ISL97634 データシートの表示（PDF） - Intersil

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ISL97634

White LED Driver with Wide PWM Dimming Range

Intersil 

Block Diagram

VIN (2.4V TO 5.5V)

CIN

VIN

1.4MHZ OSCILLATOR AND RAMP

GENERATOR

ISL97634

L

PWM/EN

ISL97634

PWM

COMPARATOR

PWM LOGIC

CONTROLLER

FET

DRIVER

LX

VOUT

CURRENT

SENSE

GM AMP

COMPENSATION

GM

AMPLIFIER

95mV

GND

FBSW

PWM/EN

FB

BANDGAP

REFERENCE

GENERATOR

COUT

2 LEDs to 7 LEDS

RSET

Pin Description

PIN NUMBER

1

2

3

PIN NAME

GND

VIN

PWM/EN

4

NC

5

FB

6

FBSW

7

VOUT

8

LX

DESCRIPTION

Ground Pin. Connect to local ground.

Input Supply Pin. Connect to the input supply voltage, the inductor and the input supply decoupling capacitor.

PWM or Enable Pin. Connect external PWM signal allows pulse width modulation current operation. Enable

signal allows peak current operation or disable signal shuts down the device.

No Connect

Feedback Pin. Connect the sense resistor between FB and ground. The cathode of bottom LED can also

be connected at this pin if the output current is not to be PWMed.

FB Disconnect Switch. Connect to the cathode of the bottom LED if the output current to be PWMed.

Output Pin. Connect to the anode of the top LED and the output filter capacitor.

Switching Pin. Connect to inductor.

3

FN6264.3

March 7, 2008

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