L6390 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6390' PDF : 22 Pages View PDF
Smart shut down function
7
Smart shut down function
L6390
L6390 integrates a comparator committed to the fault sensing function. The comparator has
an internal voltage reference Vref connected to the inverting input, while the non-inverting
input is available on pin 10. The comparator input can be connected to an external shunt
resistor in order to implement a simple over-current detection function. The output signal of
the comparator is fed to an integrated MOSFET with the open drain output available on pin
2, shared with the SD input. When the comparator triggers, the device is set in shut down
state and both its outputs are set to low level leaving the half-bridge in tri-state.
Figure 5.
Smart shut down timing waveforms
comp
Vref
CP+
HIN/LIN
HVG/LVG
PROTECTION
SD/OD
upper
threshold
lower
threshold
1
2
open drain gate
(internal)
Fast shut down:
the driver outputs are set in SD state
immediately after the comparator
triggering even if the SD signal
has not yet reach
the lower input threshold
real disable time
TIME CONSTANTS
1 = (RON_OD // RSD)
2 = RSD CSD
CSD
SHUT DOWN CIRCUIT
VBIAS
FROM/TO
CONTROLLER
RSD
SD/OD
CSD
RON_OD
SMART
SD
LOGIC
14/22
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