factory for higher
capacitance.
† These are manufacturing test limits. In some situations, results may differ.
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set Point
(V
I
= 48 V; I
O1
= I
O2 =
2.5 A
; T
A
= 25 °C) HW025AF
HW025FG
V
O1, set
V
O2, set
V
O1, set
V
O2, set
4.92
3.25
3.25
2.46
5.00
3.30
3.30
2.50
5.08
3.35
3.35
2.54
Vdc
Vdc
Vdc
Vdc
Output Voltage
(Over all operating input voltage, resistive
load, and temperature conditions until end
of life.)
HW025AF
HW025FG
V
O1
V
O2
V
O1
V
O2
4.78
3.16
3.16
2.39
—
—
—
—
5.21
3.44
3.44
2.61
Vdc
Vdc
Vdc
Vdc
Output Regulation:
Line (V
I
= 36 V to 75 V)
Load (I
O
= I
O, min
to I
O, max
)
Temperature (T
A
= –40 °C to + 70 °C)
All
All
All
—
—
—
—
—
—
0.01
0.05
0.60
0.2
0.2
2.0
%V
O
%V
O
%V
O
Output Ripple and Noise Voltage (see
Figures 9 and 16):
RMS (5 Hz to 20 MHz bandwidth)
Peak-to-peak (5 Hz to 20 MHz bandwidth) All
All —
——
——
70 30
100 mVrms
mVp-p
External Load Capacitance All C
VO1, max
C
VO2, max
0
0—
—100*
100* µF
µF
Output Current
NOTE: The maximum combined output
current must not exceed 5A.
All
All
All
I
O1
I
O2
I
O, TOT
0.0
0.0
0.0
—
—
—
4.0
4.0
5.0
Adc
Adc
Adc
Output Current-limit Inception
(V
O
= 90% of V
O , nom
)HW025AF
HW025FG I
O, cli
I
O, cli
—
——
—9
†
9
†
A
A
Output Short-circuit Current
(V
O
= 250 mV) All I
O, SL
— 1.0 —
Adc
Efficiency
f or V
01
= 5.0 V, V
02
= 3.3 V
(V
I
= 48 V, I
01
= I
02
= 2.5 A, T
ref
= 25 °C)
f or V
01
= 3.3 V, V
02
= 2.5 V
(V
I
= 48 V, I
01
= I
02
= 2.5 A, T
ref
= 25 °C)
HW025AF
HW025FG
η
η
82
80
85
83
—
—
%
%
Switching Frequency All — — 300 — kHz
4 Tyco Electronics Corp.
Data Sheet
November 2001
36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Electrical Specifications
(continued)
Table 2. Output Specifications
(continued)
Isolation Specifications
General Specifications
Solder Ball and Cleanliness Requirements
The open frame (no case or potting) po w er module will meet the solder ball requirements per J-STD-001B. These
requirements state that solder balls must neither be loose nor violate the po w er module minim um electrical spacing.
The cleanliness designator of the open frame power module is C00 (per J specification).
Solder, Cleaning and Drying Considerations
Post solder cleaning is usually the final circuit-board assembly process prior to electrical board testing. The result
of inadequate circuit-board cleaning and drying can affect both the reliability of a power module and the testability
of the finished circuit-board assembly. For guidance on appropriate soldering, cleaning, and drying procedures,
refer to the
Board-Mounted Power Modules Soldering and Cleaning
Application Note
(AP97-021EPS).
Parameter Device Symbol Min Typ Max Unit
Dynamic Response
(
∆
I
O
/
∆
t = 1 A/10 µs, V
I
= 48 V, T
ref
= 25 °C):
Load Change from IO1 = 50% to 75% of
I
O1
, max or I
O1
= 50% to 25% of IO1,
max; I
O2
= 30% of I
O2
, max:
Peak Deviation
Settling Time (V
O
< 10% of peak
deviation)
Load Change from IO2 = 50% to 75% of
I
O2
, max or I
O2
= 50% to 25% of I
O2
, max;
I
O1
= 30% of I
O1
, max:
Peak Deviation
Settling Time (V
O
< 10% of peak
deviation)
All
All
All
All
—
—
—
—
—
—
—
—
100
2000
100
2000
—
—
—
—
mV
µs
mV
µs
Parameter Min Typ Max Unit
Isolation Capacitance — 0.2 — nF
Isolation Resistance 10 — — M
Ω
Parameter Min Typ Max Unit
Calculated MTBF (I
O
= 80% of I
O, max
; T
A
= 20 °C)
HW025AF
HW025FG 4,000,000
4,900,000 hours
hours
Weight — — 23 (0.81) g (oz.)
