L6384E 데이터 시트보기 (PDF) - STMicroelectronics

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L6384E

High-voltage half bridge driver

STMicroelectronics 

L6384E

Bootstrap driver

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

a

VBOOT

H.V.

VOUT

VS

CBOOT

TO LOAD

HVG

LVG

b

VBOOT

H.V.

VOUT

CBOOT

TO LOAD

D99IN1067

9/17

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