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ISL97677
capacitors reduce the AC impedance of the OVP node,
which is important when using high value resistors.
Undervoltage Lockout
If the input voltage falls below the UVLO level of 2.8V, the
device will stop switching and be reset. Operation will
restart only if the device control interface re-enables it
once the input voltage is back in the normal operating
range. Also all digital settings will be reset to their default
states.
Over-Temperature Protection (OTP)
The ISL97677 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. 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 and stay off until the
control interface disables and re-enables it. Hitting of the
upper threshold will also set the thermal fault bit of the
Fault/Status register 0x02. Unless disabled via the /SHUT
pin, the device stays in an active state throughout,
allowing the external processor to interrogate the fault
condition.
For the extensive fault protection conditions, please refer
to Figure 25 and Table 1 for details.
Shutdown
When the EN pin is low the entire chip is shut down to
give close to zero shutdown current. The digital
interfaces will not be active during this time.
VIN
LX
VOUT
DRIVER
IMAX ILIMIT
FAULT
LOGIC
O/P
SHORT
FET
DRIVER
LX
OVP
VSET/2
VSC
CH1
CH8
REG
THRM
SHDN
OTP
REF
T2
TEMP
SENSOR
T1
VSET
+
Q1 VSET
+
Q8
-
-
FAULT/
STATUS
REGISTER
SMBUS
CONTROL
LOGIC
PWM1/OC1/SC1
DC CURRENT
PWM8/OC8/SC8
FIGURE 25. SIMPLIFIED FAULT PROTECTIONS
14
FN6996.1
November 13, 2009
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