ISL97672 Intersil, ISL97672 Datasheet - Page 13

• Manufacturer Part Number: ISL97672
• Description: 6-Channel LED Driver
• Manufacturer: Intersil

CASE FAILURE MODE
10
11
5
6
7
8
9
CH0 LED Open
Circuit but has
paralleled Zener
CH0 LED Open
Circuit but has
paralleled Zener
CH0 LED Open
Circuit but has
paralleled Zener
Channel-to-
Channel
ΔVF too high
Channel-to-
Channel ΔVF too
high
Output LED stack
voltage too high
V
to GND at start-up
or V
operation
OUT
OUT
/LX shorted
shorted in
Upper OTP not
triggered and CH0
< 4V
Upper OTP
triggered but CH0
< 4V
Upper OTP not
triggered but CHx
> 4V
Lower OTP
triggered but CHx
< 4V
Upper OTP
triggered but CHx
< 4V
V
LX current and
timing are
monitored.
OVP pins
monitored for
excursions below
20% of OVP
threshold.
OUT
13
DETECTION
> VOVP
MODE
TABLE 1. PROTECTIONS TABLE (Continued)
CH1 remains ON and has
highest VF, thus V
All channels go off until chip
cooled and then comes back on
with current reduced to 76%.
Subsequent OTP triggers will
reduce I
CH0 remains ON and has
highest VF, thus V
Any channel at below the target current will fault out after 6 PWM
cycles.
Remaining channels driven with normal current.
All channels go off until chip cooled and then comes back on with
current reduced to 76%. Subsequent OTP triggers will reduce
I
Any channel that is below the target current will time-out after 6
PWM cycles, and V
voltage required for other channels.
The chip is permanently shutdown 31mS after power-up if
V
OUT
OUT
FAILED CHANNEL ACTION
/Lx is shorted to GND.
further
OUT
ISL97672
further
OUT
OUT
OUT
increases.
increases.
will return to the normal regulation
CH1 through CH5 ON, Q1
through Q5 burn power
Same as CH0
V
switches OFF after 6 PWM
cycles. This is an unwanted
shut off and can be prevented
by setting OVP at an
appropriate level.
OUT
GOOD CHANNELS ACTION
increases, then CH-X
www.DataSheet4U.com
REGULATED BY
VF of CH0
VF of CH0
VF of CH0
Highest VF of
CH0 through
CH5
Highest VF of
CH0 through
CH5
Highest VF of
CH0 through
CH5
June 24, 2010
V
OUT
FN7632.0