HV9910BLG-G(2007) Ver la hoja de datos (PDF) - Supertex Inc

Número de pieza

componentes Descripción

Fabricante

HV9910BLG-G
(Rev.:2007)

Universal High Brightness LED Driver

Supertex Inc 

HV9910B

Pin Description

Function

VIN

Description

This pin is the input of an 8V – 450V linear regulator.

VDD

This is the power supply pin for all internal circuits.

It must be bypassed with a low ESR capacitor to GND (≥ 0.1μF).

GATE

This pin is the output gate driver for an external N-channel power MOSFET.

GND

Ground return for all internal circuitry. This pin must be electrically connected to the ground of the power

train.

PWMD

This is the PWM dimming input of the IC. When this pin is pulled to GND, the gate driver is turned off.

When the pin is pulled high, the gate driver operates normally.

This pin is the current sense pin used to sense the FET current by means of an external sense resistor.

CS

When this pin exceeds the lower of either the internal 250mV or the voltage at the LD pin, the gate output

goes low.

LD

This pin is the linear dimming input and sets the current sense threshold as long as the voltage at the pin

is less than 250mV (typ).

This pin sets the oscillator frequency. When a resistor is connected between RT and GND, the HV9910B

RT

operates in constant frequency mode. When the resistor is connected between RT and GATE, the IC

operates in constant off-time mode.

NC

No connection

Block Diagram

VIN

Regulator

LD

-

+

CS

+

250mV -

POR

Blanking

RQ

S

Oscillator

GND

RT

PWMD

VDD

GATE

4

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