STDRIVE102BH datasheet(26/56 Pages) STMICROELECTRONICS

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The direct mode implies that the turn-on of one driver occurs always before that the tcc,off of the complementary

one is completed: the deadtime tDT on the control signals must be chosen to be smaller than the tcc,off hence tDT

< 1120 ns. On the other hand, the user must select a proper deadtime, according to the total gate charge and the

driving current configured in the driver. The deadtime tDT must be chosen ensuring that the VGS of the MOSFET

that is turning off is equal to 0 V, before turning on the complementary MOSFET in the half-bridge. The criteria

used should follow what has already been explained in Section 5.2.1.1, thus considering the total gate charge

QG,tot and the IGATE,off selected.

Equation 4

tDT> QG,tot

IGATE,off

(4)

Figure 15. Current management using direct mode INH/INL

-Ihold,off

-Iclamp

tcc,off

tcc,on

INHx

INLx

VGS,LSx

VGS,HSx

+Ihold,on

+IGATE,on

-IGATE,off

hold

off

gate

hold

gate

off

clamp

hold

off

-Ihold,off

-Iclamp

+Ihold,on

+IGATE,on

-IGATE,off

tcc,off

tcc,on

gate

hold

off

clamp

gate

off

Current

capability

Current

capability

hold

tdt

5.2.1.3

TCC and IGATE configuration example

Figure 16 shows an example of how to configure TCC and IGATE considering that each driver drives a target

MOSFET with a total gate charge QG,tot = 120 nC at 12 V of VGS. Using Igate,on = 350 mA and Igate,off = 700 mA

allows to complete the charge of the gate in less than 350 ns and a discharge in less than half of the time.

Therefore, selecting a tcc,off = 420 ns and tcc,on = 840 ns provides enough margin for a safe operation of the

power stage.

Using EN/IN mode allows the device to manage the deadtime that is 420 ns, equal to the tcc,off. According to

Table 9, Table 10, and Table 11 it is possible to select the resistors to be connected to the TCC and IGATE pins,

as shown in Figure 16.

STDRIVE102BH, STDRIVE102H

Device description

DS14545 - Rev 1

page 26/56

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