MP1906—80V, HALF-BRIDGE, GATE DRIVER

MP1906 Rev. 1.0

www.MonolithicPower.com

10

1/3/2013

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© 2013 MPS. All Rights Reserved.

APPLICATION INFORMATION

Reference Design Circuits

Half Bridge Motor Driver

In a half-bridge converter topology, the MOSFET-

driving signals have a dead time: HPWM and

LPWM driven with alternating signals from the

PWM controller. The input voltage can be up to

80V in this application.

HPWM

LPWM

GND

TG

SW

BT

BG

GND

Vin=12V

GND

A

-

+

GND

GND

Up to 80V

HPWM

LPWM

MP1906

Figure 4: Half-Bridge Motor Driver

Active-Clamp-Forward Converter

An

active-clamp-forward-converter

topology

alternately drives the MOSFETs. The high-side

power transformer in a lossless manner. This

topology runs well at duty cycles exceeding 50%.

However, the input voltage may not run at 80V.

HPWM

LPWM

GND

TG

SW

BT

BG

GND

Vin=12V

GND

GND

GND

Up to 80V

HPWM

LPWM

Creset

1

3

2

4

Secondary

Circuit

MP1906

Figure 5: Active-Clamp Forward Converter