P-1

REV.: 0/2017

www.recom-power.com

Reference Design

Description

The Half-Bridge Gate-Drive Power Supply Reference Design (RD) consists of a half-bridge

suitable for voltages up to 1kV and a fully-isolated driver stage with isolated power supplies

for the low-side and the high-side switching transistors. It is suitable for single gate drive

supply voltages as low as +4V as well as dual gate drive supply voltages as high as +20V / -5V (30V

max) with no maximum duty cycle limitations.

Two R12P22005D, R12P21053D, R12P21509D and R12P06S DC/DC moduels each are included in

the R-REF01-HB design kit.

NOTE: transistors sold separately.

The signal ground is galvanically isolated from the power ground and can be connected to

any potential, as long as it is less than 2.5kV with respect to the power potential

(high-side and low-side). The limiting element is the gate driver IC specification.

Features:

•

Optimized for very high switching speed

•

2.5kV continuous input to output isolation

•

High gate-drive currents (up to 10A source and sink)

•

The RD is fitted with a SI8273 gate driver, but can be used with any pin-compatible

gate driver with a PWM input (SI8274) or for gate driver ICs with reinforced isolation,

for example the UCC21520 (dual pinout layout on PCB).

This RD can easily be configured for the following topologies (see application suggestions section):

•

LLC half-bridge

•

Asymmetric duty cycle half-bridge (forward and flyback)

•

Active clamp half-bridge (forward and flyback)

•

Full-bridge / phase-shifted full-bridge

•

3-phase B6 bridge

•

NPC B6 bridge (additional driving circuit for NPC is required)

•

Double pulse test

•

Synchronous boost converter

•

Synchronous buck converter

Features

Reference

Design

• Half-bridge voltage up to 1kV

• TTL-compatible signal input

• Single 15V to 42V supply

• Shoot-through protection

• Separate input for low and high-side switch for

use with different topologies

R-REF01-HB

Delivered Board

fully populated

DANGER!

This board is designed to be used with voltages up to 1kV, only qualified

personnel should work with this board. Direct contact with hazardous voltage can

cause injury or death!

Never leave the board operating unattended. After removing the high voltage from

the board, discharge the capacitors with a suitable discharging resistor to avoid elec-

trical shock!

Caution:

This reference design is built with ESD (electrostatic discharge) sensitive

components. Always follow ESD prevention procedures when handling the product

to avoid failures!