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ISL97691
FIGURE 24. EXAMPLE OF PCB LAYOUT
Fault Protection and Monitoring
The ISL97691 features extensive protection functions to handle
failure conditions automatically. Refer to Figure 15 and Table 3
for details of the fault protections.
The LED failure mode is either open or short circuit. An open
circuit failure of an LED only results in the loss of one channel of
LEDs without affecting other channels. Similarly, a short circuit
condition on a channel that results in that channel being turned
off does not affect other channels.
Due to the lag in boost response to any load change at its output,
certain transient events (such as LED current steps or significant
step changes in LED duty cycle) can transiently look like LED
fault modes. The ISL97691 uses feedback from the LEDs to
determine when it is in a stable operating region and prevents
apparent faults during these transient events from allowing any
of the LED stacks to fault out. See Table 3 for more details.
Short Circuit Protection (SCP)
The short circuit detection circuit monitors the voltage on each
channel and disables faulty channels which are above the short
circuit protection threshold, nominally 8V (the action taken is
described in Table 3).
16
Open Circuit Protection (OCP)
When one of the LEDs becomes open circuit, it can behave as
either an infinite resistance or a gradually increasing finite
resistance. The ISL97691 monitors the current in each channel
such that any string which reaches the intended output current is
considered “good”. Should the current subsequently fall below the
target, the channel will be considered an “open circuit”.
Furthermore, should the boost output of the ISL97691 reach the
V OVP limit, all channels which are not “good” will immediately be
considered as “open circuit”.
Detection of an “open circuit” channel will result in a time-out
before disabling of the affected channel.
Undervoltage Lockout
If the input voltage falls below the V UVLO level of ~2.15V, the
ISL97691 will stop switching and be reset. Operation will restart
only if the V IN is back in the normal operating range.
Over-Temperature Protection (OTP)
The ISL97691 has an over-temperature protection threshold set to
+150°C. If this threshold is reached, the boost stops switching
and the channel output current sinks are switched off. The
ISL97691 can be restarted by toggling V IN to below the V UVLO level
of ~2.15V, then back up to the normal input voltage level.
FN7840.1
February 1, 2013
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