Technical Specification
Quarter
48V 12V
8.3A
out
in
Brick
High Efficiency, No Heatsink, Isolated DC/DC Converter
The PQ48120QNA08 PowerQor™ quarter brick
converter is a next-generation, board-mountable,
isolated, fixed switching frequency dc/dc
converter that uses synchronous rectification to
achieve extremely high conversion efficiency. The
power dissipated by the converter is so low that a
heatsink is not required, which saves cost, weight,
height, and application effort. All of the power and
control components are mounted to the multi-layer PCB
substrate with high-yield surface mount technology.
Since the PowerQor converter has no explicit
thermal connections, it is extremely reliable.
PQ48120QNA08 Module
Operational Features
Protection Features
• Ultra-high efficiency, 88% at full rated load current
• Input under-voltage lockout disables converter at
low input voltage conditions
• Delivers up to 100 Watts of output power with mini-
mal derating - no heatsink required
• Output current limit and short circuit protection
protects converter from excessive load current or
short circuits
• Wide input voltage range: 35V – 75V meets or
exceeds all 48V bus standards
• Output over-voltage protection protects load from
• Fixed frequency switching provides predictable EMI
damaging voltages
performance
• Thermal shutdown protects converter from abnor-
mal environmental conditions
• No minimum load requirement means no preload
resistors required
Mechanical Features
Control Features
• Industry standard pin-out configuration (pin for pin
compatible with Lucent QHW series)
• On/Off control referenced to input side (positive
and negative logic options are available)
• Industry standard size: 1.45” x 2.3”
• Remote sense for the output voltage compensates
• Total height less than 0.40”, permits better airflow
for output distribution drops
and smaller card pitch
• Output voltage trim: +10%/-20%, permits custom
voltages and voltage margining
• Total weight: 34 grams (1.2 oz.), lower mass great-
ly reduces vibration and shock problems
Safety Features (cont.)
Safety Features
• Meets 72/23/EEC and 93/68/EEC directives
• 2000V, 10 MΩ input-to-output isolation provides
which facilitates CE Marking in user’s end product
• Board and plastic components meet 94V-0 flamma-
bility requirements
input/output ground separation
• UL 1950 recognized (US & Canada), basic insula-
tion rating
• TUV certified to EN60950
Product # PQ48120QNA08
Phone 1-888-567-9596
Doc.# 005-2QN412D_C
9/04/01
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