TDA7285 Просмотр технического описания (PDF) - STMicroelectronics

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TDA7285

STEREO CASSETTE PLAYER AND MOTOR SPEED CONTROLLER

STMicroelectronics 

TDA7285

APPLICATION INFORMATION

Figure 21.

Eg

=

RT

Id

+

IM

(

RT

K

−

RM

)

+

Vref

RS

has

to

be[a1d+jusRRteSb d+ sRRoTSth(a1t

+

1

K

)

]

the applied

voltage

VM is suitable for a given motor, the speed is then

linearly adjustable varing RB.

The value RT is calculated so that

RT (max.) > K(min.) * RM (min.)

if RT (max.) > K * RM, instability may occur.

The values of C15 (4.7µF typ.) and C14 (1µF

typ.) depend on the type of motor used. C15 ad-

justs WOW and flutter of the system. C14 sup-

presses motor spikes.

8/11

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