STDRIVE102BH datasheet(32/56 Pages) STMICROELECTRONICS

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The AFE is supplied by the VDD pin (internally connected) and it is referred to the AGND pin, to improve immunity

against ground noise.

The current consumption of the operational amplifiers slightly depends on the voltage of its output stage (VOA_Ox):

the consumption is maximum when the output is in the middle of its operating range (VDD/2), and is minimum

when the output is saturated (VOA_Ox = GND or VOA_Ox = VDD).

The overall current consumption of the AFE is part of the overall current availability of the 3.3 V internal LDO

(IDD), when using external loads connected to VDD.

5.4

Soft turn-off

When the VDS monitoring protection or the AFE comparators are triggered, it could indicate a severe overcurrent

event on the power stage (for example, short-circuit). In this case, the soft turn-off function reduces the sink

current of the gate drivers, avoiding a fast dI/dt transition on the power stage.

The drivers turn off the power MOSFET using the current IGATE,off(SO) listed in Table 14 and the tcc,off(SO) is

increased by about 8 times the normal tcc,off to ensure a correct discharge of the MOSFETs’ gates (refer to

Table 15).

Table 14. Soft-off gate currents (according to the nominal gate current IGATE level)

IGATE level

Refer to Table 11

IGATE,off

[mA]

IGATE,off(SO)

[mA]

0 (GND)

150

300

500

150

600

150

700

150

800

150

1000

300

1100

300

1200

300

1300

300

1400

300

1600

500

1700

500

1800

500

15 (VDD)

2000

500

STDRIVE102BH, STDRIVE102H

Device description

DS14545 - Rev 1

page 32/56

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