TLE6280GP_07 Datasheet, PDF (20/25 Pages) Infineon Technologies AG – 3-Phase Bridge Driver IC

Datasheet TLE6280GP
Typ. Boostrap voltage vs. Duty Cycle
Conditions:
Parameter:
Mosfet: 6x SPB80N04S2-04; f_PWM=20kHz, Vs=9V
Charge pump capacitor C_CP / Bootstrap capacitor C_BX
14
12
10
8
1.5µF / 220nF
3µF / 440nF
6
4.5µF / 660nF
4
2
0
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle [%]
Fig. 13: Typ. bootstrap voltage V(BHx)-V(SHx);
duty cycle of 1 half-bridge = 50%; duty cycle of the other
2 halfbridges variable
14
12
10
8
6
4
2
0
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle [%]
1.5µF / 220nF
3µF / 440nF
4.5µF / 660nF
Fig. 14: Typ. bootstrap voltage V(BHx)-V(SHx);
duty cycle of 1 half-bridge = 0%; duty cycle of the other 2
halfbridges variable
Remark:
The reachable duty cycle depends on the used PWM patterns. To achieve an even higher duty cycle, run it for
some periods and reduce the duty cycle only for 1 period down to 90% to recharge the bootstrap capacitors.
20
2007-07-19