BM28723AMUV
13 Protection Function - continued
13.1 Output Short Protection (Short to the Power Supply)
This LSI has the output short protection circuit that mutes the PWM output when the PWM output is short-circuited to the
power supply unintentionally.
Detecting condition - It will detect when MUTEX pin is set high and the current that flows in the PWM output pin
becomes over 10A (Typ) more than 0.3μs (Typ). The PWM output immediately transition to the
state of High-Z_low if detected, and LSI does the latch.
Releasing method - Set MUTEX pin to low once for more than PWM stop time (Refer to P.19) and then return it back
to high.
Short to VCC
Release from short to VCC
OUT1P (25pin)
OUT1N (21pin)
OUT2P (20pin)
OUT2N (16pin)
t
Normal operation after released
from Latch state.
PWM out： IC latches
with High-Z_low.
Over current
10A(Typ)
t
PWM stop time
ERRORX (13pin)
t
t
0.3µs(Typ)
MUTEX(30pin)
Latch release
Figure 45. Output Short Protection (Short to the power supply) Sequence
13.2 Output Short Protection (Short to GND)
This LSI has the output short protection circuit that mutes the PWM output when the PWM output is short-circuited to
GND unintentionally.
Detecting condition - It will detect when MUTEX pin is set high and the current that flows in the PWM output pin
becomes over 10A (Typ) more than 0.4μs (Typ). If Output short protection is detected, the
PWM output immediately transition to the state of High-Z_low, and LSI latches the stop state.
Releasing method - Set MUTEX pin to low once for more than PWM stop time (Refer to P.19) and then return it back
to high.
Short to GND
Release from short to GND
OUT1P (25pin)
OUT1N (21pin)
OUT2P (20pin)
OUT2N (16pin)
t
Normal operation after released
from latch state.
PWM out: IC latches with High -
Z_low state.
Over current
10A(Typ)
t
PWM stop time
ERRORX (13pin)
t
0.4µs(Typ)
MUTEX（30pin）
Latch release
t
Figure 46. Output Short Protection (Short to GND) Sequence
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TSZ02201-0C1C0E900720-1-2
31.Aug.2018 Rev.001
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