L6520, L6521 Functions description
Doc ID 16998 Rev 3 13/19
5.8 Summary of protections
Figure 3. Summary of protections
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Table 7. Table of faults
Fault
Active during
Condition Ic behaviour
Required
action
PH Ign Run
Minimum
driving pulse
duration
9 Driving pulses shorter than 1 µs
- The drivers are stopped after
200 ms of minimum pulse
duration events
- The IC is shut down in low
consumption mode
V
CC
cycle
Inductor
saturation
99
HBCS TxL and TxM thresholds
crossed in less than 255 ns
OR
Higher threshold crossing
LS driver turned off and a new
frequency is calculated.
If the situation is not recovered
after 200 ms, the IC is shut down
in low consumption mode
V
CC
cycle
Hard switching
9
PWM_det higher than 2.35 V at
LSD turn on
IC is shut down in low
consumption mode after 200 ms
of HSW events
V
CC
cycle
Overcurrent
99
HBCS TxL and TxM thresholds
crossing (different values during
ignition or run mode)
Frequency increase proportional
to the failure.
If the situation is not recovered
after 200 ms the IC is shut down
in low consumption mode
V
CC
cycle
End Of Life 9
EOL voltage outside the limits of
the window comparator
- Delay time started
- If EOL voltage is outside the
limits of the window comparator at
the end of the timer count than
the IC is shut down (latched)
V
CC
cycle
