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    • Reference Design for 3.3V to 15V Input, ±15V (±12V) Output, Isolated Power Supply
    • Reference Design for 3.3V to 15V Input, ±15V (±12V) Output, Isolated Power Supply

    Overview

    The Oceanside design (MAXREFDES9#) uses a step-up controller(MAX668), a 36V H-bridgetransformer driver (MAX13256), and a pair of low dropout (LDO) linear regulators (MAX1659 x2) to create a ±15V (±12V) output isolated power supply from a wide range of input voltages. This general purpose power solution can be used in many different types of isolated power applications.

    The Oceanside subsystem reference design operates from a 3.3V to 15V DC power source. The MAX668 high-efficiency step-up controller boosts the input voltage to 16V and connects to the input of the H-bridge transformer driver. The MAX13256 H-bridge transformer driver switches at 425kHz and drives the primary side of the 1:1 turns ratio, with the use of TGMR-501V6LF transformers from Halo® Electronics. The full-wave bridge rectifiers convert the AC outputs of the Halo transformers’ secondary coils into DC outputs. The LDOs regulate the voltages to ±15V. The Zener diodes (D3 and D4) protect the LDOs by keeping their input voltages below 16.5V.

    Applications:
    • Industrial sensors
    • Process control
    • Industrial automation
    • Medical

    Features

    • Isolated power
    • ±15V (±12V) outputs
    • Small printed-circuit board (PCB) area
    • Pmod™-compatible form factor

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