AM2849

Motor Driver ICs

AMtek semiconductors

Nov. 2020 V0.9

- 6 -

IN_A

IN_B

M

220

μF

0.1uF

OUT_A

IN_A

VCC

GND

IN_B

OUT_A

OUT_B

OUT_B

1

2

3

4

8

7

6

5

C1

C2

0.1

μF

C4

1.

C1、C2: Power supply VCC pin capacitor:

a.

The capacitor can reduce the power spike when the motor is in motion. To avoid the IC directly

damaged by the VCC peak voltage. It also can stabilize the power supply voltage and reduce its

ripples.

b.

The C1 capacitor can compensate power when motor starts running.

c.

The capacitor value (uF) determines the stability of the VCC during motor in motion. If the large

voltage power or a heavy loading motor is used, then a larger capacitor would be needed.

d.

On the PCB configuration, the C1、C2 must be mounted as close as possible to VCC pin .

2.

C4: The across-motor capacitor

a.

The C4 capacitors can reduce the power spike when motor is running. 0.1μF capacitor is

recommended.

b.

The C4 capacitor must be added to the general application.

3.

It’s not allowed INA, INB input remain floating status, because there is a minor leakage current between

P-N junction when temperature rising, the leakage current will go through internal pull- low resistor

which causes INA or INB floating level abnormal pull high and output abnormal working.