STGAP2SCMTR datasheet(9/23 Pages) STMICROELECTRONICS

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5.3

Control inputs

The device is controlled through the IN+ and IN- logic inputs, in accordance to the truth table

described in Table 9.

Table 9. Inputs truth table (applicable when device is not in UVLO or “safe state”)

Input pins

Output pins

IN+

IN-

GON

GOFF

OFF

Adeglitch filter allow the input pins to ignore signals with duration shorter than tdeglitch, so preventing noise spikes

possibly present in the application from generating unwanted commutations.

5.4

Miller clamp function

The Miller clamp function allows the control of the Miller current during the power stage switching in half-bridge

configurations. When the external power transistor is in the OFF state, the driver operates to avoid the induced

turn-on phenomenon that may occur when the other switch in the same leg is being turned on, due to the CGD

capacitance.

During the turn-off period the gate of the external switch is monitored through the CLAMP pin. The CLAMP switch

is activated when gate voltage goes below the voltage threshold. VCLAMPth, thus creating a low impedance path

between the switch gate and the GNDISO pin.

5.5

Watchdog

The isolated HV side has a watchdog function in order to identify when it is not able to communicate with LV side,

for example because the VDD of the LV side is not supplied. In this case the output of the driver is forced in “safe

state” until communication link is properly established again.

5.6

Thermal shutdown protection

The device provides a thermal shutdown protection. When junction temperature reaches the TSD temperature

threshold, the device is forced in “safe state”. The device operation is restored as soon as the junction

temperature is lower than TSD - Thys.

STGAP2S

Control inputs

DS12541 - Rev 3

page 9/23

STGAP2SCMTR Folha de dados(PDF) 9 Page - STMicroelectronics