STGIPN3H60 STMicroelectronics, STGIPN3H60 Datasheet - Page 14

• Manufacturer Part Number: STGIPN3H60
• Manufacturer: STMicroelectronics

Smart shutdown function
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Smart shutdown function
The STGIPN3H60 integrates a comparator for fault sensing purposes. The comparator non-
inverting input (CIN) can be connected to an external shunt resistor in order to implement a
simple overcurrent protection function. When the comparator triggers, the device is set in
shutdown state and both its outputs are set to low-level leading the half bridge in 3-state. In
the common overcurrent protection architectures the comparator output is usually
connected to the shutdown input through a RC network, in order to provide a mono-stable
circuit, which implements a protection time that follows the fault condition. Our smart
shutdown architecture allows to immediately turn-off the output gate driver in case of
overcurrent, the fault signal has a preferential path which directly switches off the outputs.
The time delay between the fault and the outputs turn-off is no more dependent on the RC
values of the external network connected to the shutdown pin. At the same time the internal
logic turns on the open-drain output and holds it on until the shutdown voltage goes below
the logic input lower threshold. Finally the smart shutdown function provides the possibility
to increase the real disable time without increasing the constant time of the external RC
network.
Figure 6.
Please refer to
Table 12
Smart shutdown timing waveforms
for internal propagation delay time details.
the driver outputs are set in SD state
immediately after the comparator
triggering even if the SD signal
Doc ID 018957 Rev 1
the lower input threshold
open drain gate
HVG/LVG
(internal)
HIN/LIN
comp
SD/OD
threshold
threshold
Vref
CP+
upper
lower
has not yet reach
Fast shut down:
CONTROLLER
FROM/TO
1
SHUT DOWN CIRCUIT
V
BIAS
R
C
SD
SD/OD
SD
PROTECTION
real disable time
R
TIME CONSTANTS
ON_OD
1
2
= (R
= R
SD
ON_OD
SMART
LOGIC
C
SD
SD
// R
2
SD
)
C
SD
STGIPN3H60