Supertex inc.

HV430

Supertex inc.

www.supertex.com

Doc.# DSFP-HV430

A031414

Features

Applications

General Description

The Supertex HV430 is a high voltage PWM ring generator

integrated circuit. The high voltage outputs, V

V

N-channel and P-channel MOSFETs in a push-pull

configuration. Overcurrent protection is implemented for

both the P-channel and N-channel MOSFETs. External

sense resistors set the over-current trip point.

High-Voltage Ring Generator

The RESET input functions as a power-on reset when

connected to an external capacitor. The FAULT output

indicates an overcurrent condition and is cleared after 4

consecutive cycles with no overcurrent condition. A logic low

on RESET or ENABLE clears the FAULT output. It is active-

low and open-drain to allow wire OR’ing of multiple drivers.

P

P

P

logic high on N

Lockout circuitry prevents the N and P switches from turning

on simultaneously. A pulse width limiter restricts pulse widths

to no less than 100 - 200ns.

For applications where a single control input is desired, the

MODE pin should be connected to SGND. The PWM control

signal is then input to the N

in the control logic ensures break-before-make on the outputs,

thus avoiding cross conduction on the high voltage output

during switching. A logic high on N

Channel MOSFET on and the N-Channel off, and vice versa.

The IC can be powered down by applying a logic low on the

ENABLE pin, placing both external MOSFETs in the off state.

Functional Block Diagram

Ringer

Output

R

SENSE

R

SENSE

V

DD

Down

Translator

N

Driver

FAULT

PIN

NIN

RESET

De-glitcher

DEADBAND

ENABLE

MODE

V

DD

Control

Logic

V

NN1

V

PP1

SIG

GND

V

DD

Current

Trip

PWR

GND

+5.0V

VPP1

VPP2

VPSEN

VPGATE

VNN1

VNN2

VNSEN

VNGATE

10µA

reset

clk

V

NN2

Regulator

Up

Translator

P

Driver

Up

Translator

Down

Translator

Current

Trip

V

PP2

Regulator