Tyco Electronics Corp. 5
Data Sheet
November 2001 36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
Table 3. Feature Specifications
* A Minimum OFF Period of 1 sec is recommended.
Parameter Device Symbol Min Typ Max Unit
Remote On/Off Signal Interface*
(V
I
= 0 V to 75 V; open collector or equiv alent
compatible; signal referenced to V
I
(–)
terminal; see Figure 18. and Feature
Descriptions.):
HW025 Preferred Negative Logic:
Logic Low—Module On
Logic High—Module Off
HW025 Optional Positive Logic:
Logic Low—Module Off
Logic High—Module On
Logic Low:
At I
on/off
= 1.0 mA
At V
on/off
= 0.0 V
Logic High:
At I
on/off
= 0.0 µA
Leakage Current
Turn-on Time (I
O1
& I
O2
= 2.5A; V
O1
and V
O2
within ±1% of steady state;
see Figure 7/14.)
—
—
—
—
—
V
on/off
I
on/off
V
on/off
I
on/off
—
0
—
—
—
—
—
—
—
—
15
1.2
1.0
15
50
—
V
mA
V
µA
ms
Output Voltage Adjustment Range (trim), each
output:
Note:
There are restrictions to the
combinations of output voltage.
See Output Voltage Adjustment Section.
HW025AF
HW025FG
V
01
V
02
V
01
V
02
76
76
60
—
—
—
—
105
105
105
105
%V
%V
%V
%V
Output Overvoltage Protection
(Note: Only on V
O1
)HW025AF
HW025FG V
01
V
01
5.6
3.5 —
—7.0
4.0 V
V
Overtemperature Protection All T
ref — 120 — °C
6 Tyco Electronics Corp.
Data Sheet
November 2001
36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Characteristic Curves - AF
The following figures provide typical characteristics for the power modules. The figures are identical for both on/off
configurations.
8-3301 (F)
Figure 1. Typical HW025AF Input Characteristics at
Room Temperature
8-3289 (F)
Figure 2. T ypical HW025AF Converter Efficiency vs.
Output Current at VIN = 36V
8-3302 (F)
Figure 3. T ypical HW025AF Converter Efficiency vs.
Output Current at VIN = 48V
8-3303 (F)
Figure 4. T ypical HW025AF Converter Efficiency vs.
Output Current at VIN = 75V
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0 1020304050607080
INPUT VOLTAGE, V
IN
(V)
INPUT CURRENT, I
IN
(A)
IO1 = 4A, IO2 = 1A
IO1 = 1.5A, IO2 = 1.5A
IO1 = 0A, IO2 = 0A
50
55
60
65
70
75
80
85
90
0
1234
OUTPUT CURRENT, IO1 (A)
EFFICIENCY,
η (%)
IO2 = 0A
IO2 = 1A
IO2 =
2A
IO2
=
3A
IO2 = 4A
50
55
60
65
70
75
80
85
90
01234
OUTPUT CURRENT, I
O1
(A)
EFFICIENCY,
η
(%)
I
O2
= 0A
I
O2
= 1A
I
O2
= 2A
I
O2
= 3A
I
O2
= 4A
50
55
60
65
70
75
80
85
90
01234
OUTPUT CURRENT, I
O1
(A)
EFFICIENCY,
η
(%)
I
O2
= 0A
I
O2
= 1A
I
O2
= 2A
I
O2
= 3A
I
O2
= 4A
Data Sheet
November 2001
Tyco Electronics Corp. 7
36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Characteristic Curves - AF (continued)
8-3304 (F)
Figure 5. T ypical HW025AF Output Ripple V olta ge at
Room T emperature, VIN = 48V and IO1 = IO2
= 2.5A
8-3290 (F)
Figure 6. Typical HW025AF Transient response
to Step Load Change, IO1 = 50% to 25%
to 50% of IO, max (0.1A / µs ) at Room
Temperature and 48V Input (Waveform
Averaged to Eliminate Ripple
Component.)
