L6385E Ver la hoja de datos (PDF) - STMicroelectronics

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L6385E

High-voltage high and low side driver

STMicroelectronics 

Bootstrap driver

L6385E

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

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

Vdrop = -3--5-0--µ--n--s-C--- ⋅ 125Ω ∼ 0.8V

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 4. Bootstrap driver

DBOOT

VS

HVG

LVG

VBOOT

H.V.

VOUT

VS

CBOOT

TO LOAD

HVG

LVG

VBOOT

H.V.

VOUT

CBOOT

TO LOAD

a

b

D99IN1056

8/16

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