PMP9478

Low Profile Quad Output Isolated Fly-Buck Power Supply for Industrial Application Reference Design

PMP9478

Design files

Overview

The PMP9478 reference design is a low profile quad output isolated Flybuck power supply for industrial applications. The power supply has a synchronous buck regulator, LM5017, and a low profile (6mm) transformer. It generates four isolated outputs of ±5V, ±15V, 50mA each. The LM5017 is a 100V wide Vin, 600mA synchronous buck regulator. The input voltage range of the design is 20V to 32V, making it suitable for 24V input industrial application. The Flybuck can regulate the secondary side outputs without opto-coupler or aux winding, and is capable of achieving good cross regulation within ±5%. With LM5017's Constant On-Time control, no loop compensation is required, which simplifies the design and helps reduce the external part count and BOM cost.

Features

Multiple isolated bias power using Fly-Buck, ideal for PLC and industrial applications
2W output power, +/-15V, +/-5V @ 50mA each, with LM5017 capable of 7.5V to 100V input
Primary Side Regulation without Opto, Good Cross Regulation, within +/-5%
Less than 6mm low profile transformer
Constant On Time Control, No Loop Compensation Required, and Fast Transient Response
This circuit board is tested, and the design files and test report are included

Output voltage options	PMP9478.1	PMP9478.2	PMP9478.3	PMP9478.4
Vin (Min) (V)	20	20	20	20
Vin (Max) (V)	32	32	32	32
Vout (Nom) (V)	-5	15	-15	5
Iout (Max) (A)	.05	.05	.05	.05
Output Power (W)	.25	.75	.75	.25
Isolated/Non-Isolated	Isolated	Isolated	Isolated	Isolated
Input Type	DC	DC	DC	DC
Topology	FlyBuck	FlyBuck	FlyBuck	FlyBuck