8-3291 (F)
Figure 7. Typical Start-Up from Remote On/Off
HW025AF; IO1 = IO2 = 2.5A and VIN = 48V
TIME, t (2µs / div)
VO1
VO2
OUTPUT VOLTAGE, V O (V)
(50mV / div)
TIME, t (1ms / div)
VO1
VO2
IO1
OUTPUT VOLTAGE, VO
(V)
(20mV / div)
OUTPUT CURRENT, IO
(A)
(1A / div)
TIME, t (2ms / div)
V
ON/OFF
V
O1
V
O2
REMOTE ON/OFF,
VON/OFF (V)
OUTPUT VOLTAGE, VO (V)
(1V / div)
88 Tyco Electronics Corp.
Data Sheet
November 2001
36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Characteristic Curves - FG
8-3292 (F)
Figure 8. Typical HW025FG Input Characteristics
at Room Temperature
8-3308 (F)
Figure 9. T ypical HW025FG Con verter Efficiency vs.
Output Current at VIN = 36V
8-3293 (F)
Figure 10. Typical HW025FG Converter Efficiency
vs. Output Current at VIN = 48V
8-3310 (F)
Figure 11. Typical HW025FG Converter Efficiency
vs. Output Current at VIN = 75V
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0 1020304050607080
INPUT CURRENT, IIN (A)
INPUT VOLTAGE, VIN (V)
IO1 = 4A, IO2 = 1A
IO1 = 1.5A, IO2 = 1.5A
IO1 = 0A, IO2 = 0A
50
55
60
65
70
75
80
85
90
01234
OUTPUT CURRENT, I
O1
(A)
EFFICIENCY,
η
(%)
I
O2
= 0
A
I
O2
=
1A
I
O2
=
2A
I
O2
=
3A
I
O2
=
4A
50
55
60
65
70
75
80
85
90
01234
OUTPUT CURRENT, I
O1
(A)
EFFICIENCY,
η
(%)
I
O2
= 0A
I
O2
= 1A
I
O2
= 2A
I
O2
= 3A
I
O2
= 4A
50
55
60
65
70
75
80
85
90
01234
OUTPUT CURRENT, IO1 (A)
EFFICIENCY,
η (%)
IO2 = 0A
IO2 = 1A
IO2 = 2A
IO2 = 3A
IO2 = 4A
Tyco Electronics Corp. 9
Data Sheet
November 2001 36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Characteristic Curves- FG (continued)
8-3311 (F)
Figure 12. Typical HW025FG Output Ripple Voltage
at Room Temperature , VIN = 48V and
IO1 = IO2 = 2.5A
8-3401 (F)
Figure 13. Typical HW025FG Transient response to
Step Load Change, IO1 = 50% to 25% to
50% of IO, max (0.1A / µs ) at Room
Temperature and 48V Input (Waveform
Averaged to Eliminate Ripple
Component.)
8-3295 (F)
Figure 14. Typical Start-Up from Remote On/Off
HW025FG; IO1 = IO2 = 2.5A and VIN=48V
TIME, t (2µs / div)
VO1
VO2
OUTPUT VOLTAGE, VO (V)
(50mV / div)
TIME, t (1ms / div)
V
O1
V
O2
IO1
OUTPUT VOLTAGE, VO
(V)
(20mV / div)
OUTPUT CURRENT, IO(A)
(1A / div)
TIME, t (2ms / div)
VON/OFF
VO1
VO2
REMOTE ON/OFF,
VON/OFF
(V)
OUTPUT VOLTAGE, V
O (V)
(1V / div)
1010 Tyco Electronics Corp.
Data Sheet
November 2001
36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Test Configurations
8-2736 (F)
Note: Measure input reflected-ripple current with a simulated source
inductance (LTEST) of 12 µH. Capacitor CS offsets possible bat-
tery impedance. Measure current as shown above.
