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ISL97671
TABLE 1. PROTECTIONS TABLE (Continued)
CASE
FAILURE MODE
DETECTION MODE
FAILED CHANNEL ACTION
GOOD CHANNELS ACTION
V OUT REGULATED
BY
6
CH0 LED Open Circuit Upper OTP triggered but
CH0 < 4V
but has paralleled
All channels go off until chip cooled
and then comes back on with
Same as CH0
VF of CH0
Zener
current reduced to 76%. Subsequent
OTP triggers will reduce I OUT further
7
CH0 LED Open Circuit Upper OTP not triggered
but has paralleled but CHx > 4V
Zener
CH0 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 CH0
can be prevented by setting OVP
at an appropriate level.
8
Channel-to-Channel
Lower OTP triggered but
Any channel at below the target current will fault out after 6 PWM cycles. Highest VF of
Δ VF too high
CHx < 4V
Remaining channels driven with normal current.
CH0 through CH5
9
Channel-to-Channel
Upper OTP triggered but
All channels go off until chip cooled and then comes back on with current Highest VF of
Δ VF too high
CHx < 4V
reduced to 76%. Subsequent OTP triggers will reduce I OUT further
CH0 through CH5
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 CH0 through CH5
other 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.
SMBCLK
t LOW
t R
t F
V IH
V IL
t HD:STA
t HD:DAT
t HIGH
t SU:DAT
t SU:STA
t SU:STO
SMBDAT
V IH
V IL
P
t BUF
S
S
P
NOTES:
SMBus/I 2 C Description
S = start condition
P = stop condition
A = acknowledge
A = not acknowledge
R/W = read enable at high; write enable at low
FIGURE 26. SMBUS/I 2 C INTERFACE
16
FN7631.3
August 14, 2012
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