AN4043 datasheet(32/60 Pages) STMICROELECTRONICS

No de pièce	AN4043

Description	In recent years the variable speed motor control market has required high performance

PDF	60 Pages

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

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Electrical characteristics and functions

AN4043

32/60

Doc ID 022726 Rev 2

Equation 10

where:

QGATE: total IGBT gate charge.

ILKGE: IGBT gate emitter leakage current.

IQBO: bootstrap circuit quiescent current.

ILK: bootstrap circuit leakage current.

ILKDiode: bootstrap diode leakage current.

ILKCap: bootstrap capacitor leakage current (relevant when using an electrolytic capacitor

but can be ignored if other types of capacitors are used).

tHon: high-side ON time.

QLS: charge required by the internal level shifters.

Finally, the minimum size of the bootstrap capacitor is:

Equation 11

For an easier selection of bootstrap capacitor,

Figure 21 shows the behavior of CBOOT

(calculated) versus switching frequency (fsw), with different values of ΔVCBOOT,

corresponding to

Equation 11 Equation 11 for a continuous sinusoidal modulation and a duty

cycle

δ = 50%.

Figure 21.

Bootstrap capacitor vs. switching frequency

()

Hon

LKC

LKDiode

QBO

LKG E

GA TE

TO T

⋅

CBOOT

TOT

BOOT

AM11814v1

fsw (kHz)

STGIPN3H60A

STGIPN3H60

δ = 50%

ΔV

CBOOT =0.1V

ΔV

CBOOT =0.3V

ΔV

CBOOT =0.5V

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