L6390_12 STMICROELECTRONICS [STMicroelectronics], L6390_12 Datasheet - Page 14

• Manufacturer Part Number: L6390_12
• Description: High-voltage high/low-side driver
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Smart shutdown function
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Smart shutdown function
The L6390 integrates a comparator committed to the fault sensing function. The comparator
has an internal voltage reference V
inverting input is available on pin 10. The comparator input can be connected to an external
shunt resistor in order to implement a simple overcurrent 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 shutdown state and both its outputs are set to low level leaving the half-bridge in tri-state.
Figure 6.
CONTROLLER
FROM/TO
V
BIAS
Smart shutdown timing waveforms
SHUT DOWN CIRCUIT
R
C
SD
SD
SD/OD
HIN/LIN
HVG/LVG
SD/OD
open drain gate
comp Vref
CP+
(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
R
PD_SD
R
ON_OD
Doc ID 14493 Rev 7
:
ref
connected to the inverting input, while the non-
SMART
LOGIC
SD
PROTECTION
disable time
An approximation of the disable time is given by:
where:
AM12947v1
L6390