STDRIVE102BH datasheet(21/56 Pages) STMICROELECTRONICS

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5.2.1

Driving current management

The gate driver turns on the respective MOSFET by sourcing the programmed current IGATE,on for a time equal to

the programmed tcc,on time. After this time, the MOSFET’s gate should be completely charged, so the driver

reduces the source current to a holding value Ihold,on.

The gate driver turns off the respective MOSFET by sinking the programmed current IGATE,off for a time equal to

the programmed tcc,off time. After this time, the MOSFET’s gate should be completely discharged, so the driver

reduces the sink current to a holding value Ihold,off.

To avoid induced turn-on effects, during the turn-on phase of a MOSFET (that is, when a driver is forcing IGATE,on)

the complementary driver sinks the maximum available current Iclamp for the entire tcc,on duration.

Note that the current capability is the maximum current that the driver is able to source/sink: when the gate of the

external MOSFET is completely charged/discharged the driver is no longer able to source/sink current.

The current levels can be summarized as below:

•

The value of the source current and the sink current is set by the analog voltage on IGATE input (see

Table 9).

•

The Ihold,on current is 25 mA typical value.

•

The Ihold,off current is 50 mA typical value.

•

The Iclamp current is 2140 mA typical value.

Table 9. Programmable gate current typical values

IGATE level

refer to Table 11

IGATE,on (source)

[mA]

IGATE,off (sink)

[mA]

0 (GND)

150

300

250

500

300

600

350

700

400

800

500

1000

550

1100

600

1200

650

1300

700

1400

800

1600

850

1700

900

1800

15 (VDD)

1000

2000

The turn-on and turn-off timings (respectively tcc,on and a tcc,off) are set by the voltage on TCC input (see

Table 10).

Moreover, the input mode and the deglitch filter time of the VDS monitoring protection (tdg(VDS)) are adjusted

according to the configuration of the TCC (see Section 5.2.3).

STDRIVE102BH, STDRIVE102H

Device description

DS14545 - Rev 1

page 21/56

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