ISL97678IRZ-TK 데이터 시트보기 (PDF) - Intersil

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ISL97678IRZ-TK

8-Channel 45V 50mA LED Driver

Intersil 

ISL97678

TABLE 1. PROTECTIONS TABLE (Continued)

CASE FAILURE MODE

DETECTION MODE

FAILED CHANNEL ACTION GOOD CHANNELS ACTION

VOUT

REGULATED

BY

7 CH1 LED Open Upper OTP not

CH1 OFF

Circuit but has triggered but VIIN1 >

paralleled Zener VSC

CH2 through CH8 Normal

Highest VF of

CH2 through

CH8

Upper OTP not

CH1 remains ON and has

triggered but VIINx > highest VF, thus VOUT

VSC

increases.

VOUT increases then CH-X

switches OFF. This is an

unwanted shut off and can

be prevented by setting OVP

and/or VSC at an

appropriate level.

VF of CH1

8 Channel-to-

Lower OTP triggered Any channel at below the target current will fault out after Highest VF of

Channel ΔVF too but VIINx < VSC

6 PWM cycles.

CH1 through

high

Remaining channels driven with normal current.

CH8

9 Channel-to-

Upper OTP triggered All channels switched off

Channel ΔVF too but VIINx < VSC

high

Highest VF of

CH1 through

CH8

10 Output LED string VOUT > VOVP

voltage too high

11 VOUT/LX shorted

to GND

Driven with normal current. Any channel that is below the

target current will time-out after 6 PWM cycles.

LX will not switch

Highest VF of

CH1 through

CH8

15

FN6998.1

November 5, 2009

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