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ISL97675

4-Channel LED Driver with Phase Shift Control

Intersil 

Block Diagram

VIN* = 4.5V~26V

VIN

EN

VDDIO

REG

4.75V BIAS

OPTIONAL PFET

10µH/3A

FAULT

FAULT

FET

DRV

ISL97675

O/P SHORT

45V*/30mA PER STRING

48 (4x12) LEDS

4.7µF/50V

SW

OVP

OVP

FSW/

PHASESHIFT

COMP

OSC &

RAMP

COMP

FSW

DETECT

PHASE

SELECT

GM

AMP

Σ =0

IMAX

ILIMIT

LOGIC

FET

DRIVER

8-BIT

DAC

DYNAMIC

HEADROOM

CONTROL

FPO

HIGHEST VF

STRING

DETECT

ISET

GND

+

-

REF OVP

REF VSC

REF

GEN

VSET

+

-

+

-

PWM

FPWM/DirectPWM

PHASE

SELECT

8-BIT

DIGITIZER

PHASE

SHIFT &

PWM

CONTROLLER

DIRECTPWM

DETECT

PGND

OPEN CKT, SHORT CKT

DETECTS

FB1

FB2

FB4

1

TEMP

SENSOR

SHUTDOWN

2

* VIN ≥ 6V

+

4

-

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