HV9912NG-G 데이터 시트보기 (PDF) - Supertex Inc

부품명

상세내역

제조사

HV9912NG-G

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

Supertex Inc 

HV9912

Functional Block Diagram

VIN

VDD

CLIM

CS

1:2

Linear Regulator

+_

5.60/6.10V

_

+

Blanking

TBLANK

ramp

SC

COMP

FDBK

IREF

POR OVD SCD

Hiccup/Dimming

13R

Block

R

PWMD

SS

_

+GM

2

Vbg

SS

POR

R

Q

S

SS

OVPD

REF

GATE

FAULT

5V rising

4.5V falling

OVP

TBLANK,SC

PWMD

PWMD

SCD

One Shot

GND

SYNC

RT

Functional Description

Power Topology

The HV9912 is a switch-mode converter LED driver de-

signed to control a continuous conduction mode buck or

boost in a constant frequency (or constant off-time) mode.

The IC includes an internal linear regulator, which operates

from input voltages up to 90V eliminating the need for an

external power supply for the IC. The IC includes features

typically required in LED drivers like open LED protection,

output short circuit protection, linear and PWM dimming,

programmable input current limiting and accurate control of

the LED current. A high current gate drive output enables the

controller to be used in high power converters.

The HV9912 is an enhanced version of the HV9911 with

hysteretic over-voltage protection and hiccup mode short

circuit protection. The IC includes a blanking network con-

trolled by the PWMD input to prevent the short circuit protec-

tion from triggering prematurely during PWM dimming due

to the parasitic capacitance of the LED string. It also allows

the IREF pin to be pulled all the way down to GND without

triggering the short circuit protection. It is a pin compatible

replacement to the HV9911.

Linear Regulator

The HV9912 can be powered directly from its VIN pin that

withstands a voltage up to 90V. When a voltage is applied at

the VIN pin, the HV9912 tries to maintain a constant 7.75V

(typ) at the VDD pin. The regulator also has a built in under-

voltage lockout which shuts off the IC if the voltage at the

VDD pin falls below the UVLO threshold.

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

5

Share Link: