Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 1 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
AEO40x48 / ALO40x48 Single Output 8th Brick: Baseplate or Open-Frame Module
The AEO40x48 / ALO40x48 series is Astec’s High Current 8th Brick industry standard offering. Operating from an input
voltage range of 36V to 75V, the series provides 7 configured outputs starting from 1.2V all the way up to 12V. It delivers up
to 40A max current for 1.8V and lower at impressive levels of efficiency. It provides tight regulation and exhibits clean and
monotonic output start up characteristics. The AEO_ALO series comes with industry standard features such as Input UVLO;
non-latching OCP, OVP and OTP; Output Trim; Differential Remote Sense pins. Both baseplate (AEO) and open frame (ALO)
construction are available as well as TH or SMT termination. With its wide operating temperature range of -40°C to 85°C
ambient, the converters are deployable into almost any environment.
Special Features
• Industry Standard 8th Brick Footprint
• Baseplate or Open frame construction
• Low Ripple and Noise
• Regulation to zero load
• High Capacitive Load Start-up
• Fixed Switching Frequency
• Industry standard features: Input UVLO;
Enable; non-latching OVP, OCP and OTP;
Output Trim, Differential Remote Sense
• Meets Basic Insulation
Environmental Specifications
• -40ºC to 85ºC Operating Temperature
• -40ºC to 125ºC Storage Temperature
• MTBF > 1 million hours
Electrical Parameters
Input
Input Range 36-75 VDC
Input Surge 100V / 100ms
Control
Enable TTL compatible
(Positive or Negative Logic Enable Options)
Output
Load Current Up to 40A max (VO ≤ 1.8V)
Line/Load Regulation < 1% VO
Ripple and Noise 15mVP-P typical at 1.8V
Output Voltage
Adjust Range ±10% VO
Transient Response 2% Typical deviation
50% to 75% Load Change
20µs settling time (Typ)
Remote Sense +10%VO
Over Current 120% max
Protection
Over Voltage 130% max
Protection
Over Temperature 110 °C
Protection
Safety
UL + cUL 60950, Recognized
EN60950 through TUV-PS
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 2 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Electrical Specifications
ABSOLUTE MAXIMUM RATINGS
Stresses in excess of the absolute maximum ratings can cause permanent damage to the converter. Functional
operation of the device is converter is not implied at these or any other conditions in excess of those given in the
operational section of the specs. Exposure to absolute maximum ratings for extended period can adversely affect
device reliability.
Parameter Device Symbol Min Typical Max Unit
Input Voltage
Continuous
Transient (100ms)
All
Vin
Vin trans
-0.3
-
-
-
75
100
Vdc
I/O Isolation
Input-to-Output
All
-
1500
-
-
Vdc
Operating Temperature1 All TA -40 - 85 ºC
Storage Temperature All TSTG -55 - 125 ºC
Operating Humidity All - 10 - 85 %
Max Voltage at Enable Pin All -0.6 - 25 Vdc
Max Output Power B (12V0) PO,MAX - - 120.0 W
A (5V0) - - 100.0
F (3V3) - - 99.0
G (2V5) - - 88.0
Y (1V8) - - 72.0
M (1V5) - - 60.0
K (1V2) - - 48.0
INPUT SPECIFICATION
Parameter Device Symbol Min Typical Max Unit
Operating Input Voltage Range All VIN 36 48 75 Vdc
Input Under-Voltage Lock-out
T_ON Threshold
T_OFF Threshold
All
33
31
34
32
36
34
Vdc
Max Input Current2
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2)
Iinmax -
-
-
-
-
-
-
-
-
-
-
-
TBA
3.5
3.5
3.3
TBA
TBA
TBA
A
