FS210 datasheet(10/13 Pages) FEELING

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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

ground signal. RC is an external pull-up resistance for the use of measuring FG signal. In view of

the design, the value of RC could be decided by the transistor saturation voltage (VON), sink

current (IC), and off-level voltage (VC).

The formula is:

RC=

V −

For example:

VC = +5V for TTL level.

IC = 10mA at 0.2V saturation voltage

The safety value of RC= 470Ω

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

B wire

R wire

Internal circuit of 2-phase DC motor

+Vcc

VCC

GND

+Vc

Y wire

Output

Fig 5. Application Circuit

Rev0.4 May.21, 2004 (LF)

P10/FS210

FS210 Datasheet(PDF) 10 Page - Feeling Technology Corp.