Technical Reference Notes
AEH25B48N-6CL Series
AEH25B48X-XCXL Isolated DC/DC Converter Module
Industry Standard ½ Brick – 36-75V Input, 12V / 25A Output
The AEH25B48N-6CL is a second-generation 12V half brick capable of delivering 25A output current or 300W maximum
output power. It comes with industry standard brick features like: On/Off Enable pin, Differential Remote Sense pins, Output
Trim pin; Input UVLO, OCP, OVP, OTP and operates from an input line voltage of 36 – 75 Vdc.
Electrical Parameters
Input
Input range
Input Surge
Efficiency
36-75 VDC
100V / 100ms
94% (typ)
Control
Enable
Positive & Negative Logic
options
Output
Regulation
(Line, Load, Temp) <2%
Ripple and Noise
150mV p-p
Output Voltage
Adjust Range
±10% of nominal output
Transient Response 180mV typ output deviation
50% to 75% load transient
1A/10µs Slew rate
300 µs recovery
Over Voltage
Protection
115% nominal
Special Features
•
•
•
•
•
•
•
•
•
High efficiency
-40°C to 100°C baseplate operating temp
Enable On/Off
Low output ripple and noise
High capacitive load limit
Remote sense compensation
Regulation to zero load
Fixed frequency switching (200KHz)
EU Directive 2002/95/EC compliant for RoHS
Environmental Specifications
•
•
•
Operating temperature:
-40°C to +85°C (Ambient)
Storage temperature: -40°C to +125C
DMTBF: > 2.5 MHrs
Safety
•
•
UL, cUL 60950 Recognized
EN 60950 through TUV-PS
MODEL: AEH25B48X-XCXL
AUGUST 4, 2008 REV 03
SHEET 1 OF 12
Technical Reference Notes (AEH25B48N-6CL)
ELECTRICAL SPECIFICATIONS
Standard test condition on a single unit, unless otherwise specified.
T
A
:
+V
IN
:
-V
IN
:
Enable:
+V
OUT
:
-V
OUT
:
Trim (V
ADJ
):
+Sense:
-Sense:
Input Cap:
25°C (Ambient Air)
48V ± 2%
Return pin for +V
IN
Open (Positive Enable)
Connect to Load
Connect to Load (return)
Open
Connect to +V
OUT
Connect to -V
OUT
220uF
ABSOLUTE MAXIMUM RATINGS
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. Functional operation
of the device is not implied at these or any other conditions in excess of those given in the operational sections of the
specs. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability.
Parameter
Input Voltage:
Continuous:
Transient (100ms)
Operating Ambient Temperature
Storage Temperature
Operating Humidity
I/O Isolation
Output Power
Device
All
All
All
T Suffix
All
All
All
All
Symbol
V
I
V
I, trans
T
C
T
STG
-
-
P
O,max
Min
0
0
-40
0
-55
-
-
-
Typ
-
-
-
-
-
-
-
Max
75
100
85
55
125
85
1500
300
Unit
Vdc
Vdc
ºC
ºC
%
Vdc
W
INPUT SPECIFICATIONS
Parameter
Operating Input Voltage
Undervoltage Lockout
Turn-on Point
Turn-off Point
Maximum Input Current
1
(V
IN
= 0 to V
IN,max
: I
O
= I
O,max
)
Input Reflected-ripple Current
2
(5Hz to 20MHz: 12uH source
impedance: T
A
= 25 ºC)
No Load Input Power
(V
IN
= V
IN,nom
T
A
= 25 ºC)
MODEL: AEH25B48X-XCXL
AUGUST 4, 2008 REV 03
Device
All
All
All
All
All
Symbol
V
IN
-
-
I
IN,max
I
I
Min
36
34.0
32.5
-
-
Typ
48
34.8
33.5
-
-
Max
75
35.5
34.5
11.0
15
Unit
V
DC
V
V
A
mA
PK-PK
All
-
-
-
7.5
W
SHEET 2 OF 12
Technical Reference Notes (AEH25B48N-6CL)
ELECTRICAL SPECIFICATIONS
(continued)
OUTPUT SPECIFICATIONS
Parameter
Output Voltage Setpoint
(V
IN
= V
IN,min
to V
IN,max
at
I
O
= I
O,max
; T
A
= 25 ºC )
Output Regulation:
Line
Load (I
O
= I
O,min
to I
O,max
)
Temp (-40 ºC to 100ºC)
Output Ripple and Noise
3
(5 Hz to 20 MHz)
V
IN
= 36V, 48V
V
IN
= 75V
External Load Capacitance
Device
All
Symbol
V
O,SET
Min
11.80
Typ
12.00
Max
12.20
Unit
Vdc
All
All
All
-
-
-
-
-
-
0.1
0.1
-
0.4
0.4
1.0
%
%
%Vo
mV
PK-PK
mV
PK-PK
µF
All
All
T suffix
All
All
All
All
All
All
-
-