Standing Loss
All - - 4 W
Input Ripple Current3
All II1 - 10 30 mAp-p
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 3 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Electrical Specifications (continued)
OUTPUT SPECIFICATIONS
Parameter Device Symbol Min Typical Max Unit
Output Voltage Set point
VIN = VIN,MIN to VIN,MAX
IO = IO,MAX
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2)
VO,SET 11.80
4.90
3.25
2.45
1.76
1.47
1.17
12.00
5.00
3.30
2.50
1.80
1.50
1.20
12.20
5.10
3.35
2.55
1.84
1.53
1.23
Vdc
Output Regulation
Line
VIN = VIN,MIN to VIN,MAX
Load
VIN = VIN,NOM
IO = IO,MIN to IO,MAX
Temp
VIN = VIN,NOM; IO = IO,MAX4
All
-
-
-
-
-
-
0.1
0.1
0.5
0.2
0.5
1.0
%
Output Ripple and Noise5
Peak-to-Peak
IO = IO,MAX; VIN =VIN,NOM;
BWL = 20 MHz; TA =25 oC
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2))
-
-
-
-
-
-
-
-
50
40
40
20
15
15
15
120
90
75
75
50
50
50
mVp-p
Output Current6
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2)
IO 0
0
0
0
0
0
0
-
-
-
-
-
-
-
10
20
30
35
40
40
40
A
Output Current-limit Inception
VO = 90% VO,NOM; TA = 25 ºC
VIN = VIN,NOM
Non-latching / auto-recovery
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2)
IO,OCP 11.5
24.0
33.0
42.0
46.0
46.0
46.0
-
-
-
-
-
-
-
17.0
32.0
41.5
47.0
60.0
60.0
60.0
A
External Load Capacitance
IO = IO,MAX , resistive load
ESR
All
B (12V0)
A (5V0)
F (3V3)
CEXT -
-
-
-
4
-
-
-
-
-
20,000
2000
10,000
10,000
-
µF
mΩ
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 4 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Electrical Specifications (continued)
OUTPUT SPECIFICATIONS
Parameter Device Symbol Min Typical Max Unit
Efficiency
VIN = VIN,NOM; IO = IO,MAX
TA = 25 ºC;
B (12V)
A (5.0V)
F (3.3V)
G (2.5V)
Y (1.8V)
M (1.5V)
K (1.2V)
η
η
η
η
η
η
η
91
92
90
89
87
85
84
92
93
91
90
88
86
85
93
94
93
92
89
87
86
%
Output Over Voltage Protection
Non-latching / autorecovery B (12V)
A (5.0V)
F (3.3V)
G (2.5V)
Y (1.8V)
M (1.5V)
K (1.2V)
VO,OVP 13.8
5.8
3.8
2.9
2.1
1.8
1.4
14.4
6.0
4.0
3.0
2.2
1.9
1.5
15.0
6.2
4.3
3.2
2.4
2.0
1.6
V
Over Temperature Protection
Autorecovery
AEO
ALO
110
110
-
-
120
120
°C
Input to Output Turn-On Delay
VIN = VIN,NOM, IO = IO,MAX All
5V, 12V - -
- -
- 17
20 ms
Enable to Output Turn-On Delay
VIN = VIN,NOM, IO = IO,MAX All
5V, 12V - - -
- 17
20 ms
Output Voltage Rise Time
10% to 90% of VO,NOM
VIN = VIN,NOM, IO = IO,MAX
All
5V
12V
-
-
-
-
-
-
3.0
4.0
9.0
9.0
11.0
16.0
ms
Switching Frequency All FSW 380 450 520 kHz
Output Voltage Remote Sensing All - - - 10 %VO
Output Voltage Trim Range7 All 90 110 %VO
Output Voltage Overshoot All - - 0 3 %Vo
Dynamic Response
di/dt = 0.1 A/µs
Peak Deviation
∆IO = 50% to 75% of Iomax
Settling Time
Vref = Vonom
Peak Deviation
∆IO = 50% to 25% of Iomax
Settling Time
Vref = Vonom
All
All
All
All
-
-
-
-
-
-
-
-
2
20
2
20
5
100
5
100
%
µs
%
µs
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 5 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Electrical Specifications (continued)
OUTPUT SPECIFICATIONS
Parameter Device Symbol Min Typical Max Unit
Output Enable ON/OFF
Open collector TTL compatible
Positive Enable: Mod-ON
Mod-OFF
Negative Enable: Mod-ON
Mod-OFF
All
All
All
All
-
-
-
-
2.95
-0.50
-0.50
2.95
-
-
-
-
20
1.20
1.20
20
V
V
V
V
Note: 1. Derating curves for both openframe and baseplate modules are based on derated component junction
temperatures of 120oC or less where applicable.
