Data Sheet

SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER

AM4962

Apr. 2011

Rev. 1. 2

BCD Semiconductor Manufacturing Limited

12

390K

560K

820K

1M

2.2M

4.7M

8.2M

0

20

40

60

80

100

R1, R2, R3, R4, R6 open

0

10

20

30

40

5060708090

100

0

20

40

60

80

100

R6=100k, R1, R2, R3, R4, R5 Open

R6=270k, R1, R2, R3, R4, R5 Open

R1, R2, R3, R4, R5, R6 Open

Input PWM Duty Cycle (%)

0

10

203040

50

6070

8090

100

0

20

40

60

80

100

R5=270k, R1, R2, R3, R4, R6 Open

R5=560k, R1, R2, R3, R4, R6 Open

R1, R2, R3, R4, R5, R6 Open

Input PWM Duty Cycle (%)

Typical Application (Note 4, Continued)

Note 4 (Refer to application circuit 2 unless otherwise noted.):

Adjust slope K of output PWM's duty vs. input PWM's duty

1. The default K is about 0.8 (application circuit 1).

2. Adding R5 can increase K (see Figure 12).

3. Adding R6 can decrease K (see Figure 13).

Figure 12

Figure 13

Adjust minimum duty of output PWM:

1. The default minimum duty of output PWM is about 20% (application circuit 1, Figure 10).

2. Decreasing R2 can increase minimum output PWM duty (see Figure 14).

3. Adding R5 can decrease minimum output PWM duty (see Figure 15).

Figure 14

Figure 15

10

20

30

40

50

60

70

80

6.5k

6.0k

5.5k

5.0k

4.5k

4.0k

R1=15k,R3,R4,R5,R6 open

3.5k