BQ55120QEX50 Datasheet, PDF (1/14 Pages) SynQor Worldwide Headquarters – On/Off control referenced to input side

Technical
Specification
BQ55120QEx50
35-55V
Continuous Input
12.0V
Output
50A
Max Current
The BusQor BQ55120QEx50 bus 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. The BusQor series provides an isolated step down
voltage from 48V to 12 or 9.6V intermediate bus with no
regulation in a standard “quarter-brick” module. BusQor
converters are ideal for creating the mid-bus voltage
required to drive point-of-load (non-isolated) converters in
intermediate bus architectures.
2000V dc
Isolation
Bus
Quarter-brick
DC-DC Converter
®
Bus
Converter
Operational Features
• High efficiency, 96.8 % at full rated load current at full load
• Delivers full power with minimal derating - no heatsink required
• Operating input voltage range: 35-55V dc
• Fixed frequency switching provides predictable EMI
• No minimum load requirement
Mechanical Features
• Industry standard size: 1.45” x 2.3” (36.8x58.4mm)
• Total OF height: 0.467” (11.86mm)
• Total open frame weight: 1.5 oz (42 g)
• Total Baseplate height: 0.517" (13.13mm)
• Total Baseplate weight: 2.7 oz (78 g)
BQ55120QEA50NRS-G
Control Features
• On/Off control referenced to input side
• Inherent current share (by droop method) for high current and
parallel applications.
Safety Features
• UL 60950-1:2007
• EN60950-1/A11:2009/A1:2010
• CAN/CSA-C22.2 No. 60950-1:2007
• IEC 61000-4-2
Protection Features
• Input under-voltage lockout and over-voltage shutdown protects
against abnormal input voltages
• Output current limit and short circuit protection (auto recovery)
• Output over-voltage protection
• Thermal shutdown
Contents
Page No.
Open Frame Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Baseplated Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electrical Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Standards and Qualifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Technical Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ordering Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Product # BQ55120QEx50
Phone [phone]
www.synqor.com
Doc.# 005-0005571 Rev. F
10/03/11
Page 1