QLS30 Series – 30A Quarter-Brick DC/DC Converter
48V Input
1.8V, 1.5V, 1.2V Output
Data Sheet
Features
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Cost-effective single board design
Low profile – 11 mm height
Input/output isolation: 1500VDC, basic
insulation
High efficiency
Output back-drive protection
Start-up into high capacitive load
Low conducted and radiated EMI
Output overcurrent protection
Output overvoltage protection
Overtemperature protection
Remote sense
Set point accuracy
±
1%
Remote on/off (primary referenced), positive
or negative logic
Output voltage trim adjust, positive or
negative
UL 1950 Recognition, CSA 22.2 No. 950-95
certification, TUV IEC950
Applications
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Distributed power architectures
Telecommunications equipment
LAN/WAN applications
Data processing applications
Description
The new QLS30 series of single-output DC/DC converters features single board, multi-layer construction
and an SMT design that is highly reliable due to the low component count and minimal manufacturing touch
time. The QLS30 series uses fewer components than any other equivalently rated single board converter.
The converters can deliver a maximum of 30 Amps with a typical efficiency of 85%. The QLS provides
superior thermal performance, with minimal derating. The QLS30ZB model converter can deliver 22.8
amperes at 1.8 volt output in ambient conditions of 65°C and 200 LFM. This full featured, low profile
converter offers input undervoltage lockout, overload, overvoltage and overtemperature protection. Interface
features include remote on/off, remote sense and output voltage trim.
Selection Chart
Model
Input
voltage
VDC
36-75
36-75
36-75
Input
current,
max
ADC
1.5
1.3
1.1
Output
voltage
Vout,
VDC
1.8
1.5
1.2
Output rated
current
I
rated,
ADC
30
30
30
Output
Ripple/Noise,
mV p-p
100
100
100
Typical
Efficiency
@ I
rated,
%
86
85
84
QLS30ZB
QLS30ZA
QLS30ZY
This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment
should be followed
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REV. 10/1
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