ISL97671 Intersil, ISL97671 Datasheet - Page 17

• Manufacturer Part Number: ISL97671
• Description: 6-Channel SMBus/I2C or PM Dimming LED Driver
• Manufacturer: Intersil

CASE
10
11
7
8
9
V
V
V
V
IH
IH
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
shorted in
operation
IL
IL
FAILURE MODE
OUT
NOTES:
SMBus/I
SMBDAT
SMBCLK
P
S = start condition
P = stop condition
A = acknowledge
A = not acknowledge
R/W = read enable at high; write enable at low
/LX shorted
t
BUF
2
C Description
OUT
S
t
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.
17
HD:STA
DETECTION MODE
OUT
t
LOW
> VOVP
TABLE 1. PROTECTIONS TABLE (Continued)
t
R
FIGURE 26. SMBUS/I
t
HD:DAT
CH0 remains ON and has
highest VF, thus V
increases.
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
regulation voltage required for other channels.
The chip is permanently shutdown 31mS after power-up if
V
FAILED CHANNEL ACTION
OUT
/Lx is shorted to GND.
ISL97671
OUT
t
HIGH
t
F
further
t
2
OUT
SU:DAT
C INTERFACE
OUT
S
t
SU:STA
will return to the normal
V
switches OFF after 6 PWM
cycles. This is an unwanted
shut off and can be
prevented by setting OVP at
an appropriate level.
GOOD CHANNELS ACTION
OUT
increases, then CH-X
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t
SU:STO
VF of CH0
Highest VF of
CH0 through
CH5
Highest VF of
CH0 through
CH5
Highest VF of
CH0 through
CH5
REGULATED
June 24, 2010
V
P
BY
OUT
FN7631.0