µPC1470

4

APPLICATION CIRCUIT

M

VCC

L (47 H)

Motor

RT

RS

1

2

4

3

Vref

STARTING

CIRCUIT

COMPARATOR

CURRENT

MILLOR

µ

VCC = 12 V

Rm = 19.5

Ω

RT = 330

Ω

RS = 1 k

Ω

EO = 2.3 V

K

= 20

Notes 1. The motor speed can be adjusted by the variable resistor RS.

R

E

S

O

min .

=

V• R

– V

– I • R

ref

T

ref

q

T

2. If RT max. > K•Rm min, instability of the motor may occur.