+5 V
100 ?
R PF = 4.7 ?
SPM
IN (UH) , IN (VH) , IN (WH)
MCU
100 ?
100 ?
IN (UL) , IN (VL) , IN (WL)
V FO
1 nF
C PF = 1 nF
1 nF
1 nF
COM
Figure 11. Recommended MCU I/O Interface Circuit
3rd Notes:
1. RC coupling at each input might change depending on the PWM control scheme in the application and the wiring impedance of the application’s printed circuit board. The input
signal section of the Motion SPM ? 3 product integrates a 5 k ?? ( typ.) pull-down resistor. Therefore, when using an external filtering resistor, please pay attention to the signal
voltage drop at input terminal.
2. The logic input works with standard CMOS or LSTTL outputs.
These values depend on PWM control algorithm.
One-Leg Diagram of
Motion SPM 3 Product
P
15 V
22 μ F
0.1 μ F
Vcc VB
IN HO
COM VS
Inverter
Vcc
Output
1000 μ F
1 μ F
IN
OUT
COM V SL
N
Figure 12. Recommended Bootstrap Operation Circuit and Parameters
3rd Notes:
3. The ceramic capacitor placed between V CC - COM should be over 1 ? F and mounted as close to the pins of the Motion SPM 3 product as possible.
?2007 Fairchild Semiconductor Corporation
FSBF10CH60BT Rev. C3
12
www.fairchildsemi.com
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