Technical Reference Notes
ALQ25B50 Bus Converter
DC Transformer
The ALQ25B50 is among a series of Bus Converter solutions from Astec intended to drive multiple non-isolated POLs
employed on Distributed Power Architectures (DPA). It’s a DC transformer that accepts a narrow input range (48V nominal) to
ensure a stepped down output of 12V nominal with 10% line regulation. Such a DC conversion scheme allows the converters
to exhibit a purely resistive output characteristic that eases stability management when driving multiple POLs. It comes with
ON/OFF Enable pin, Input over voltage and under voltage protection, OTP and output pin length options.
ALQ25B50 Single Output Open-Frame DC Bus Converter
Industry Standard
¼
Brick: 300W DC Transformer
PRELIMINARY
Electrical Parameters
Input
Input Range
Efficiency
OVP
42-53 VDC
12V up to 96% Efficiency
60Vdc
Control
Enable
TTL compatible
(Positive and Negative Enable Options)
Output
Load Current
Line Regulation
Load Regulation
Ripple and Noise
0A - 25A max
10.25V – 13.6V
±3%Vo (Typical)
80mV (Typical)
Special Features
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300W DC Transformer for DPA Front End
Industry Standard ¼ Brick Footprint
High Efficiency
Positive and Negative Enable Options
Regulation to Zero Load
Meets Basic Insulation
Input OVP and UVLO
Low profile / open-frame
Environmental Specifications
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-40ºC to 85ºC Operating Temperature
-40ºC to 125ºC Storage Temperature
MTBF > 1 million hours
Safety
UL + cUL 60950, Recognized
EN60950 through TUV-PS
MODEL: ALQ25B50 SERIES
SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY)
SHEET 1 OF 11
ASTEC [ Astec America, Inc ]
