Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
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.
ALQ50 Single Output Open-Frame DC-DC Converter Module
Industry Standard
¼
Brick: 36V-75V Input / 50A Output Current
PRELIMINARY
Electrical Parameters
Input
Input Range
Input Surge
Efficiency
36-75 VDC
100V / 100ms
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
Special Features
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•
•
•
•
•
•
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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 480kHz
Output Trim
Input Under-Voltage Lockout
Low profile / open-frame
Load Current
Line/Load Regulation
Ripple and Noise
Output Voltage
Adjust Range
Transient Response
2.5V @ 50A max
< 1% V
O
60mV
PK-PK
max
±10% V
O
5% V
O
deviation (Typ)
50% to 75% Load Change
250µsec settling time (Typ)
+10%V
O
120% I
O,MAX
Remote Sense
Over Current
Protection
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 (Pending)
EN60950 through TUV-PS (Pending)
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
SHEET 1 OF 16
ASTEC [ Astec America, Inc ]