2. An input line fuse is recommended for use (e.g. Little Fuse Type 314 - 6A max, 250V min).
3. External input capacitance required. See Input Ripple Current test measurement setup on Fig 1.
4. Max output current should meet the appropriate derating curves.
5. Refer to Fig 2 for output ripple measurement setup.
6. Appropriate Thermal Derating applies.
7. Refer to the output trim equations provided (Equation 1 and 2).
SAFETY AGENCY / MATERIAL RATING / ISOLATION
Parameter Device
Safety Approval8 All UL/cUL 60950, 35d Edition – Recognized (PENDING)
EN 60950 through TUV (PENDING)
Material Flammability Rating All UL94V-0
Parameter Device Symbol Min Typical Max Unit
Input to Output Capacitance All - 1000 - pF
Input to output Resistance All - TBD - Ohms
Input to Output Insulation Type All - Basic - -
Note: 8. Safety approval for 3.3V version is complete.
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 6 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Electrical Specifications (continued)
Figure 2. Peak to Peak Output Noise Measurement Setup.
Figure 1. Input Reflected Ripple Current Measurement Setup.
Vo(+)
Vo(-)
RESISTIVE
LOAD
10 uF
0.1 uF
SCOPE
COPPER STRIP
Use a 0.1
µ
F @50V X7R ceramic capacitor (connected an inch away from the output
terminals of the UUT) and a 10µ
F @ 25V tantalum capacitor (2 inches away from
the output terminals of the UUT). Scope measurement should be made using a BNC
socket, positioned 3 inches away from output terminals of the converter.
BATTERY Cs 220 uF
ESR < 0.1 OHM
@ 20 ºC, 100 kHz
Ltest
12 uH
33 uF
ESR < 0.7 OHM
@ 20 ºC, 100 kHz
Vi(+)
Vi(-)
TO OSCILLOSCOPE
Measure input reflected
-
ripple current with a simulated source inductance (Ltest) o
f
12 uH. Capacitor Cs offsets possible battery impedance. Measure current as shown
above.
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 7 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
+Vin
-Vin
Enable
-Vout
+Vout
-Sense
+Sense
Vadj
Rload
Radj_up
Figure 3. External resistor configuration to increase the outputs
+Vin
-Vin
Enable
-Vout
+Vout
-Sense
+Sense
Vadj Rload
Radj_down
Figure 4. External resistor configuration to increase the outputs
Basic Operation and Features
INPUT UNDER VOLTAGE LOCKOUT
To prevent any instability to the converter, which may affect the end system, the converter have been designed to turn-on once
VIN is in the voltage range of 33-36 VDC. Likewise, it has also been programmed to turn-off when VIN drops down to 31-34
VDC.
OUTPUT VOLTAGE ADJUST/TRIM
The converter comes with a TRIM pin (PIN 6), which is used to adjust the output by as much as 90% to 110% of its set point.
This is achieved by connecting an external resistor as described below.
To INCREASE the output, external Radj_up resistor
should be connected between TRIM PIN (Pin6) and
+SENSE PIN (Pin 7). Please refer to Equation (1) for the
required external resistance and output adjust
relationship.
Equation (1a): 1.5V to 12V
Equation (1b): 1.2V
To DECREASE the output, external Radj_down resistor
should be connected between TRIM pin (Pin 6) and
-SENSE PIN (Pin 5). Please refer to Equation (2) for the
required external resistance and output adjust
relationship.
Equation (2):
Where: ∆% = percent change in output voltage
Radj_down 510
∆%10.2−
kΩ⋅
Radj_up
5.1 Voset
×100 ∆%+
()
×
0.6 ∆%×
510
∆%
−10.2−
=ΚΩ
Radj_up
5.1 Voset
×100 ∆%+
()
×
1.225 ∆%×
510
∆%
−10.2−
=ΚΩ
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 8 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Basic Operation and Features (continued)
OUTPUT ENABLE
The converter comes with an Enable pin (PIN 2), which is primarily used to turn ON/OFF the converter. Both a Positive (no
“N” suffix required) and a Negative (suffix “N” required) Enable Logic options are being offered. Please refer to Table 2 for
the Part Numbering Scheme.
