ISL97635A datasheet(16/29 Pages) RENESAS

16 / 29 page

ISL97635A

FN6564 Rev.3.00

Page 16 of 29

Sep 26, 2017

6CH0 LED Open Circuit

but has paralleled

Zener

Upper OTP triggered

but VIIN0 < VSC

CH0 goes off until chip cooled and

then comes back on with current

reduced to 76%. Further OTP triggers

result in reduction to 53%, then 30%.

Thermal event reported in

Fault/Status Register.

Same as CH0

VF of CH0

7CH0 LED Open Circuit

but has paralleled

Zener

Upper OTP not

triggered but VIIN0

> VSC

CH0 OFF

CH1 through CH5 Normal

Highest VF of CH1

through CH5

Upper OTP not

triggered but VIINx

> VSC

CH0 remains ON and has highest VF,

thus VOUT 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 CH0

Channel-to-Channel

VF too high

Lower OTP

triggered but VIINx

< VSC

Any channel at below 50% of the target current will fault out after 400µs.

Remaining channels driven with normal current.

Highest VF of CH0

through CH5

Channel-to-Channel

VF too high

Upper OTP triggered

but VIINx < VSC

All channels switched off until chip cooled and then comes back on with

current reduced to 76%. Further OTP triggers result in reduction to 53%, then

30%. Thermal event reported in Fault/Status Register.

Highest VF of CH0

through CH5

Output LED stack

voltage too high

VOUT > VOVP

Driven with normal current. Any channel that is below 50% of the target

current will time-out after 6ms.

Highest VF of CH0

through CH5

VOUT/LX shorted to

GND

LX current and

timing are

monitored.

OVP pin monitored

for excursions

below 20% of OVP

threshold

Fault switch disabled and system shutdown until fault goes away, VOUT is

checked at startup with a low current from LX to check for presence of short

before the fault switch is enabled.

TABLE 1. PROTECTIONS TABLE (Continued)

CASE

FAILURE MODE

DETECTION MODE

FAILED CHANNEL ACTION

GOOD CHANNELS ACTION

VOUT REGULATED BY

FIGURE 20. SMBUS INTERFACE

VIH

VIL

VIH

VIL

tLOW

tHD:STA

tHD:DAT

tHIGH

tSU:DAT

tSU:STA

tSU:STO

SMBDAT

SMBCLK

NOTES:

SMBus Description

S = start condition

P = stop condition

A = acknowledge

A = not acknowledge

R/W = read enable at high; write enable at low

tBUF

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