North America (USA): 1-888-41-ASTEC
Europe (UK): 44 (1384) 842-211Asia (HK): 852-2437-9662
1
Special Features
Electrical Specs
Special Features
300 Watts
High efficiency (96% Typical)
-40C to +100C Ambient Air Operation
Industry standard package Qtr Brick
1.48" x 2.30" x 0.40"
High capacitive load limit on start-up
12V @ 25A Intermediate Bus Voltage for
DPA application
Regulation to zero load
Output Enable Pin
Meets Basic Insulation
Input UVLO and Overvoltage Protection
Over Temperature Protection
Input
Input Range
1
42 to 53 VDC
Efficiency
96%@12V (Typ)
Over Voltage Protection
60V
Input UVLO
1
39V to 42V
Output
Output Current
0A to 25A max (300W output power)
Line Regulation
10.25V to 13.60V
8.50V to 13.60V (for "-AL" option)
Load Regulation
3% Vo (Typical)
Noise/Ripple
2
100mV (Typical)
Transient Response
200mV typical deviation
50% to 75% Load Change
100s max recovery time
Over Current Limit
1
115% I
O,MAX
typical (latching)
Switching Frequency
800kHz
Control
Enable
TTL compatible
(Positive or Negative Enable Logic)
Isolation Voltage
Input to Output
2000Vdc max
* Specifications are subject to change without notice.
Ambient air operating temperature range:
-40C to +100C
Storage temperature: -55C to +125C
Overtemperature protection: 115C typical
MTBF: > 1 million hours
UL, cUL 60950
TUV EN60950
Environmental
Total Power:
300W (12V @ 25A)
Input Voltages:
48V
No. of Outputs:
Single
Safety
Astec Industry Standard
ALQ25B50
DC Transfromer
EUROPE
Astec House, Waterfront Business Park
Merry Hill, Dudley
West Midlands, DY5 1LX, UK
Telephone: 44 (1384) 842-211
Facsimile: 44 (1384) 843-355
AMERICAS
5810 Van Allen Way
Carlsbad, CA 92008
Telephone: 760-930-4600
Facsimile: 760-930-0698
2
Ordering Information
www.astecpower.com
ASIA
Units 2111-2116, Level 21
Tower1, Metroplaza
223, Hing Fong Road
Fwai Fong, New Territories
Hong Kong
Telephone: 852-2437-9662
Facsimile: 852-2402-4426
Input
Output
Output
Efficiency
Model Number
Voltage
Voltage
Current
42V to 53V
12.0V
25A*
96% Typ
ALQ25B50
42V to 53V
12.0V
25A*
96% Typ
ALQ25B50-6
42V to 53V
12.0V
25A*
96% Typ
ALQ25B50N
42V to 53V
12.0V
25A*
96% Typ
ALQ25B50N-6
36V to 53V
12.0V
25A*
96% Typ
ALQ25B50N-AL
OPTIONS:
Enable Function
"N" = negative logic enable
without "N" = positive logic enable (default)
Pin Length Option
"-6" = 3.7mm (nominal)
Standard pin length is 5mm nominal
Others
"-AL" = Autorecovery mode and lower UVLO range (34V to 36Vdc)
* Derating / airflow required at elevated ambient operating temperature, consult the Technical Rreference Notes
2.00
[50.8]
2.30
[58.4]
PIN SIDE DOWN
PIN SIDE UP
0.15
[3.8]
1.04
[26.5]
0.74
[18.9]
0.44
[11.2]
1.48
[37.6]
1
2
3
SIDE VIEW
MECHANICAL TOLERANCE .002(0.5)
ALL DIMENSIONS ARE IN INCHES (MILLIMETERS)
PIN PLACEMENT TOLERANCE : 0.005(0.127)
4 - Vout
5+ Vout
0.44
[11.2]
0.60
[15.2]
1 + Vin
3 -VIN
2 Enable (On/Off)
PIN ASSIGNMENT
NOTES:
0.06
0.22
[5.5]
0.38
[9.6]
5
4
[1.0]
0.04
[1.5]
Pin Assignments
ALQ25B50
Single Output
1.
+ Vin
2.
Enable
3.
- Vin
4.
- Vout
5.
+ Vout
Notes
:
1. Part number suffix "-AL" designates:
- 36V to 53V Input voltage range
- lower UVLO range (34V to 36V)
- Autorecovery mode after fault protection
2. 20MHz BW limited with external 10uF tantalum
cap. + 0.1uF ceramic cap across the output.
220uF low ESR cap required across the input
pins.
3. Output may need to be derated and airflow
added when operating at elvetaed ambient
temperature.
4. All specifications are typical at nominal line, full
load and 25
o
C ambient temp unless otherwise
noted.
5. Technical Reference Notes should be consulted
for detailed information when available.
6. Warranty: 1yr
Astec Industry Standard
Astec reserves the right to make changes to the information
contained herein without notice and assumes no liability as a
result of its use or application. (REV 01: APRIL 7, 2005)
0.20
[5.0]
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