Supertex inc.

HV9120

Supertex inc.

www.supertex.com

Doc.# DSFP-HV9120

B060412

Features

Applications

General Description

The Supertex HV9120 is a Switch Mode Power Supply

(SMPS) controller subsystem that can start and run directly

from almost any DC input, from a 12V battery to a rectified

and filtered 240V AC line. It contains all the elements

required to build a single-switch converter except for the

switch, magnetic assembly, output rectifier(s) and filter(s).

High-Voltage,

Current-Mode PWM Controller

+

–

+

–

+

–

+

–

+

–

OSC

R

S

Q

COMP

FB

VREF

BIAS

VDD

+VIN

Pre-regulator/Startup

8.6V

8.1V

S

R

Q

V

DD

SHUTDOWN

RESET

SENSE

OUTPUT

4V

1.2V

To VDD

2V

T

Q

5 (6)

6 (8)

4 (5)

12 (16)

13 (17)

1 (3)

7 (9)

16 (20)

11 (14)

15

(19)

14

(18)

9

(11) 8 (10)

REF

GEN

Modulator

Comparator

Current Limit

Comparator

OSC

IN

OSC

OUT

Undervoltage

Comparator

Error

Amplifier

To

Internal

Circuits

Current

Sources

-VIN

A unique input circuit allows the HV9120 to self-start directly

from a high voltage input, and subsequently take the power

to operate from one of the outputs of the converter it is

controlling, allowing very efficient operation while maintaining

input-to-output galvanic isolation limited in voltage only by

the insulation system of the associated magnetic assembly.

A ±2% internal bandgap reference, internal operational

amplifier, very high speed comparator, and output buffer

allow production of rugged, high performance, high efficiency

power supplies of 50W or more, which can still be over 80%

efficient at outputs of 1.0W or less. The wide dynamic range of

the controller system allows designs with extremely wide line

and load variations with much less difficulty and much higher

efficiency than usual. The exceptionally wide input voltage

range also allows better usage of energy stored in input

dropout capacitors than with other PWM ICs. Remote on/off

controls allow either latching or nonlatching remote shutdown.

During shutdown, the power required is under 6.0mW.

For detailed circuit and application information, please

refer to application notes AN-H13, AN-H21 to AN-H24.

Functional Block Diagram

Note:

Pin numbers in parentheses are for PLCC package.