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TLE6280GP 데이터시트(PDF) 5 Page - Infineon Technologies AG |
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TLE6280GP 데이터시트(HTML) 5 Page - Infineon Technologies AG |
5 / 25 page 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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