Technical Reference Notes

ALQ25B50 Bus Converter

DC Transformer

MODEL: ALQ25B50 SERIES

SHEET 1 OF 11

SEPTEMBER 11, 2003 - REVISION A (PRELIMINARY)

ALQ25B50 Single Output Open-Frame DC Bus Converter

Industry Standard ¼ Brick: 300W 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.

Special Features

•

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

•

-40ºC to 85ºC Operating Temperature

•

-40ºC to 125ºC Storage Temperature

•

MTBF > 1 million hours

Electrical Parameters

Input

Input Range

42-53 VDC

Efficiency

12V up to 96% Efficiency

OVP

60Vdc

Control

Enable

TTL compatible

(Positive and Negative Enable Options)

Output

Load Current

0A - 25A max

Line Regulation

10.25V – 13.6V

Load Regulation

±3%Vo (Typical)

Ripple and Noise

80mV (Typical)

Safety

UL + cUL 60950, Recognized

EN60950 through TUV-PS

PRELIMINARY