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TDA7274 Datasheet(PDF) 7 Page - STMicroelectronics

Part # TDA7274
Description  LOW-VOLTAGE DC MOTOR SPEED CONTROLLER
PDF  10 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7274 Datasheet(HTML) 7 Page - STMicroelectronics

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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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