For Positive Enable, the converter is turned on when the Enable pin is at logic HIGH or left open. The unit turns off when the
Enable pin is at logic LOW or directly connected to -VIN. On the other hand, the Negative Enable version turns unit on when
the Enable pin is at logic LOW or directly connected to -VIN. The unit turns off when the Enable pin is at Logic HIGH.
OUTPUT OVER VOLTAGE PROTECTION (OVP)
The Over Voltage Protection circuit is non-latching - auto recovery mode. The output of the converter is terminated under an
OVP fault condition (Vo > OVP threshold). The converter will attempt to restart until the fault is removed. There is a 100ms
lockout period between restart attempts.
OVER CURRENT PROTECTION (OCP)
The Over Current Protection is non-latching - auto recovery mode. The converter shuts down once the output current reaches
the OCP range. The converter will attempt to restart until the fault is removed. There is a 100ms lockout period between restart
attempts.
OVER TEMPERATURE PROTECTION (OTP)
The Over Temperature Protection circuit will shutdown the converter once the average PCB temperature (See Figure 90B for
OTP reference sense point) reaches the OTP range. This feature prevents the unit from overheating and consequently going
into thermal runaway, which may further damage the converter and the end system. Such overheating may be an effect of
operation outside the given power thermal derating conditions. Restart is possible once the temperature of the sensed location
drops to less than 110°C.
REMOTE SENSE
The remote sense pins can be used to compensate for any voltage drops (per indicated max limits) that may occur along the
connection between the output pins to the load. Pin 7 (+Sense) and Pin 5 (-Sense) should be connected to Pin 8 (+Vout) and
Pin 4 (Return) respectively at the point where regulation is desired. The combination of remote sense and trim adjust cannot
exceed 110% of VO. When output voltage is trimmed up (through remote sensing and/or trim pin), output current must be
derated and maximum output power must not be exceeded.
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 9 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Performance Curves
3.3V @ 30A
Efficiency vs. Output Current TA=25°C
50%
55%
60%
65%
70%
75%
80%
85%
90%
95%
0 5 10 15 20 25 30
Output Current (Amps)
Efficiency
Vin = 36Vdc
Vin = 48Vdc
Vin = 75Vdc
0
2
4
6
8
10
12
14
0 5 10 15 20 25 30
Output Current (Amps)
Power Dissipation (Watts)
Vin = 36Vdc
Vin = 48Vdc
Vin = 75Vdc
Power Dissipation vs. Output Current, TA=25°C
Efficiency vs. Output Current, TA=85°C
50%
55%
60%
65%
70%
75%
80%
85%
90%
95%
0 5 10 15 20 25 30
Output Current (Amps)
Efficiency
Vin = 36Vdc
Vin = 48Vdc
Vin = 75Vdc
Power Dissipation vs. Output Current, TA=85°C
0
2
4
6
8
10
12
14
0 5 10 15 20 25 30
Output Current (Amps)
power Dissipation (Watts)
Vin = 36Vdc
Vin = 48Vdc
Vin = 75Vdc
Figure 6.
Efficiency vs. Load Current at minimum, nominal
and high line, TA = 25°C.
Figure 7. Power Dissipation vs. Load Current at minimum,
nominal and high line, TA = 25°C.
Figure 8. Efficiency vs. Load Current at minimum, nominal
and high line, TA = 85°C.
Figure 9.
Power Dissipation vs. Load Current at minimum,
nominal and high line, TA = 85°C.
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 10 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Performance Curves
3.3V @ 30A (continued)
Figure 12. 3.3V output transient respo
nse 25% to 50% step
change at VIN = 48Vdc, TA = 25 °C, CO = 0.
Figure 13. 3.3V output transient response 50% to 75% step
change at VIN = 48Vdc, TA = 25 °C, CO = 0.
Figure 11. 3.3V output ripple at V
IN
= 48Vdc, I
O
= Full Load,
TA = 25 °C.
Figure 10. 3.3V output startup characteristic at V
IN
= 48Vdc,
IO = Full Load, TA = 25 °C, CO = 0.
