ALH25AF48(N) HALF-BRICK DUAL OUTPUT SERIES
3 6 V D C T O 7 5 V D C I N P U T, 1 0 0 W D C / D C C O N V E R T E R
Introduction
ALH25AF48(N) half-brick dual output products
provide two independent and fully regulated
positive outputs, the outputs are also separate-
ly trimmable. A remote on/off feature is includ-
ed as standard. ALH25AF48(N) dual output iso-
Features
1. Two independent positive outputs
2. Each output is separately trimmable
3. Remote control function
4. High efficiency
5. High power density
lated DC/DC converters are built using the
industry standard half-brick pin-out and pack-
age 61.0mm x 57.9mm x 12.7mm (2.4" x 2.28"
x 0.5"). Typical efficiencies are 88% for the
5V/3.3V outputs. The ALH25AF48(N) dual out-
put series are available with 2:1 input range of
36V-75V, and with output combination of
5V/3.3V at maximum current of 25 Amps and
output power is less than 100W. The maximum
13.
current can be drawn from either output, or in
any combination, as long as the total output
current does not exceed 25 Amps and the out-
put power is 100W. The input-output isolation is
1500Vdc.
ALH25AF48(N) half-brick dual output products
are designed to meet CISPR22, EN55022, UL,
TUV, and CSA certifications.
Wide
operating
board
temperature:
-40°C ~ 110°C
14. No minimum load requirement
6. Low output noise
7. Open frame structure
8. Input undervoltage protection
9. Short circuit protection
10. Over current protection
11. Output overvoltage protection
12. Over-temperature protection
TEL:
FAX:
USA
1-760-930-4600
1-760-930-0698
Europe
44-(0)1384-842-211
44-(0)1384-843-355
Asia
852-2437-9662
852-2402-4426
-2-
www.astec.com
ALH25AF48(N) HALF-BRICK DUAL OUTPUT SERIES
3 6 V D C T O 7 5 V D C I N P U T, 1 0 0 W D C / D C C O N V E R T E R
Typical Application
NOTE:
CNT logic is optional.
Positive Logic Control (for ALH25AF48):
Low=Off, High=On.
Negative Logic Control (for ALH25AF48N): Low=On, High=Off.
Recommended External components:
Fuse : Recommended: 10A.
C1 : Recommended 100µF/100V (use two parallel if Ta< -5°C).
C3=C5* : Recommended electrolytic capacitor of 1000µF/10V(LOW ESR).
C2=C4 : Recommended metallitic film capacitor of 1µF/50V.
Note*: For C3 and C5, the minimum output capacitor is 470µF/10V.
If Ta< -5°C, the minimum external load capacitor is 440µF( 2X220µF tantalum capacitor parallel)
Block Diagram
+Vin
-Vin
1
EMI
Filter
2
OCP
5
4
+Vo1
-Vo1
To -Vin
Feed-
back
6
TRM1
+Vo2
-Vo2
TRM2
7
CNT
3
PWM
8
PWM
Error
AMP
9
TEL:
FAX:
USA
1-760-930-4600
1-760-930-0698
Europe
44-(0)1384-842-211
44-(0)1384-843-355
Asia
852-2437-9662
852-2402-4426
-3-
www.astec.com
ALH25AF48(N) HALF-BRICK DUAL OUTPUT SERIES
3 6 V D C T O 7 5 V D C I N P U T, 1 0 0 W D C / D C C O N V E R T E R
Model Numbering
ALH 25 A F 48 N - 7
1
2
3
4
5
6
7
Note:
1--- Product series name
2--- Output rated current
3--- First rated output voltag is 5V
4--- Second rated output voltage is 3.3V
5--- Input rated voltage is 48V
6--- CNT Optional Mark: N presents negative logic, default is positive logic
7--- Pin length
Default: 4.8mm ± 0.5mm ( 0.189in. ± 0.02in.)
7: 5.8mm ± 0.5mm ( 0.228in. ± 0.02in.)
6: 3.8mm ± 0.25mm ( 0.15in. ± 0.01in.)
8: 2.8mm ± 0.25mm ( 0.11in. ± 0.01in.)
Ordering Information
Model
Number
Input
Voltage
(V)
48
Output
Voltage
(V)
5, 3.3
Output
Current
( A )max
20, 25
Ripple & Noise
(mV pp)
max
100
Efficiency*
(%)
min typ
86
85
80
ALH25AF48(N)-6
48
5, 3.3
20, 25
100
86
85
80
ALH25AF48(N)
48
5, 3.3
20, 25
100
86
85
80
88
87
82
88
87
82
88
87
82
notes and conditions
ALH25AF48(N)-7
Io1=20A, Io2=0A
Io1=10A, Io2=15A
Io1=0A, Io2=25A
Io1=20A, Io2=0A
Io1=10A, Io2=15A
Io1=0A, Io2=25A
Io1=20A, Io2=0A
Io1=10A, Io2=15A
Io1=0A, Io2=25A
Note:
*: Testing conditions are: Ta=25°C, wind velocity=300ft./min.
TEL:
FAX:
USA
1-760-930-4600
1-760-930-0698
Europe
44-(0)1384-842-211
44-(0)1384-843-355
Asia
852-2437-9662
852-2402-4426
-4-
www.astec.com
ALH25AF48(N) HALF-BRICK DUAL OUTPUT SERIES
3 6 V D C T O 7 5 V D C I N P U T, 1 0 0 W D C / D C C O N V E R T E R
Absolute Maximum Rating
Characteristic
Input Voltage(continuous)
Input Voltage(peak/surge)
Board temperature
storage temperature
Min
-0.3
-0.3
-40
-55
Typ
Max
80
100
110
125
Units
Vdc
Vdc
°C
°C
100ms non-repetitive
Notes
Input Characteristics
Characteristic
Input Voltage Range
Input Reflected Current
Turn-off Input Voltage
Turn-on Input Voltage
Turn On Time
Turn On Delay
30
31
Min
36
Typ
48
12
33
34.5
6
8
Max
75
25
35
36
20
20
Units
Vdc
mAp-p
V
V
ms
ms
Vin=48V, Io1=10A, Io2=15A
Notes
CNT Function
Characteristic
Logic High
Logic Low
Control Current
Min
3
-0.7
Typ
Max
10
1.2
2
Units
Vdc
Vdc
mA
Notes
Logic optional.
General Specifications
Characteristic
MTBF
Isolation
Pin solder temperature
Hand Soldering Time
Weight
80
Min
Typ
1200
1500
260
5
Max
Units
k Hrs
Vdc
°C
s
grams
wave solder < 15 s
iron temperature 425°C
Notes
25°C (board)
TEL:
FAX:
USA
1-760-930-4600
1-760-930-0698
Europe
44-(0)1384-842-211
44-(0)1384-843-355
Asia
852-2437-9662
852-2402-4426
-5-
www.astec.com
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