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TDA7274D
LOW-VOLTAGE DC MOTOR SPEED CONTROLLER
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TDA7274September 2004
1FEATURES WIDE OPERATING VOLTAGE RANGE (1.8 to
6 V) BUILT-IN LOW-VOLTAGE REFERENCE
(0.2V) LINEARITY IN SPEED ADJUSTMENT HIGH STABILITY VS. TEMPERATURE LOW NUMBER OF EXTERNAL PARTS
2DESCRIPTIONThe TDA7274 is a monolithic integrated circuit DC
motor speed controller intended for use in micro-
cassettes, radio cassette players and other con-
sumer equipment. It is particulary suitable for low-
voltage applications.
LOW-VOLTAGE DC MOTOR SPEED CONTROLLER
Figure 2. Application CircuitRev. 4
TDA7274
Figure 3.
Table 2. Absolute Maximum Ratings
Table 3. Thermal Data
Figure 4. Schematic Diagram
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TDA7274
Table 4. Electrical Characteristcs (Refer to test circuit, VS = 3V, Tamb = 25°C unless otherwise
specified)
Figure 5. Test Circuit
TDA7274
Figure 6. Quiescent Current vs. Supply
Voltage.
Figure 7. Reference Voltage vs. Supply
Voltage.
Figure 8. Shunt Ratio vs. Supply Voltage.
Figure 9. Reference Voltage vs. Load Current.
Figure 10. Shunt Ratio vs. Load Current.
Figure 11. Minimum Supply Voltage (typical)
vs. Load Current.
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TDA7274
Figure 12. Saturation Voltage vs. Load Current.
Figure 13. Quiescent Current vs. Ambient
Temperature.
Figure 14. Reference Voltage vs. Ambient
Temperature.
Figure 15. Application Circuit
Figure 16. P. C. Board and Components layout
of the Circuit of fig. 15.
Figure 17. Speed Variations vs. Supply
Voltage.
TDA7274
Figure 18. Speed Variations vs. Motor Current. Figure 19. Speed Variations vs. Ambient
Temperature. APPLICATION INFORMATION
Figure 20. 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 mF typ.) depend on the type of motor used. C1 adjusts WOW and
flutter of the system. C2 suppresses motor spikes.g RTIdIMT------- RM– VrefS-------T-------11----+++++=