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 11 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Performance Curves
3.3V @ 30A (continued)
ALO30F48 Current vs. Temperature
0
5
10
15
20
25
30
25 40 55 70 85
Ambient Temperature [°C]
Current [A]
0 LFM (0 m/s)
100 LFM (0.5m/s)
200 LFM (1 m/s)
400 LFM (2 m/s)
AEO30F48 Current vs. Temperature
0
5
10
15
20
25
30
25 40 55 70 85
Ambient Temperature [°C]
Current [A]
0 LFM (0 m/s)
100 LFM (0.5m/s)
200 LFM (1 m/s)
400 LFM (2 m/s)
Output Frequency Spectrum, 0 - 1MHz
-1.00E+02
-8.00E+01
-6.00E+01
-4.00E+01
-2.00E+01
0.00E+00
0.0E+00
2.0E+05
4.0E+05
6.0E+05
8.0E+05
1.0E+06
Frequency (Hz)
dBm
480kHz 960kHz
ALO30F48 Conducted EMI
0
10
20
30
40
50
60
70
80
90
100
1.5E+05
2.4E+05
3.8E+05
6.0E+05
9.6E+05
1.5E+06
2.4E+06
3.9E+06
6.2E+06
9.8E+06
1.6E+07
2.5E+07
Frequency
db/uV
Figure 14. Output
Current vs. Temperature for open frame
version at V
IN = 48Vdc (TJ ≤120°C).
Figure 15. Output Current vs. Temperature for baseplate
version at V
IN = 48Vdc (TJ ≤120°C).
Figure 16. Typical output frequency spectrum at V
IN
=
48Vdc, IO = 100% Load, COUT = 0.
Figure 17. 3.3V Open frame Conducted EMI per Filter
defined in Fig 28. VIN = 48Vdc, IO = 100% Resistive Load,
CIN =220uF, COUT = 4700uF, TA = 25°C.
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 12 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Performance Curves
5V @ 20A
Efficiency vs. Output Current, TA=25°C
50%
55%
60%
65%
70%
75%
80%
85%
90%
95%
0 4 8 12 16 20
Output Current (Amps)
Efficiency
Vin = 36Vdc
Vin = 48Vdc
Vin = 75Vdc
Power Dissipation vs. Output Current, TA=25°C
0
2
4
6
8
10
0 5 10 15 20
Output Current (Amps)
Power Dissipation [W]
Vin = 36Vdc
Vin = 48Vdc
Vin = 75Vdc
Efficiency vs. Output Current, TA = 85°C
50%
55%
60%
65%
70%
75%
80%
85%
90%
95%
0 4 8 12 16 20
Output Current (Amps)
Efficiency
Vin = 36Vdc
Vin = 48Vdc
Vin = 75Vdc
Power Dissipation vs. Output Current, TA=85°C
0
2
4
6
8
10
0 5 10 15 20
Output Current (Amps)
Power Dissipation (W)
Vin = 36Vdc
Vin = 48Vdc
Vin = 75Vdc
Figure 18. Efficiency vs. Load Current a
t minimum, nom
and high line, TA = 25°C.
Figure 19. Power Dissipation vs. Load Current at min,
nominal and high line, TA = 25°C.
Figure 20. Efficiency vs. Load Current at minimum, nom
and high line, TA = 85°C.
Figure 21. Power Dissipation vs. Load Current at minimum,
nominal and high line, TA = 85°C.
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 13 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Performance Curves
5V @ 20A (continued)
Figure 23. 5V output ripple at V
IN
= 4
8Vdc, I
O
= Full Load,
TA = 25 °C.
Figure 22. 5V output startup characteristic at V
IN
= 48Vdc, I
O
= Full Load, TA = 25 °C, CO = 0.
Figure 24. 5V output transient response 25% to 50% step
change at VIN = 48Vdc, TA = 25 °C, CO = 0.
Figure 25. 5V output transient response 50% to 75% step
change at VIN = 48Vdc, TA = 25 °C, CO = 0.
