ISL97673IRZ 查看數據表（PDF） - Renesas Electronics

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ISL97673IRZ

6-Channel SMBus or PWM Dimming LED Driver with Phase Shift Control

Renesas Electronics 

ISL97673

VIN

DRIVER

FAULT

IMAX ILIMIT LOGIC

O/P

SHORT

FET

DRIVER

LX

OVP

VSC

VOUT

CH0

VSET/2

REG

FAULT/

STATUS

REGISTER

THRM

SHDN

REF

OTP

T2

TEMP

SENSOR

T1

VSET +

Q0 VSET

+

-

-

SMB/I2C

CONTROL

LOGIC

PWM/OC0/SC0

DC CURRENT

PWM/OC5/SC5

FIGURE 24. SIMPLIFIED FAULT PROTECTIONS

CH5

Q5

TABLE 2. PROTECTIONS TABLE

CASE FAILURE MODE DETECTION MODE FAILED CHANNEL ACTION

GOOD CHANNELS

ACTION

1 CH0 Short Circuit Upper

CH0 ON and burns power.

Over-Temperature

Protection limit (OTP)

not triggered and CH0

< 4V

CH1 through CH5 Normal

2 CH0 Short Circuit Upper OTP triggered All channels go off until chip Same as CH0

but VCH0 < 4V

cooled and then comes back

on with current reduced to

76%. Subsequent OTP

triggers will reduce IOUT

further.

3 CH0 Short Circuit Upper OTP not

triggered but

CH0 > 4V

CH1 disabled after 6 PWM

cycle time-out.

CH1 through CH5 Normal

4 CH0 Open Circuit Upper OTP not

with infinite

triggered and

resistance

CH0 < 4V

VOUT will ramp to OVP. CH1

will time-out after 6 PWM

cycles and switch off. VOUT

will drop to normal level.

CH1 through CH5 Normal

5 CH0 LED Open

Upper OTP not

Circuit but has

triggered and

paralleled Zener CH0 < 4V

CH1 remains ON and has

highest VF, thus VOUT

increases.

CH1 through CH5 ON, Q1

through Q5 burn power

VOUT

REGULATED

BY

Highest VF of

CH1 through

CH5

Highest VF of

CH1 through

CH5

Highest VF of

CH1 through

CH5

Highest VF of

CH1 through

CH5

VF of CH0

FN7633 Rev.3.00

Sep 19, 2017

Page 16 of 28

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