Technology

FS210

APPLICATION NOTE

The Example of Typical Application Circuit

Fig 5 is the example of typical application circuit. The red, yellow, and black wires are the input

points of the motor system: red, the input of power supply; yellow, the output of FG; black, the

The formula is:

C

ON

C

I

V

For example:

D1 is the reverse protection diode. As if the red and black wires reversely connect with the power

source, the current will flow through the ground via IC and coils L1 and L2 to power supply.

Under such kind of circumstances, the IC and coils are easy to be burned out. Therefore, D1,

the reverse protection diode, is necessary for the design. However, D1 will also cause an extra

voltage drop on the supply voltage.

C1 is a capacitor to reduce the ripple noise caused during the transient of the output stages.

The volume of the ripple noise depends on the coil impedance and characteristics.

FS210

L1

D1

C1

B wire

R wire

NO

SO

Internal circuit of 2-phase DC motor

+Vcc

VCC

GND

+Vc

Y wire

Rc

FG

Output

L2

Fig 5. Application Circuit

Rev0.4 May.21, 2004 (LF)