BQ55120ETx20 DC-DC Converter

35-55 V

12 V

20 A

240 W

2000 V dc







DC-DC Converter

Product Details

The BusQor® BQ55120ETx20 bus converter is a nextgeneration, 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 heat sink is not required, which saves cost, weight, height, and application effort. The BusQor series provides an isolated step down voltage from 35- 55 V to a 12 V intermediate bus with no regulation in a standard “eighth-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. RoHS Compliant (see last page).

Operational Features

• Ultra-high efficiency, >95.5% at full rated load current
• Delivers up to 20 amps of output current (240 W) with minimal derating - no heat sink required
• Input voltage range: 35 – 55 V provides 12 V bus for distributed power architectures
• Fixed frequency switching provides predictable EMI performance

Mechanical Features

• Industry standard eighth-brick bus converter pin-out
• Size: 0.90" x 2.3" (22.9x58.4mm) x 0.484" (12.29mm)
• Total weight: 0.7 oz. (20 grams)
• Encased Size: 0.99” x 2.39” (25x 60.6 mm)0.496” (12.6 mm)

Control Features

• On/Off control referenced to input side (positive and negative logic options are available)

Safety Features

• UL 60950-1:2007/R:2011-12
• EN 60950-1:2006/A2:2013
• CAN/CSA C22.2 No. 60950-1:2007/A1:2011

Protection Features

• Input under-voltage lockout and over-voltage shutdown protects against abnormal input voltages
• Output current limit and short circuit protection
• Thermal shutdown