HV9912 데이터 시트보기 (PDF) - Supertex Inc

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HV9912

Switch-mode LED Driver IC With High Current Accuracy and Hiccup Mode Protection

Supertex Inc 

HV9912

Switch-mode LED Driver IC

With High Current Accuracy and Hiccup Mode Protection

Features

► Switch mode controller for single switch

drivers

♦ Buck

♦ Boost

♦ Buck-boost and SEPIC

► Works with high side current sensors

► Closed loop control of output current

► High PWM dimming ratio

► Internal 90V linear regulator (can be

extended using external Zener diodes)

► Internal 2% voltage reference

(0°C < TA < 85°C)

► Constant frequency operation

► Programmable slope compensation

► Linear & PWM dimming

► +0.2A/-0.4A gate drive

► Hiccup mode protection for both short circuit

and open circuit conditions

► Synchronization capability

► Pin compatible with HV9911

Applications

► LED backlight applications

► General LED lighting applications

► Battery powered LED lamps

General Description

The HV9912 is a current mode control LED driver IC designed

to control single switch PWM converters (buck, boost, buck-boost

or SEPIC) in a constant frequency mode. The controller uses a

peak current-mode control scheme with programmable slope

compensation and includes an internal transconductance amplifier

to control the output current in closed loop enabling high output

current accuracy (in the case of buck and buck-boost converters,

the output current can be sensed using a high side current sensor

like the HV7800). In the constant frequency mode, multiple HV9912

ICs can by synchronized to each other or to an external clock using

the SYNC pin. Programmable MOSFET current limit enables

current limiting during input under voltage and output overload

conditions. The IC also includes a 0.2A source and 0.4A sink gate

driver that makes the HV9912 suitable for high power applications.

An internal 90V linear regulator powers the IC eliminating the need

for a separate power supply for the IC. The IC also provides a

FAULT output, which can be used to disconnect the LEDs in case

of a fault condition using an external disconnect FET. HV9912 also

provides a TTL compatible, low-frequency PWM dimming input that

can accept an external control signal with a duty ratio of 0-100%

and a frequency of up to a few kilohertz. The HV9912 includes

hiccup protection from both short and open circuits, with automatic

recovery after the fault condition is cleared.

The HV9912 is a pin compatible replacement to Supertex’s HV9911.

It is compatible with existing HV9911 designs which have an input

voltage of less than 90V by changing ROVP1, ROVP, and RT.

Typical Application Circuit - Boost

VIN

CIN

CDD

1 VIN

2 VDD

D2

L1

Q1

GATE 3

CS 5

RSC

D1

ROVP1

RCS

ROVP2

CO

CREF

4 GND

OVP 12

RSLOPE

RT

6 SC

7 RT

FAULT 11

HV9912

FDBK 16

10 REF

CC

COMP 14

Q2

Rs

9 CLIM

RL1

RL2

RR1

15 IREF

RR2

PWMD 13

SYNC 8

● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

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