TDA7274 datasheet(7/10 Pages) STMICROELECTRONICS

부품명	TDA7274

상세설명	LOW-VOLTAGE DC MOTOR SPEED CONTROLLER

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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7 / 10 page

Figure 15 : Speed Variations vs.

Ambient Temperature.

APPLICATION INFORMATION

Figure 16.

IM = Motor current at rated speed

RM = Motor resistance

Eg = Back electromotive force

VM =IM .RM +Eg

Eg

= RT Id + IM







RT

K

− RM







+ Vref







1

+

RB

RS

+

RT

RS

(1 +

1

K

)







RS has to be adjusted so that the applied voltage

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

linearly adjustable varing RB.

The value of RT is calculated so that

RT (max.) <K (min.)

•. RM (min.)

If RT (max.) >K

• RM, instability may occur.

The values of C1 (4.7

µF typ.) and C2 (1 µF typ.)

depend on the type of motor used. C1 adjusts

WOW and flutter of the system. C2 suppresses

motor spikes.

TDA7274

7/10

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TDA7274 데이터시트(PDF) 7 Page - STMicroelectronics

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