STGAP1ASTR datasheet(34/70 Pages) STMICROELECTRONICS

34 / 70 page

Functional description

STGAP1AS

34/70

DocID029344 Rev 2

7.10.1

Always

The 2LTO is performed at each turn-off transition (2LTO_EN = '1').

When 2LTO is used at each transition the minimum on or off pulse width is determined by

2LTO time. Some sample waveforms are given in Figure 14 and Figure 15, where INAND

represents the condition: < IN+ = 'H' and IN- = 'L' >.

If a turn-on pulse is shorter than t2LTOtime it shall be ignored; turn-on pulses longer than

t2LTOtime will determine a delay in the turn-on equal to t2LTOtime (see Figure 14).

Figure 14. Example of short turn-on pulses when 2LTO occurs at each cycle

When a turn-off pulse is detected the turn-off procedure starts immediately by forcing the

V2LTOth voltage on the GOFF pin. If the duration of the turn-off pulse is shorter than t2LTOtime

the turn-off sequence is aborted by setting GOFF in high impedance and turning GON on

again (see Figure 15).

Figure 15. Example of short turn-off pulse when 2LTO occurs at each cycle

When the 2LTO is used at each cycle, any event that forces the device to enter in “safe

state” generates a driver switch off performing a 2LTO sequence.

7.10.2

Fault

The 2LTO is performed only after a desaturation or overcurrent event (2LTO_EN = '0'). In

such cases the device enters in “safe state” until the failure flag is released. See

Section 7.11

for indication on how the failure flags can be released.

t2LTOtime

ONtime

t2LTOtime

INAND

GON-GOFF

tDon

ONtime

t2LTOtime

tDon

ONtime

tDoff

ON-time < t2LTOtime

ON-time > t2LTOtime

t2LTOtime

tDoff

INAND

GON-GOFF

t2LTOtime

tDoff

t2LTOtime

tDoff

tDon

OFF-time > t2LTOtime

OFF-time < t2LTOtime

OFF-time > t2LTOtime

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