Technical Reference Notes

ALQ40/50 Series

(Open Frame Single Output Quarter Brick)

MODEL: ALQ50 SERIES

SHEET 1 OF 16

APRIL 21, 2003 - REVISION A (PRELIMINARY)

ALQ50 Single Output Open-Frame DC-DC Converter Module

Industry Standard ¼ Brick: 36V-75V Input / 50A Output Current

The ALQ50 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 50A of output current for 2.5V and below at high levels of efficiency (3.3V @ 90.5%). It provides tight

regulation and exhibits clean and monotonic output start up characteristics. The ALQ50’s come with industry standard features

such as Input UVLO, OCP, OVP, OTP, Output Trim, differential output Sense pins. With its 0.36” low profile and open frame

construction, it offers optimum board mounting flexibility.

Special Features

•

Industry Standard ¼ Brick Footprint

•

Positive and Negative Enable Options

•

Regulation to Zero Load

•

High Capacitive Load Start-up

•

Fixed Switching Frequency at 480kHz

•

Output Trim

•

Input Under-Voltage Lockout

•

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

36-75 VDC

Input Surge

100V / 100ms

Efficiency

3.3V @ 90.5% (Typ)

2.5V @ 90.0%

1.8V @ 89.0%

1.2V @ 86.5%

Control

Enable

TTL compatible

(Positive and Negative Enable Options)

Output

Load Current

2.5V @ 50A max

Ripple and Noise

Output Voltage

Adjust Range

Transient Response

50% to 75% Load Change

250

µsec settling time (Typ)

Remote Sense

Over Current

Protection

Safety

UL + cUL 60950, Recognized (Pending)

EN60950 through TUV-PS (Pending)

PRELIMINARY