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HV430

High Voltage Ring Generator

Features

❏ 105Vrms ring signal

❏ Output over current protection

❏ 5.0V CMOS logic control

❏ Logic enable/disable to save power

❏ Adjustable deadband in single-control mode

❏ Power-on reset

❏ Fault output for problem detection

Applications

❏ Line access cards

❏ Set-top/Street box

General Description

The Supertex HV430 is a high voltage PWM ring generator

are used to drive the gates of external high voltage P-channel

and N-channel MOSFETs in a push-pull configuration. Over

current protection is implemented for both the P-channel and N-

channel MOSFETs. External sense resistors set the over-cur-

rent trip point.

The RESET input functions as a power-on reset when connected

to an external capacitor.

The FAULT output indicates an over-current 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.

will turn on the external N-channel MOSFET. 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

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

thus avoiding cross conduction on the high voltage output during

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.

Absolute Maximum Ratings

+340V

+220V

+220V

-220V

-220V

+7.5V

Storage temperature

-65°C to +150°C

Power dissipation

600mW

Ordering Information

Operating Voltage

Package Options

SOW-20

325V

HV430WG

12/13/01

Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability

indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to

workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the

Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.