These values depend on PWM control algorithm
R E(H)
15 V
One-Leg Diagram of
R BS
D BS
Motion SPM ? 2 Product
P
0.1
μ F
Vcc
VB
47
μ F
IN HO
COM VS
Inverter
470
μ F
1
μ F
Vcc
IN
OUT
Output
COM
N
Figure 13. Recommended Bootstrap Operation Circuit and Parameters
3rd Notes:
4. It would be recommended that the bootstrap diode, D BS , has soft and fast recovery characteristics.
5. The bootstrap resistor(R BS ) should be three times greater than R E(H) . The recommended value of R E(H) is 5.6 ? , but it can be increased up to 20 ? for a slower dv/
dt of high-side.
6. The ceramic capacitor placed between V CC - COM should be over 1 ? F and mounted as close to the pins of the Motion SPM ? 2 product as possible.
?2006 Fairchild Semiconductor Corporation
FSAM75SM60A Rev. C4
12
www.fairchildsemi.com
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