Reference Design for 3.3V Input, ±12V (±15V) Output Isolated Power Supply
Manufactured By:Maxim Integrated
Part Number:MAXREFDES7
The Lakewood design (MAXREFDES7#) uses an H-bridgetransformer driver (MAX256) and a pair of low dropout (LDO) linearregulators (MAX1659 x2) to create a ±12V (±15V) output isolated power supply from a 3.3V voltage input. This general-purpose power solution can be used in many different types of isolated power applications.
The Lakewood subsystem reference design operates from a 3.3V DC power source. The MAX256 H-bridge transformer driver switches at approximately 475kHz and drives the primary side of the 1:2.6 turns ratio, with the use of a TGM-H281NF transformer from Halo® Electronics. The transformer secondary side is connected to voltage doublers that rectify the AC outputs into DC outputs. Two MAX1659 LDOs regulate the voltages to 12V and -12V, respectively. The Zener diodes (D3 and D6) protect the LDOs by keeping their input voltages below 16.1V.
Applications:
The Lakewood subsystem reference design operates from a 3.3V DC power source. The MAX256 H-bridge transformer driver switches at approximately 475kHz and drives the primary side of the 1:2.6 turns ratio, with the use of a TGM-H281NF transformer from Halo® Electronics. The transformer secondary side is connected to voltage doublers that rectify the AC outputs into DC outputs. Two MAX1659 LDOs regulate the voltages to 12V and -12V, respectively. The Zener diodes (D3 and D6) protect the LDOs by keeping their input voltages below 16.1V.
Applications:
- Industrial sensors
- Process control
- Industrial automation
- Medical
Features
- Isolated power
- ±12V (±15V) outputs
- Small printed circuit board (PCB) area
- Pmod™-compatible form factor
Ships With
- Board