NCV33035 データシートの表示（PDF） - ON Semiconductor

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NCV33035

Brushless DC Motor Controller

ON Semiconductor 

MC33035, NCV33035

14

VCC = 12 V

VBoost VM = 170 V

2

1.0 k

5

Rotor

1

6

Position

Decoder

1 2 1.0 M

4

21

4.7 k

24

1N4744

20

MOC8204

Optocoupler

Load

19

21

20

19

Figure 25. High Voltage Interface with

N−Channel Power MOSFETs

40 k

9

R

Q4

100 mV 15

C

RS

23

Brake Input

The addition of the RC filter will eliminate current−limit instability caused by the

leading edge spike on the current waveform. Resistor RS should be a low in-

ductance type.

Figure 26. Current Waveform Spike Suppression

21

Rg

D

20

Rg

D

19

Rg

D

40 k

9

100 mV 15

23

D = 1N5819

Brake Input

Series gate resistor Rg will dampen any high frequency oscillations caused

by the MOSFET input capacitance and any series wiring induction in the

gate−source circuit. Diode D is required if the negative current into the Bot-

tom Drive Outputs exceeds 50 mA.

Figure 27. MOSFET Drive Precautions

C

21

C

20

C

19

40 k

9

100 mV 15

23

Brake Input

IB

+

0

t

−

Base Charge

Removal

The totem−pole output can furnish negative base current for enhanced tran-

sistor turn−off, with the addition of capacitor C.

Figure 28. Bipolar Transistor Drive

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