STGIPS35K60L1 Datasheet, PDF (15/21 Pages) STMicroelectronics – Short-circuit rugged IGBTs

STGIPS35K60L1
4
Smart shutdown function
Smart shutdown function
The STGIPS35K60L1 integrates a comparator for fault sensing purposes. The comparator
non-inverting input (C_IN) 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 tri-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}
t(s ^{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
c _{possibility to increase the real disable time without increasing the constant time of the}
du external RC network.
te ^{Pro Figure 9.}
Smart shutdown timing waveforms
comp
Vref
ole _CP+
bs _PROTECTION
) ^{- O HIN/LIN}
t(s _HVG/LVG
roduc SD/OD
upper
P threshold
te ₁
le _{open drain gate}
o _(internal)
Obs Fast shut down:
lower
threshold
2
real disable time
the driver outputs are set in SD state
TIME CONSTANTS
immediately after the comparator
triggering even if the SD signal
has not yet reach
1 = (RON_OD // RSD) CSD
2 = RSD CSD
the lower input threshold
SHUT DOWN CIRCUIT
VBIAS
FROM/TO
CONTROLLER
RSD
SD/OD
CSD
RON_OD
SMART
SD
LOGIC
Pls refer to Table 12 for internal propagation delay time details.
Doc ID 018864 Rev 3
15/21