AM4964

Document number: DS37241 Rev. 2 - 2

13 of 21

www.diodes.com

June 2014

© Diodes Incorporated

AM4964

A Product Line of

Diodes Incorporated

Applications Note

Typical application circuit for PWM input signal for speed control with AM4964 is shown below. The speed is primarily controlled by a voltage on

the CF pin (either from DC voltage signal or PWM inputs signal converted to DC voltage).

OUT2

OUT1

VCC

CT

VMIN

RADJ

PWM

IN-

CF

FG

IN+

RT

TH

Hall

D1

C1

1

F

R2

VCC

L1

C3

1

F

0.47F

3

R3

R4

V+

R5

R6

V+

4

5

6

7

8

9

11

13

14

15

17

18

R1

RT

C2

R9

SGND

16

HB

R7

D2

PGND

NC

NC

TA

1

2

10

R8

TL

12

19

D3

20

note7

Typical Application Circuit (External PWM Input Speed Control)

Note 7: C1 is for power stabilization and should be 1

μF or higher depending on the motor current and motor design.