6.3

Control inputs

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

following Table 9

Table 9. STGAP2GS inputs truth table (applicable when device is not in UVLO or "safe state")

Input pins

Output pins

IN+

IN-

GON

GOFF

L

L

OFF

ON

H

L

ON

OFF

L

H

OFF

ON

H

H

OFF

ON

6.4

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.

6.5

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.

6.6

Standby function

In order to reduce the power consumption of both control interface and gate driving sides the device can be put in

standby mode. In standby mode the quiescent current from VDD and VH supply pins is reduced to IQDDSBY and

IQHSBY respectively, and the output remains in “safe state” (the output is actively forced low).

The way to enter standby is to keep both IN+ and IN- high (“standby” value) for a time longer than tSTBY. During

standby the inputs can change from the “standby” value.

To exit standby, IN+ and IN- must be put in any combination different from the “standby” value for a time longer

than tstbyfilt, and then in the “standby” value for a time t such that tWUP < t < tSTBY.

When the input configuration is changed from the “standby” value the output is enabled and set according to

inputs state after a time tawake.

Figure 4. Standby state sequences

Sequence to enter stand-by mode

Sequence to exit stand-by mode

IN+ & IN-

Device status

Output

ACTIVE

STAND-BY

SAFE-STATE

ACTIVE

“stand-by”

“stand-by”

duration too short

IN+ & IN-

Device status

Output

ACTIVE

STAND-BY

SAFE-STATE

ACTIVE

ACTIVE

ACTIVE

“stand-by”

“stand-by”

“stand-by”

“stand-by”

duration

too short

duration too long

“stand-by”: IN+ = IN- = HIGH

is any different combination

t = tSTBY

t < tSTBY

t = tSTBY

t > tSTBY

t = tawake

t > tstbyflt t < tWUP

tWUP< t < tSTBY

STGAP2GS

Control inputs

DS14152 - Rev 1

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