HV9606 Supertex, Inc., HV9606 Datasheet

HV9606

Manufacturer Part Number

HV9606

Description

Switchmode PWM Controller

Manufacturer

Supertex, Inc.

Datasheet

1.HV9606.pdf (9 pages)

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Features

❑ Synchronous Forward, Forward, and Flyback

❑ Lowest External Parts Count, Smallest Magnetics

❑ Eliminates Bootstrap Transformer Winding

❑ Supervisor Circuit Reduces Output Capacitance* up to 40%

❑ Supervisor Circuit Functions as µP WATCHDOG

❑ 15V to 250V Start-Up Regulator with START/STOP Control

❑ <1mA Operating, <6µA Standby Input Current

❑ V

❑ Charge Pump Voltage Multiplier Gate Drive Supply

❑ Compatible with Logic Gate MOSFETs at VDD = 3.3V

❑ Compatible with Standard Gate MOSFETs at VDD = 5V

❑ Programmable Soft Start

❑ <50% Duty Cycle Operation

❑ 15KHz to 350KHz Fixed Frequency PWM Operation

❑ Fault Tolerant Peer-to-Peer Synchronization

❑ Precision !1% Band Gap Voltage Reference

❑ Precision !4% Current Limit

❑ Current Sense Leading Edge Blanking

❑ Fast Over Current Shutdown

❑ Small SSOP-20 Footprint

* For short duration line loss, supervisor disables soft start if output within tolerance

when V

Typical Application Circuit

03/05/02

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.

To SYNC pin of other HV9606 PWMs.

+48V

GND

returns and thus reduces holdup requirements.

Powered Operation down to 2.9V

Current-Mode PWM Controller with Supervisor

10W Non-Isolated 48V to 3.3V Flyback Converter

VDD

START

STOP

Vin

REF

SYNC

SGND

PGND

STATUS

SENSE

COMP

GATE

VX2

General Description

The HV9606 PWM controller allows the design of high efficiency

(>90%) power supplies for distributed board mounted power

(BMP) applications. Its high frequency capability provides high

currents (20A @ 3.3V) with small transformers and its low

internal operating voltage and current is capable of achieving

high efficiencies in low power applications.

The HV9606 utilizes fixed frequency current mode control with

duty cycle internally limited to <50%. It supports both isolated

and non-isolated topologies and provides all the necessary

functions to implement a flyback, forward or synchronous forward

converter with a minimum of external parts. The low V

of the HV9606 eliminates the bootstrap magnetic winding in non-

isolated topologies. An on chip charge pump generates the gate

drive voltage for driving an external N-channel MOSFET and

eliminates the need for clamping by offering 250V immunity to

high voltage transients common in telecom and network systems.

Applications

❑ Powered Ethernet and VoIP Terminals

❑ Cable Modems and Amplifiers

❑ ISDN Network Terminations, Terminals and Adapters

❑ Network Equipment

❑ Servers, PCs and Peripheral Equipment

❑ Telecommunication Systems and Terminals

❑ Distributed Board Mounted Power

❑ Battery Backup Systems

❑ Portable Power Applications

❑ Automotive and Heavy Equipment

R10

C10

To µP

RESET

Pin.

+3.3V

GND

(continued on back page)

HV9606

operation

HV9906

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