L6393D datasheet(15/20 Pages) STMICROELECTRONICS

Part #	L6393D

Description	Half-bridge gate driver

PDF	20 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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15 / 20 page

L6393

Bootstrap driver

15/20

where Qgate is the gate charge of the external power MOS, RDSon is the on resistance of the

bootstrap DMOS, and Tcharge is the charging time of the bootstrap capacitor.

For example: using a power MOS with a total gate charge of 30 nC the drop on the

bootstrap DMOS is about 1 V, if the Tcharge is 5 µs. In fact:

Vdrop has to be taken into account when the voltage drop on CBOOT is calculated: if this drop

is too high, or the circuit topology doesn’t allow a sufficient charging time, an external diode

can be used.

Figure 6.

Bootstrap driver

drop

30nC

µs

--------------- 120

Ω 0.7V

∼

⋅

TO LOAD

D99IN1067

H.V.

HVG

LVG

HVG

LVG

CBOOT

TO LOAD

H.V.

CBOOT

DBOOT

BOOT

VOUT

BOOT

VOUT

L6393D Datasheet(PDF) 15 Page - STMicroelectronics