TDA7274 Datasheet, PDF(7/10 Page) STMicroelectronics – LOW-VOLTAGE DC MOTOR SPEED CONTROLLER

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TDA7274 Datasheet, PDF (7/10 Pages) STMicroelectronics – LOW-VOLTAGE DC MOTOR SPEED CONTROLLER

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Figure 15 : Speed Variations vs.

Ambient Temperature.

TDA7274

APPLICATION INFORMATION

Figure 16.

IM = Motor current at rated speed

RM = Motor resistance

Eg = Back electromotive force

VM = IM .RM + Eg

ï£«ï£¬ï£RKT

RMï£¶ï£·

ï£¸

Vref

ï£®ï£¯1

ï£°

K1 )

ï£¹

ï£º

ï£»

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.) â¢. RM (min.)

If RT (max.) > K â¢ RM, instability may occur.

The values of C1 (4.7 ÂµF typ.) and C2 (1 ÂµF typ.)

depend on the type of motor used. C1 adjusts

WOW and flutter of the system. C2 suppresses

motor spikes.

7/10

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