BD9A300MUV
2. Protection
The protective circuits are intended for prevention of damage caused by unexpected accidents. Do not use them
for continuous protective operation.
(1) Short Circuit Protection (SCP)
The short circuit protection block compares the FB terminal voltage with the internal reference voltage VREF.
When the FB terminal voltage has fallen below 0.4V(Typ) and remained there for 1msec(Typ), SCP stops
the operation for 16msec(Typ) and subsequently initiates a restart.
Short Circuit
Protection
Short Circuit
Protection Operation
EN Terminal
FB Terminal
< 0.4V(Typ)
> 0.4V(Typ)
-
ON
OFF
OFF
2.0V or Higher
0.8V or Lower
Enabled
Disabled
Soft start
1msec (Typ)
VOUT
SCP delay time
1msec (Typ)
SCP delay time
1msec (Typ)
0.8V
FB terminal
SCP threshold voltage:
0.4V(Typ)
SCP release
Upper
MOSFET gate
LOW
LOW
Lower
MOSFET gate
OCP
threshold
6.0A(Typ)
Coil current
(Output load
current)
Build-in IC
HICCUP
Delay signal
16msec (Typ)
SCP reset
Figure 46. Short Circuit Protection (SCP) Timing Chart
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TSZ02201-0J3J0AJ00350-1-2
30.Jun.2017 Rev.003
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