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AN4043 Scheda tecnica(PDF) 32 Page - STMicroelectronics

Il numero della parte AN4043
Spiegazioni elettronici  In recent years the variable speed motor control market has required high performance
PDF  60 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4043 Scheda tecnica(HTML) 32 Page - STMicroelectronics

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Electrical characteristics and functions
AN4043
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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
()
LS
Hon
ap
LKC
LKDiode
LK
QBO
LKG E
GA TE
TO T
Q
t
I
I
I
I
I
Q
Q
+
⋅
+
+
+
+
+
=
CBOOT
TOT
BOOT
V
Q
C
Δ
=
AM11814v1
0
1
2
3
4
5
0
5
10
15
20
fsw (kHz)
STGIPN3H60A
STGIPN3H60
δ = 50%
ΔV
CBOOT =0.1V
ΔV
CBOOT =0.3V
ΔV
CBOOT =0.5V



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