Technical Reference Notes
ALQ25 Series
(Open Frame Single Output Quarter Brick)
ALQ25 Single Output Open-Frame DC-DC Converter Module
Industry Standard ¼ Brick: 36V-75V Input / 5V Output
The ALQ25 series is Astec's next generation single output, high-density standard quarter brick offering. It operates from a 36V
to 75V DC Bus and comes in different Isolated Logic Output voltages (ILO) well suited for DPA applications. It’s designed to
conservatively handle 25A of output current for 5V and at high levels of efficiency (5V @ 91%). It provides tight regulation
and exhibits clean and monotonic output start up characteristics. The ALQ25’s come with industry standard features such as
Input UVLO, OCP, OVP, OTP, Output Trim, differential output Sense pins.
Electrical Parameters
Input
Input Range
Input Surge
Efficiency
36-75 VDC
100V / 100ms
91% (Typ)
Control
Enable
TTL compatible
(Positive and Negative Enable Options)
Output
Load Current
5.0V @ 25A max
Line Regulation 0.2 % Vo
0.4 % VO
150mVPK-PK max for 5V
Load Regulation
Ripple and Noise
Special Features
Output Voltage
Adjust Range
Transient Response 5% VO deviation (Typ)
50% to 75% Load Change
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Industry Standard ¼ Brick Footprint
Positive and Negative Enable Options
Regulation to Zero Load
High Capacitive Load Start-up
Fixed Switching Frequency at 200kHz
Output Trim
±10% VO
400msec settling time (Typ)
+10%VO
Remote Sense
Over Current
Protection
Input Under-Voltage Lockout
Low profile / open-frame
140% IO,MAX
Environmental Specifications
Safety
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-40ºC to 85ºC Operating Temperature
(200LFM)
UL + cUL 60950, Recognized (Pending)
EN60950 through TUV-PS (Pending)
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-40ºC to 120ºC Storage Temperature
MTBF > 1 million hours
MODEL: ALQ25 SERIES
Dec 1, 2003 - REVISION B
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