Diodes AM4961 Manuel d'utilisateur télécharger pdf (Page 11)

Data Sheet

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

C1 is employed to stabilize V

. Its capacitance is no less

than 1μF.

*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

When C

is 100pF, the COSC frequency will be 25kHz.

*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

1μF or greater

27k

10k

39k

R6 330k

100k

PWM

VCC

7.5k

R8 68k

0.33μF

100pF

0.47μF

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)

1 2 ... 6 7 8 9 10 11 12 13 14

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Diodes AM4961 Manuel d'utilisateur Page 11

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