AM9468

Document number: DS38663 Rev. 1 - 2

10 of 16

www.diodes.com

May 2016

© Diodes Incorporated

AM9468

Speed Control

This device allows both DC voltage input and PWM signal input for speed control. Typically only one of the method is used to control the motor

speed. In DC voltage speed control mode, the voltage on the VCONT pin is compared with the CPWM triangular wave to generate internal PWM

signal to drive the output. In PWM speed control mode, the PWM signal on the PWM pin directly controls the output PWM drive.

The typical application circuits shows the two speed control methods.

1.

Speed Control by PWM Pin

REGH

5VREG

VCONT

RMI

FG

RD

HIN+

HB

HIN-

CPWM

PWM

GND

3

4

5

6

7

8

14

13

12

11

10

9

RF

OUT2

1

2

16

15

OUT1

Dz

D1

CPWM

Hall

PWM signal for

speed control

C1

SYSTEM

POWER

AM9468

R1

Motor Coil

2.

Speed Control by VCONT/RMI Pin

REGH

5VREG

VCONT

RMI

FG

RD

HIN+

HB

HIN-

CPWM

PWM

GND

3

4

5

6

7

8

14

13

12

11

10

9

RF

OUT2

1

2

16

15

OUT1

Dz

D1

CPWM

C1

SYSTEM

POWER

VPWM

Hall

AM9468

R1

Motor Coil