Figure 15. Input Reflected-Ripple Test Setup
8-3299 (F)
Note: Use a 1.0 µF ceramic capacitor and a 10 µF aluminum or
tantalum capacitor . Scope measurement should be made using
a BNC socket. Position the load between 51 mm and 76 mm
(2 in. and 3 in.) from the module.
Figure 16. Peak-to-P eak Output Noise Measurement
Test Setup
8-3300 (F)
Note: All measurements are taken at the module terminals. When
socketing, place Kelvin connections at module terminals to
avoid measurement errors due to socket contact resistance.
Figure 17. Output Voltage and Efficiency
Measurement Test Setup
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the power
module. For the test configuration in Figure 15,
a 33 µF electrolytic capacitor (ESR < 0.7 Ω at 100 kHz)
mounted close to the power module helps ensure
stability of the unit. For other highly inductive source
impedances, consult the factory for further application
guidelines.
Safety Considerations
For safety-agency approval of the system in which the
power module is used, the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standard,
i.e., UL 60950, CSA C22.2 No. 60950-00, VDE 0805
(EN60950).
If the input source is non-SELV (ELV or a hazardous
voltage greater than 60 Vdc and less than or equal to
75Vdc), for the module’s output to be considered as
meeting the requirements for safety extra-low voltage
(SELV), all of the following must be true:
■The input source is to be provided with reinforced
insulation from any other hazardous voltages,
including the ac mains.
■One VIN pin and one VOUT pin are to be grounded,
or both the input and output pins are to be kept
floating.
■The input pins of the module are not operator
accessible.
■Another SELV reliability test is conducted on the
whole system (combination of supply source and
subject module), as required by the safety agencies,
to v erify that under a single fault, hazardous voltages
do not appear at the module’s output.
Note: Do not ground either of the input pins of the
module without grounding one of the output pins .
This may allow a non-SELV voltage to appear
between the output pins and ground.
The pow er module has extra-low voltage (ELV) outputs
when all inputs are ELV.
The input to these units is to be provided with
a maximum 3 A normal-blow fuse in the
ungrounded lead.
VI(+)
VI(–)
CURRENT
PROBE
TO
OSCILLOSCOPE
LTEST
12 µH
BATTERY CS 220 µF
ESR < 0.1 Ω
@ 20 ºC 100 kHz
COPPER STRIPS
1.0 µF 10 µFSCOPE RLOAD1
VO1
1.0 µF 10 µFRLOAD2
VO2
COM
LOAD
CONTACT AND
SUPPLY II
CONTACT
VI(+)
VI(–)
COM
VO1
DISTRIBUTION LOSSES
RESISTANCE
IOLOAD
VO2
η
2
Σ
J1= V
OJ
(+)
V
COM
–
[]
I
OJ
V
I
(+)
–
V
I
(–)
[]
I
I
---------------------------------------------------------------------------
x
100 %=
Tyco Electronics Corp. 11
Data Sheet
November 2001 36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Feature Descriptions
Overcurrent Protection
To provide protection in a fault (output overload) condi-
tion, the unit is equipped with internal current-limiting
circuitry and can endure current limiting continuously.
At the point of current-limit inception, the unit enters
hiccup mode. The unit operates normally once the out-
put current is brought back into its specified r ange . The
average output current during hiccup is 10% I
O, max
.
Remote On/Off
Two remote on/off options are a vailable. Positive logic
turns the module on during a logic high v oltage on the
ON/OFF pin, and off during a logic low. Negativ e logic
turns the module off during a logic high and on during a
logic low. Negative logic , device code suffix "1", is the
f actory-preferred configur ation.
To turn the power module on and off , the user m ust sup-
ply a s witch (open collector or equivalent) to control the
v oltage (V
on/off
)
between the ON/OFF terminal and the
V
IN
(-) terminal (see Figure 18).
Logic low is 0V
≤
V
on/off
≤
1.2V. The maximum I
on/off
during a logic low is 1mA, the s witch should be maintain
a logic low level whilst sinking this current.
During a logic high, the maximum V
on/off
generated b y
the module is 15V, and the maximum allowable leakage
current at V
on/off
= 15V is 50µA.
If not using the remote on/off f eature:
■
F or negativ e logic , short the ON/OFF pin to V
IN
(-)..
