AM9468

Document number: DS38663 Rev. 1 - 2

2 of 16

www.diodes.com

May 2016

© Diodes Incorporated

AM9468

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

Typical Applications Circuit for PWM Speed Control

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

Typical Applications Circuit for VCONT/RMI Control

Notes:

1µF typically. The value of capacitor can be optimized depending on the operating mode, motor voltage and the motor current. For PWM speed control

mode, with datasheet current capability, the recommended capacitor value is 1µF. The value of the C1 should be checked in the motor design and route

in its operating conditions if it is reduced or increased from the recommended value of 1µF.

5. Diode D1 is for the reverse connection protection. In addition to power stabilization and noise immunity, C1 also absorbs regenerative motor spikes.

Depending on the amount of regenerative voltage spike, value of C1 needs to be adjusted. The zener diode Dz is used to clamp the regenerative

voltage spike from the motor operation to safe level when reverse blocking diode D1 is used. If reverse blocking diodes is not used, the use of zener

clamp Dz depends on the supply voltage capability to effectively sink the regenerative energy and voltage spike. The value of C1 and the requirement

Dz needs to be verified on each application design.