L6386AD データシートの表示（PDF） - STMicroelectronics

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L6386AD

High-voltage high and low side driver

STMicroelectronics 

L6386AD

Bootstrap driver

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 =

3----0----n---C---

5µs

⋅

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

a

VBOOT

H.V.

VOUT

VS

CBOOT

TO LOAD

HVG

LVG

b

VBOOT

H.V.

VOUT

CBOOT

TO LOAD

D99IN1056

9/17

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