■
For positive logic, leave ON/OFF pin open.
8-2800 (F)
Figure 18. Remote On/Off Implementation
Output Voltage Set-Point Adjustment (Trim)
Trimming allows the output voltage set point to be
increased or decreased, this is accomplished by
connecting an external resistor between the TRIM pin
and either the VO(+) pin or the COM pin (see Figure 19).
8-2739 (F)
Figure 19. Circuit Configuration to Trim
Output V oltage
Connecting an e xternal resistor (R
trim-down
) between the
TRIM pin of the desired output and the COM pin
decreases the output v oltage set point. To maintain set
point accuracy, the trim resistor tolerance should be
±0.1%.
The relationship between the output v oltage and the trim
resistor v alue for a
∆
% reduction in output v oltage is:
See Figures 20 & 21.
Connecting an e xternal resistor (R
trim-up
) between the
TRIM pin and the V
O
(+) pin of the desired output
increases the output v oltage set point.
F or trim-up:
(V
Ox
ref ers to the nominal output voltage, i.e . 5.0V f or V
O1
on an AF)
See Figures 22 & 23.
VO
(+)
V
O
TRIM
COM
R
trim-down
LOAD
V
IN(+)
ON/OFF
VIN(-)
Rtrim-up
VO1 Rtrim-down = - 6.11 kΩ
511
∆%
VO2 Rtrim-down = - 1.33 kΩ
100
∆%
ON/OFF
VIN(+)
VIN(-)
Ion/off
Von/off
VO1
COM
VO2
VO1 Rtrim-up = - - 6.11 kΩ
5.11VO1(100+∆%)
1.225∆%
511
∆%
VO2 Rtrim-up = - - 1.33 kΩ
VO2(100+∆%)
1.225∆%
100
∆%
1212 Tyco Electronics Corp.
Data Sheet
November 2001
36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Feature Descriptions
(continued)
If not using the trim feature , leave the TRIM pin(s)
unconnected.
Note:
The f ollowing v oltage r ange restrictions apply.
HW025AF
For V
O1
set to 5.0V – V
O2
range is 2.5V to 3.3V
HW025FG
For V
O1
set to 3.3V – V
O2
range is 1.5V to 2.5V
For V
O1
set to 2.5V – V
O2
range is 1.5V to 2.0V
8-2680 (F)
Figure 20.Resistor Selection for Decreased
Output V oltage for V
O1
(AF and FG)
8-2681 (F)
Figure 21. Resistor Selection for Decreased
Output V oltage for V
O2
(AF and FG)
8-3093 (F)
Figure 22. Resistor Selection for Increased
Output V oltage on V
O1
8-3094 (F)
Figure 23. Resistor Selection for Increased
Output V oltage on V
O1
0
2
4
6
8
10
12
14
16
18
20
510152025
% CHANGE IN OUTPUT VOLTAGE (∆%)
ADJUSTMENT RESISTOR VALUE (k
Ω)
0
200
400
600
800
1000
1200
1400
1600
1800
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
% CHANGE IN OUTPUT VOLTAGE (∆%)
ADJUSTMENT RESISTOR VALUE (k
Ω)
AF
F
G
0
20
40
60
80
100
120
140
160
180
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
% CHANGE IN OUTPUT VOLTAGE (∆%)
ADJUSTMENT RESISTOR VALUE (k
Ω)
AF
FG
0
10
20
30
40
50
60
70
80
90
100
510152025
% CHANGE IN OUTPUT VOLTAGE (∆%)
ADJUSTMENT RESISTOR VALUE (k
Ω)
Tyco Electronics Corp. 13
Data Sheet
November 2001 36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Feature Descriptions
(continued)
Output Overvoltage Protection
The output overvoltage protection consists of circuitry
that monitors V
O1
. If the voltage at the terminals
exceeds the overvoltage threshold, then the module
will shutdown and attempt to restart.
Thermal Considerations
Heat is removed by convection and radiation to the
surrounding environment, sufficient cooling should be
provided to ensure reliable operation of the unit.
Considerations include ambient temperature, airflow,
module power dissipation, and need for increased
reliability.
