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TLE6280GP 데이터시트(PDF) 5 Page - Infineon Technologies AG

부품명 TLE6280GP
상세설명  3-Phase Bridge Driver IC
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제조업체  INFINEON [Infineon Technologies AG]
홈페이지  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

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Datasheet TLE6280GP
5
2007-07-19
The Input Low-side pins ILx (see Fig. 3) trigger the charge pump. As soon as the first exter-
nal low-side Mosfet is switched on and the corresponding bootstrap capacitor is connected
to GND, the CCP is pushed to high and provides about 13V at the CH pin. CCP can now di-
rectly feed the low-side output stages and recharge the bootstrap capacitors connected to
GND.
As soon as the first of the 3 external low-side Mosfets is switched off, the CCP will be pulled
down to be re-charged.
This synchronous operation with the output stages has the benefit that the electromagnetic
emissions generated by the charge pump can be filtered by the same filter necessary to filter
the EME of the converter itself. At the same time it is assured that the high voltage at the CH
pin is available just in time to charge the high-side bootstrap.
Fig. 3: Trigger timing of charge pump caused by changing input signals
Vreg1 13V
+13 ... +8V
CH
CL
BH
1
BH
2
BH
3
BL
1
BL
2
BL
3
Vreg2=6V
Vreg3 =
Vreg1-8V
Triggered
by ILx
VS
C
CP
C
BH1
C
BL1
Phase A
Phase B
Phase C
= Pin
Bold line = external component
C
VS
from battery
R
VS
Fig. 2: Supply structure with external components (compare to Fig. 1)
IL1
IL2
Timing of charge pump - Examples
1
2
1. ILx high
1. ILx low
IL3
CH
Charge of bootstrap
capacitors
Charge of charge pump
capacitor
IL2
1. ILx high
1. ILx low
CH
Charge of bootstrap capacitors
IL1
IL3
Charge of charge pump capacitor


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