HV9606X Supertex Inc, HV9606X Datasheet

HV9606X

Manufacturer Part Number

HV9606X

Description

HV9606 Current-Mode PWM Controller with Supervisor

Manufacturer

Supertex Inc

Datasheet

1.HV9606X.pdf (9 pages)

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Features

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

within tolerance when V

requirements.

Applications

Typical Application Circuit

Synchronous Forward, Forward, and Flyback Controller

Lowest External Parts Count, Smallest Magnetics

Eliminates Bootstrap Transformer Winding

Supervisor Circuit Reduces Output Capacitance* up to 40%

Supervisor Circuit Functions as P Supply Monitor and POR

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

<1mA Operating, <6 A Standby Input Current

Charge Pump Gate Drive Supply

Programmable Soft Start

Under Voltage Lockout with Programmable Hysteresis

<50% Duty Cycle Operation

15kHz to 400kHz Fixed Frequency PWM Operation

Fault Tolerant Peer-to-Peer Synchronization

Precision 1% Band Gap Voltage Reference

Current Sense Leading Edge Blanking

Small SSOP-20 Footprint

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

Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com

Powered Operation down to 2.9V

HV9606 Current-Mode PWM Controller with Supervisor

returns and thus reduces holdup

To SYNC pin of other HV9606 PWMs.

+48V

GND

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. Due to its high frequency capability it can provide

high currents (20A @ 3.3V) with small transformers and due to its

low internal operating voltage and current is also able to achieve

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. Due to its low V

bootstrap

topologies.

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. It conforms

to the requirements of IEEE 802.3 Powered Ethernet and ETR-080

ISDN specifications.

The oscillator is programmable and provides fault tolerant peer-to-

peer synchronization to other similar circuits or master clock. The

chip draws almost no current (<6 A @ V

programmable START/STOP thresholds of the start-up regulator

are satisfied. It can also be powered via the V

the V

Other functions include leading edge current sense blanking,

programmable SOFT START, precision 1% band gap reference

and a SUPERVISOR CIRCUIT. The SUPERVISOR can provide

housekeeping functions such as P supply monitoring and reset,

soft start inhibit for rapid restart on short duration input voltage

interruption.

requirements.

pin, in the range of 2.9V to 5.5V.

magnetic

An on chip charge pump generates the gate drive

It also minimizes input and output capacitance

winding

R10

C10

eliminated

To uP

RESET

Pin.

+3.3V

GND

Initial Release

< 20V) until the

4/15/2002-R.L2

pin, rather than

HV9606

operation the

non-isolated

Related parts for HV9606X

HV9606X Summary of contents

Page 1

HV9606 Current-Mode PWM Controller with Supervisor Features Synchronous Forward, Forward, and Flyback Controller Lowest External Parts Count, Smallest Magnetics Eliminates Bootstrap Transformer Winding Supervisor Circuit Reduces Output Capacitance 40% Supervisor Circuit Functions as P Supply Monitor and POR ...

Page 2

Electrical Characteristics Symbol Parameter Pre-Regulator/Start-up V Regulator input voltage IN I Input leakage current IN I Input leakage current IN V Regulator output voltage DD(REG) UVLO V Under voltage lockout threshold VDD DD UVLO V Under voltage lockout hysteresis VDD ...

Page 3

Electrical Characteristics – Continued Symbol Parameter Reference V Reference output voltage REF V Reference output voltage tolerance REF V Reference output voltage tolerance REF V Load regulation REF V Line regulation REF I Short circuit current REF(SHORT) Current Sensing (Test ...

Page 4

... LED indicator. 4 Package Options Dice HV9606X The value of the resistor required will depend on the , however, current sensing is blanked during the first 85ns . REF voltage doubler circuit. ...

Page 5

Functional Block Diagram Vin Regulator Enable STOP Programable Start/Stop Circuit Oscillator START Enable Oscillator CLK ___ CLR Soft Start Enable Supervisor Circuit Vdd RT SYNC STATUS SENSE Functional Description The HV9606 is composed of several functional ...

Page 6

Functional Description – Continued Start-Up Regulator The start-up regulator guarantees a maximum V current 20V at the V pin while it is inhibited by the IN START/STOP circuit. When the effective input voltage exceeds the programmed ...

Page 7

Functional Description – Continued Current Sense and Current Limit Current sensing is accomplished by means of a resistor connected in series with the source of the external power MOSFET. There are two independent comparators monitoring the voltage drop across this ...

Page 8

Application Information Typical Semi-Isolated ISDN Circuit 1.5W Flyback Converter +48V GND Typical Isolated ISDN Circuit 1.5W Isolated Flyback Converter +48V GND Supertex, Inc. 1235 Bordeaux Drive, ...

Page 9

Application Information Typical Board Mounted Power (BMP) Supply 48V to 3.3V @ 20A Isolated Synchronous Forward Converter with Resonant Core Reset R12 VDD 2 START R1 3 STOP +48V 4 Vin C4 5 REF ...

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