ISL97671 Intersil, ISL97671 Datasheet - Page 16

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

CASE
1
2
3
4
5
6
CH0 Short Circuit
CH0 Short Circuit
CH0 Short Circuit
CH0 Open Circuit
with infinite
resistance
CH0 LED Open
Circuit but has
paralleled Zener
CH0 LED Open
Circuit but has
paralleled Zener
FAILURE MODE
REG
VSET/2
V
IN
IMAX
DRIVER
Upper
Over-Temperature
Protection limit (OTP)
not triggered and CH0
< 4V
Upper OTP triggered
but VCH0 < 4V
Upper OTP not
triggered but CH0 >
4V
Upper OTP not
triggered and CH0 <
4V
Upper OTP not
triggered and CH0 <
4V
Upper OTP triggered
but CH0 < 4V
16
DETECTION MODE
ILIMIT
REGISTER
FAULT/
STATUS
FAULT
FIGURE 25. SIMPLIFIED FAULT PROTECTIONS
LOGIC
SMBUS/I
TABLE 1. PROTECTIONS TABLE
CONTROL
LOGIC
DRIVER
CH0 ON and burns power.
All channels go off until chip
cooled and then comes back on
with current reduced to 76%.
Subsequent OTP triggers will
reduce I
CH1 disabled after 6 PWM cycle
time-out.
V
time-out after 6 PWM cycles
and switch off. V
to normal level.
CH1 remains ON and has
highest VF, thus V
increases.
All channels go off until chip
cooled and then comes back on
with current reduced to 76%.
Subsequent OTP triggers will
reduce I
SHORT
FAILED CHANNEL ACTION
OUT
O/P
FET
THRM
THRM
SHDN
SHDN
OTP
OTP
2
C
will ramp to OVP. CH1 will
ISL97671
PWM/OC0/SC0
OUT
OUT
VSET
further.
further
LX
VSC
VSC
LX
DC CURRENT
OUT
+
-
OUT
OVP
will drop
T2
T1
SENSOR
REF
TEMP
V
Q0
OUT
CH1 through CH5 Normal
Same as CH0
CH1 through CH5 Normal
CH1 through CH5 Normal
CH1 through CH5 ON, Q1
through Q5 burn power
Same as CH0
PWM/OC5/SC5
GOOD CHANNELS ACTION
CH0
VSET
+
-
Q5
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CH5
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
VF of CH0
REGULATED
June 24, 2010
V
BY
OUT
FN7631.0