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 14 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Performance Curves
5V @ 20A (continued)
ALO20A48 Current vs. Temperature
0
5
10
15
20
25 40 55 70 85
Temperature (°C)
Output Current (Amps)
0 LFM (0 m/s)
100 LFM (0.5m/s)
200 LFM (1 m/s)
400 LFM (3 m/s)
ALO20A48 Conducted EMI
0
10
20
30
40
50
60
70
80
90
100
1.5E+05
2.4E+05
3.8E+05
6.0E+05
9.6E+05
1.5E+06
2.4E+06
3.9E+06
6.1E+06
9.7E+06
1.5E+07
2.5E+07
Frequency
db/uV
TBA
Figure 26. Output Current vs. Temperature for open frame
version at V
IN = 48Vdc (TJ ≤120°C).
Figure 27. Output Current vs. Temperature for bas
eplate
version at V
IN = 48Vdc (TJ ≤120°C).
Figure 28. Typical output frequency spectrum (0
–
500kHz)
at VIN = 48Vdc, IO = 50% Load, COUT = 0.
Figure 29. 5V Open frame Conducted EMI per Filter
defined in Fig 28. VIN = 48Vdc, IO = 50% Resistive Load,
TA = 25°C.
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 15 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Input Filter for FCC Class B Conducted Noise
A reference design for an input filter that can provide FCC Class B conducted noise levels is shown below (See Figure 89).
Two common mode connected inductors are used in the circuit along with balanced bypass capacitors to shunt common mode
currents into the ground plane. Shunting noise current back to the converter reduces the amount of energy reaching the input
LISN for measurement.
The application circuit shown has an earth ground (frame ground) connected to the converter output (-) terminal. Such a
configuration is common practice to accommodate safety agency requirements. Grounding an output terminal results in much
higher conducted emissions as measured at the input LISN because a hard path for common mode current back to the LISN is
created by the frame ground. “Floating” loads generally result in much lower measured emissions. The electrical equivalent of
a floating load, for EMI measurement purposes, can be created by grounding the converter output (load) through a suitably
sized inductor(s) while maintaining the necessary safety bonding.
Figure 89: Class B Filter Circuit
PARTS LIST
CKT CODE DESCRIPTION
Inductor CTX01-15091
Cooper Electronic
Technologies
X-Cap 0.47 µF X 4pcs
Y-Cap 22 nF X 4 pcs
FILTER
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 16 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Mechanical Specifications
Parameter Device Symbol Min Typ Max Unit
Dimension All L - 2.30 [58.42] - in [ mm ]
W - 1.48 [37.59] - in [ mm ]
AEO
ALO H
H -
- -
- 0.40 [10.1]
0.32 [8.2] in [ mm ]
Weight AEO - 34.02 [1.2] - g [oz]
ALO - 22.68 [0.8] - g [oz]
PIN ASSIGNMENT
1 +VIN 5 -SENSE
2 ENABLE 6 TRIM
3 -VIN 7 +SENSE
4 -Vo 8 +Vo
Figure 90A. ALO (Openframe) Mechanical outline.
