Data Sheet

11

May. 2011 Rev. 2. 4

BCD Semiconductor Manufacturing Limited

SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER

AM4961

Typical Application

Figure 11. Typical Application of AM4961 (Note 6)

Note 6:

*1. Ground Line Layout

PGND is connected to motor supply stage and GND is

connected to control stage. All ground lines from control

stage are connected to GND.

*2. Stability of Power Supply

than 1

μF.

*3. Hall Input

To avoid noise, the shortest line is recommended to con-

nect with Hall stage which has about 20mV hysteresis.

Thus, the ideal Hall input is 50mV or over.

*4. COSC Capacitor

*5. FG Output

FG output terminal is open collector output which varies

with phase change.

*6. RD Output

RD output terminal is open collector output. It is low at

rotation mode and high when stopped.

*7. HB Pin

This pin is available to output a 1.25V Hall bias voltage.

*8. VMIN Pin

If this pin is disused, connect it directly with VPWM, the

minimum duty cycle will be 10%.

OUT2

OUT1

VCC

GND

VMIN

CT

VPWM

VREF

COSC

HIN-

FG

HB

RD

HIN+

Hall

AM4961

D1

C1

1

μF or greater

R1

27k

R2

10k

R4

39k

R6 330k

R7

100k

R5

100k

PWM

VCC

L1

R3 7.5k

R8

68k

C2

0.33

μF

C3

100pF

C4

0.47

μF

1 (1)

2 (3)

3 (4)

4 (5)

5 (6)

6 (7)

7 (8)

8 (9)

9 (10)

10 (11)

11 (12)

12 (13)

13 (14)

14 (15)

PGND

(16)