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ISL97671A
TABLE 2. PROTECTIONS TABLE
CASE
1
FAILURE MODE
CHx Short Circuit
DETECTION MODE
Upper Over-Temperature
FAILED CHANNEL ACTION
CHx ON and burns power.
GOOD CHANNELS ACTION
Remaining channels normal
V OUT REGULATED
BY
Highest VF of all
Protection limit (OTP) not
triggered and CHx < 7.5V
channels
2
CHx Short Circuit
Upper OTP triggered but
All channels go off until chip cooled
Same as CHx
Highest VF of
CHx < 7.5V
and then comes back on with
current reduced to 76%. Subsequent
OTP triggers will reduce I OUT further.
remaining
channels
3
CHx Short Circuit
Upper OTP not triggered
CHx disabled after 6 PWM cycle
Remaining channels normal
Highest VF of
but CHx > 7.5V
time-outs.
remaining
channels
4
5
CHx Open Circuit with Upper OTP not triggered
infinite resistance and CHx < 7.5V
CHx LED Open Circuit Upper OTP not triggered
V OUT will ramp to OVP. CHx will time- Remaining channels normal
out after 6 PWM cycles and switch
off. V OUT will drop to normal level.
CHx remains ON and has highest VF, Remaining channels ON,
Highest VF of
remaining
channels
VF of CHX
but has paralleled
Zener
and CHx < 7.5V
thus V OUT increases.
remaining channel FETs burn
power
6
CHx LED Open Circuit Upper OTP triggered but
CHx < 7.5V
but has paralleled
All channels go off until chip cooled
and then comes back on with
Same as CHx
VF of CHx
Zener
current reduced to 76%. Subsequent
OTP triggers will reduce I OUT further
7
CHx LED Open Circuit Upper OTP not triggered
but has paralleled but CHx > 7.5V
Zener
CHx remains ON and has highest VF, V OUT increases, then CH-X
thus V OUT increases. switches OFF after 6 PWM cycles.
This is an unwanted shut off and
VF of CHx
can be prevented by setting OVP
at an appropriate level.
8
Channel-to-Channel
Δ VF too high
Lower OTP triggered but
CHx < 7.5V
Any channel below the target current will fault out after 6 PWM cycles.
Remaining channels driven with normal current.
Highest VF of
remaining
channels
9
Channel-to-Channel
Δ VF too high
Upper OTP triggered but
CHx < 7.5V
All channels go off until chip cools and then come back on with current
reduced to 76%. Subsequent OTP triggers will reduce I OUT further
Boost switch OFF
10
Output LED stack
voltage too high
V OUT > VOVP
Any channel that is below the target current will time-out after 6 PWM Highest VF of
cycles, and V OUT will return to the normal regulation voltage required for remaining
other channels. channels
11
V OUT /LX shorted to
GND at start-up or
V OUT shorted in
operation
LX current and timing are The chip is permanently shutdown 31ms after power-up if V OUT /Lx is
monitored. shorted to GND.
OVP pins monitored for
excursions below 20% of
OVP threshold.
16
FN7709.3
November 30, 2012
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