8V REF

SPEED

CONTROLLER

PWM SINE

CONTROLLER

PWM

GENERATOR

OUTPUT

DRIVE & SHOOT

THROUGH

PROTECTION

CURRENT

LIMIT

UNDER VOLTAGE

LOCKOUT

GND

L C

L B

L A

H C

H B

160k

Ω

100k

Ω

100k

Ω

200k

Ω

5V/12V

SELECT

H A

F/

R

FREQ.

AMPLITUDE

ML4423

A

DRIVE

C

B

DRIVE

PWR

INT100

1

2

3

4

5

7

8

12,13,14

11

15

+12V

+12V

+12V

170–400V

100

Ω

100

Ω

1

µF

+

330pF

250m

Ω

166k

Ω

1k

Ω

0.15

µF

0.30

µF

1k

Ω

0.15

µF

1k

Ω

99k

Ω

99k

Ω

49.5k

Ω

500

Ω

220pF

0.47

µF

12V

A

C

B

1

2

3

24

21

22

19

23

20

9

25

15

COAST

14

3PH/2PH

18

11

28

27

17

4

6

5

7

8

26

12

10

13

16

HV POWER STAGE

0.001

µF

0.001

µF

0.1

µF

0.1

µF

0.1

µF

Note: Use Extreme caution with high voltage AC motor control and drive circuitry.

When the motor is spinning at the desired speed, and the speed is rapidly reduced,

and destruction of the power transistors, high side driver, ML4423

controller and the power supply may occur.

10

Ω

10

Ω