-
-
Io
Io
-
-
-
-
-
-
-
-
0
26
92
160
25
-
120
-
-
-
-
-
92.7
185
40
0
Rated Output Current
Output Current-limit Inception
4
(Latching)
Efficiency
5
(V
I
= V
IN,nom
; I
O,max
; T
A
= 25°C)
Switching Frequency
Output Rise Time
(I
O
= I
O,max
; Enable to Vo within 1%)
150
250
10,000
see note
8
25
32
-
210
60
4
A
A
%
KHz
msec
%Vo
Output Voltage Overshoot
(I
O
= I
O,max
; T
A
= 25°C)
Dynamic Response
6
:
(∆I
O
/∆t = 1A/10µs ; V
I
= V
IN,nom
;
T
A
= 25°C)
Load Change from I
O
= 50% to
75% of I
O,max
:
Peak Deviation Settling Time (to
V
O,SET
Tolerance)
Load Change from I
O
= 50% to
25% of I
O,max
:
Peak Deviation Settling Time (to
V
O,SET
Tolerance)
Enable Pin Voltage :
Logic Low
Logic High
Enable Pin Current :
Logic Low
Logic High (I
LEAKAGE
at 10V)
Module Output Voltage @ Logic Hi
Module Output voltage @ Logic
Low
All
-
-
-
-
-
-
180
300
180
300
260
500
260
500
mV
µsec
mV
µsec
All
-
-
All
All
All
All
AEH
-0.7
2.95
-
-
-
-
-
-
-
-
1.2
10
1.0
50
0.2
V
V
ma
µA
V
MODEL: AEH25B48X-XCXL
AUGUST 4, 2008 REV 03
SHEET 3 OF 12
Technical Reference Notes (AEH25B48N-6CL)
ELECTRICAL SPECIFICATIONS
(continued)
OUTPUT SPECIFICATIONS
Parameter
Output Voltage Adjustment Range
7
Output Overvoltage Clamp
4
(Latching)
Note:
Device
All
All
Symbol
-
V
O,CLAMP
Min
90
13.35
Typ
-
13.60
Max
110
14.00
Unit
%Vo
V
1. The power module is not internally fused. An input line fuse (e.g. 15A , 250V fast blow) is
recommended.
2. Refer to Figure 1 for the input reflected ripple current test setup.
3. Refer to Figure 2 for the output ripple test setup.
4. OCP and OVP protection modes are latching.
5. Refer to Figure 5 for the efficiency curves.
6. Refer to the output transient characteristics on Figures 10. For 100% to 0% step load deviation – a
min of 660uF capacitor on the output is required to prevent the module into going OVP.
7. For Output Voltage Adjustment setup, refer to Figures 3 and 4. For Vin < 39V, the output can only be
trimmed up 5% and the minimum OVP clamp is reduced to 12.75V.
8. “T” suffix is a custom module tuned to operate with around 5,760 uF of output capacitance (15pcs
OSCON 16SVP330M caps and 3pcs OSCON 16SP270M connected in parallel).
SAFETY AGENCY / MATERIAL RATING / ISOLATION
Device
All
All
Device
All
All
All
Safety Approval
Material Flammability Rating
Parameter
Input to Output Capacitance
Input to output Resistance
Input to Output Insulation Type
UL/cUL 60950-1 First Edition
EN 60950 through TUV
UL94V-0
Symbol
Min
Typical
-
2700
-
10
-
Basic
Max
-
-
-
Unit
pF
MOhms
-
MODEL: AEH25B48X-XCXL
AUGUST 4, 2008 REV 03
SHEET 4 OF 12
Technical Reference Notes (AEH25B48N-6CL)
ELECTRICAL SPECIFICATIONS
(continued)
TO OSCILLOSCOPE
Ltest
12 uH
BATTERY
Cs 220 uF
ESR < 0.1 OHM
@ 20 ºC, 100 kHz
Vi(+)
Cs 220 uF
33 uF
ESR < 0.1 OHM
ESR < 0.7 OHM
@ 20 ºC, 100 kHz
Vi(-)
Note: Measure the input reflected-ripple current with a simulated source inductance (L
TEST
) of 12uH.
Capacitor C
S
offsets possible battery impedance. Measure current as shown above. On 12V unit, a
minimum 220uF <0.1 Ohm ESR capacitor is required across input terminals for proper operation
(same as capacitor on battery side of Ltest)
Figure 1. Input Reflected -Ripple Test Setup.
COPPER STRIP
Vo(+)
0.1 uF
Vo(-)
10 uF SCOPE
RESISTIVE
LOAD
Note: Use a 0.1µF @50V X7R ceramic capacitor and a 10µF @ 25V 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 module.
Figure 2. Peak to Peak Output Noise and Ripple Test Measurement Setup.
MODEL: AEH25B48X-XCXL
AUGUST 4, 2008 REV 03
SHEET 5 OF 12
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