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Dual Output LM5161-Q1 Fly-Buck™ Reference Design with Ultra-Small Coupled Inductors

PMP15007

Overview

The PMP15007 uses the LM5161-Q1 in Fly-Buck topology with both primary and secondary output voltages set to 5V nominal. This circuit can accommodate a voltage input range of 36V to 72V, making it ideal for a 48V nominal input voltage rail. The primary side is set to 5.32V nominal and the secondary isolation side is 5V with feedback resistors and is based on Coilcraft LPD8035V series coupled inductors set to a 1:1 turns ratio. The maximum operating current is set to 225mA on both the primary and secondary voltage rails. The switching frequency is set to 315kHz nominal.

characteristic

● 36V to 72V input voltage, 5V/225mA (dual) output, 2.25W (one is non-isolated primary, the other is isolated secondary)
● About 75% peak efficiency
● Compact and cost-effective isolated solution with off-the-shelf coupled inductors (rather than custom transformers)
● Solution dimensions: 32 mm x 22 mm (1.25 in x 0.9 in); maximum component height: 3.5 mm
● The 3.5mm maximum height of the coupled inductor helps in height-constrained applications

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Design Files

Documentation

PMP15007 Test Results

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