The thermal reference point, T
ref
, used in the specifica-
tions is shown in Figure 24
8-3402 (F).a
Figure 24. T
ref
Temperature Measurement Location
8-3094 (F)
Figure 25. Typical Maximum Total Output Current
vs. Local Ambient Temperature
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit will
shutdown if the o vertemperature threshold is exceeded
it will then wait for the unit to cool before attempting
to restart.
EMC Considerations
Figure 26. Suggested Configuration for EN55022
Class B
For assistance with designing for EMC compliance,
please refer to the FLTR100V10 data sheet
(FDS01-043EPS).
Layout Considerations
Copper paths must not be routed beneath the power
module mounting inserts. For additional layout
guide-lines, refer to FLTR100V10 data sheet
(FDS01-043EPS).
PIN 2
PIN 1
PIN 8
PIN 7
PIN 6
PIN 5
PIN 9
PIN 3
PIN 4
Q14
THERMOCOUPLE
LOCATION
Q14 (Tref)
0.1 m/s (20 ft./min.)
1.0 m/s (200 ft./min.)
2.0 m/s (400 ft./min.)
3.0 m/s (600 ft./min.)
LOCAL AMBIENT TEMPERATURE, TA (oC)
TOTAL OUTPUT CURRENT, I O, TOT
(A)
HW025
VI(+)
VI(-)
VO1
COM
VO2
100nF CERAMIC
33µF
100V
3.3mH COMMON-
MODE CHOKE
2x0.47µF
100V
1414 Tyco Electronics Corp.
Data Sheet
November 2001
36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Table 4. Pin Functions
Pin Function Pin Function
1V
I(+)6 VO2
2 REMOTE ON/OFF 7 COM
3 Not Connected 8 VO1
4VI(–)9VO1TRIM
5V
O2TRIM
Outline Diagram
Dimensions are in millimeters and (inches)
Tolerences: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.)
Tyco Electronics Corp. 15
Data Sheet
November 2001 36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
Ordering Information
For assistance in ordering, please contact your Tyco Electronics Power Systems’ Account Manager or
Field Application Engineer for pricing and availability.
Feature Specifications
Input V oltage Output
Voltage Remote On/
Off Logic Basic
Isolation Surface
mount Device Code Comcode
48V 5.0V
3.3V
Negative
- - HW025AF1
✓
- HW025AF1-B
-
✓
HW025AF1-S
✓✓
HW025AF1-BS
Positive
- - HW025AF 108776774
✓
- HW025AF-B
-
✓
HW025AF-S
✓✓
HW025AF1-BS
48V 3.3V
2.5V
Negative
- - HW025FG1
✓
- HW025FG1-B
-
✓
HW025FG1-S
✓✓
HW025FG1-BS
Positive
- - HW025FG 108573023
✓
- HW025FG-B
-
✓
HW025FG-S 108869926
✓✓
HW025FG-BS
Data Sheet
November 2001
36 Vdc to 75 Vdc Input, Dual Positive Outputs; 25W
HW025 Dual Positive Output-Series Power Modules: dc-dc Converters:
W orld Wide Headquarters
Tyco Electronics Power Systems, Inc.
3000 Skyline Drive, Mesquite, TX 75149, USA
Tel: +1-800-526-7819, Fax: +1-888-315-5182
(Outside U.S.A.: +1-972-284-2626, Fax: +1-972-284-2900)
http://power.tycoelectronics.com
Tyco Electronics Corporation reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.
No rights under any patent accompany the sale of any such product(s) or information.
© 2001 Tyco Electronics Power Systems, Inc., (Mesquite, Texas) All International Rights Reserved.
NOV 2001
FDS01-027EPS (Replaces DS99-344EPS)
Europe, Middle-East and Africa Headquarters
Tyco Electronics (UK) Ltd
Tel: +44 (0) 1344 469 300, Fax: +44 (0) 1344 469 301
Central America-Latin America Headquarters
Tyco Electronics Power Systems
Tel: +54 11 4316 2866, Fax: +54 11 4312 9508
Asia-Pacific Headquarters
Tyco Electronics Singapore Pte Ltd
Tel: +65 482 0311, Fax: +65 480 9299