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ISL97635A
subsequently falls below 20% of the target OVP level, the
input protection FET will also be switched off.
Over-Temperature Protection (OTP)
The ISL97635A includes two over-temperature thresholds.
The lower threshold is set to +130°C. When this threshold is
reached, any channel which is outputting current at a level
significantly below the regulation target will be treated as
“open circuit” and disabled after a time-out period. This
time-out period is also reduced to 800μs when it is above the
lower threshold. The intention of the lower threshold is to
allow bad channels to be isolated and disabled before they
cause enough power dissipation (as a result of other
channels having large voltages across them) to hit the upper
temperature threshold.
The upper threshold is set to +150°C. Each time this is
reached, the boost will stop switching and the output current
sources will be switched off. Once the device has cooled to
approximately +100°C, the device will restart with the DC
LED current level reduced to 77% of the initial setting. If the
dissipation problem persists, subsequent hitting of the limit
will cause identical behavior, with the current reduced in
steps to 53% and finally 30%. Hitting of the upper threshold
will also set the thermal fault bit of the Fault/Status register
0x02. Unless disabled via the EN pin, the device stays in an
active state throughout, allows the external processor to
interrogate the fault condition.
For the extensive fault protection conditions, please refer to
Figure 18 and Table 1 for details.
VIN
LX
VOUT
DRIVER
FAULT
O/P
SHORT
LX
OVP
IMAX
ILIMIT
LOGIC
FET
DRIVER
VSC
IIN0
IIN5
VSET/2
REG
THRM
SHDN
OTP
REF
T2
TEMP
SENSOR
T1
VSET
+
Q0 VSET
+
Q5
PWM/OC0/SC0
-
-
PWM/OC5/SC5
FAULT/
STATUS
SMBUS
CONTROL
REGISTER
LOGIC
DC CURRENT
FIGURE 18. SIMPLIFIED FAULT PROTECTIONS
15
FN6564.2
December 22, 2008
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