Datasheet TLE6280GP

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)

rectly feed the low-side output stages and recharge the bootstrap capacitors connected to

GND.

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.

IL1

IL2

! Timing of charge pump - Examples

1

2

1. ILx high

1. ILx low

CH

Charge of charge pump

capacitor

IL2

1. ILx high

1. ILx low

CH

IL1

Charge of charge pump capacitor

IL3

Charge of bootstrap

capacitors

Charge of bootstrap capacitors

IL3

5

2004-03-31

Fig. 3: Trigger timing of charge pump caused by changing input signals