0.90
[22.9]
2.30
[58.4]
PIN SIDE DOWN
- Vin
+Vin
E-Sense
Trim
+Sense
-Output
+Output
0.32
[8.2]
2.00
[50.8]
0.15
[3.8]0.30
[7.6]
0.45
[11.4] 0.60
[15.2] 0.75
[19.0]
0.15
[3.8]
0.45
[11.4]
0.75
[19.0]
PIN SIDE DOWN
2.30
[58.4]
E
- Vin
+Vin
-Sense
Trim
+Sense
-Output
+Output
0.90
[22.9]
0.31
[7.9]
0.15
[3.9]
0.75
[19.1]
2.19
[55.5]
0.15
[3.8]0.30
[7.6]
0.45
[11.4] 0.60
[15.2] 0.75
[19.1]
0.15
[3.8]
0.45
[11.4]
THRU-HOLE SURFACE MOUNT
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 17 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
Mechanical Specifications
0.90
[22.9]
2.30
[58.4]
0.40
[10.1]
0.23
[5.8]
0.15
[3.8] 0.30
[7.6]
0.45
[11.4] 0.60
[15.2] 0.75
[19.0]
0.15
[3.8]
0.45
[11.4]
0.75
[19.0]
PIN SIDE DOWN
2.00
[50.8]
E
+Vin
- Vin
+Output
-Output
+Sense
Trim
-Sense
E
- Vin
+Vin +Output
-Output
+Sense
Trim
-Sense
0.90
[22.9]
PIN SIDE DOWN
2.30
[58.4]
0.15
[3.8] 0.30
[7.6]
0.45
[11.4] 0.60
[15.2] 0.75
[19.1]
0.15
[3.8]
0.45
[11.4]
0.75
[19.1]
2.19
[55.5]
0.39
[9.8]
0.15
[3.9]
THRU-HOLE SURFACE MOUNT
0.124 [3.15]
0.092 [2.34]
Min: 0.080 X 0.112 [2.03 x 2.84 ]
Max: 0.092 X 0.124 [2.34 x 3.15 ]
MECHANICAL TOLERANCE ± .002(0.5)
ALL DIMENSIONS ARE IN INCHES (MILLIMETERS)
RECOMMENDED SURFACE MOUNT PADS
NOTES:
0.30 [7.6]
0.15 [3.8]
0.15 [3.8]
0.15 [3.8]
0.15 [3.8]
0.90 [22.9]
0.30 [7.6]
0.30 [7.6]
L
C
2.30 [58.4]
2.19 [55.7]
0.30 [7.6]
Figure 91. Recommended Pad layout for SMT (Suffix “S”) version.
OTP Reference Sense
Points: Vicinity of Pin
2
-
Enable Pin
Figure 90B. AEO (Baseplate) Mechanical Outline.
Technical Reference Notes
AEO40x48 / ALO40x48 Series
(Single Output 8th Brick)
MODEL: AEO40x48 / ALO40x48 SERIES SHEET 18 OF 18
JANUARY 13, 2005 - REVISION A2 (PRELIMINARY)
RECOMMENDED REFLOW PROFILE
0
20
40
60
80
100
120
140
160
180
200
220
240
030 60 90 120 150 180 210 240 270 300
TIME (seconds)
TEMPERATURE (deg C)
SOLDERING CONSIDERATIONS
The AEO (baseplate) series converters are compatible
with standard wave soldering techniques. When wave
soldering, the converter pins should be preheated for
20-3o sec at 110°C and wave soldered at 260°C for
less than 10 sec.
When hand soldering, the iron temperature should be
maintained at 425°C and applied to the converter pins
for less than 5 seconds. Longer exposure can cause
internal damage to the converter. Cleaning can be
performed with cleaning solvent IPA or with water.
For SMT terminated modules, refer to Figure 92 for
the recommended reflow profile.
TABLE 2: PART NUMBERING SCHEME
CONSTRUCTION O/P CURRENT O/P VOLTAGE Vin Enable TH PIN
LENGTH TERMINATION
A W O xx y 48 N - 6 S
L = Open frame
E = Baseplate 10 = 10A
20 = 20A
30 = 30A
35 = 35A
40 = 40A
40 = 40A
40 = 40A
B = 12V
A = 5.0V
F = 3.3V
G = 2.5V
Y = 1.8V
M = 1.5V
K = 1.2V
N = Negative
Blank = Positive 6 = 3.7mm
blank = 5mm
default
S = SMT Termination
(option exists for 30A
and below)
Blank = (TH) thru-hole
Note: 1) For Through Hole termination: - Std pin length is 5mm nominal (min: 0.189 [4.8]; max: 0.205 [5.2] / in [mm])
- “-6” option is 3.7mm nominal (min: 0.137 [3.5]; max: 0.152 [3.9] / in [mm])
- Pins 4&8 diameter: ∅ = 0.062 [1.57], others: ∅ = 0.04 [1.0] (6X)
Please call 1-888-41-ASTEC for further inquiries
or visit us at www.astecpower.com
Figure 92. Recommended reflow profile for SMT modules.
PRE-HEAT ZONE
120 - 180 sec
REFLOW
ZONE
< 80 sec
110
°
C
183
°
C
PEAK TEMPERATURE
200
°
C
-
230
°
C
S
LOPE
< 4
°
C /sec
