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TDA7274
LOW-VOLTAGE DC MOTOR SPEED CONTROLLER
WIDE OPERATING VOLTAGE RANGE (1.8 to 6 V) BUILT-IN LOW-VOLTAGE REFERENCE (0.2 V) LINEARITY IN SPEED ADJUSTMENT HIGH STABILITY VS. TEMPERATURE LOW NUMBER OF EXTERNAL PARTS
MINIDIP
DESCRIPTION The TDA7274 is a monolithic integrated circuit DC motor speed controller intended for use in microcassettes, radio cassette players and other consumer equipment. It is particulary suitable for low-voltage applications.
ORDERING NUMBER : TDA7274
PIN CONNECTION (top view)
November 1988
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APPLICATION CIRCUIT
VS = 3.0V RM = 4.9 RT = 220 Eg = 1.65V IM = 100mA VM = RM IM + Eg = 2.14V
SCHEMATIC DIAGRAM
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ABSOLUTE MAXIMUM RATINGS
Symbol VS IM Ptot Supply Voltage Motor Current Power Dissipation at Tamb = 25C Parameter Value 6 700 1.25 Unit V mA W
THERMAL DATA
Symbol Rth j-amb Parameter Thermal Resistance Junction-ambient Max. Value 100 Unit C/W
ELECTRICAL CHARACTERISTICS (Refer to test circuit, VS = 3V, Tamb = 25C unless otherwise specified)
Symbol VS Vref Iq Id (Pin 6) K Parameter Supply Voltage Range Reference Voltage Quiescent Current Quiescent Current Shunt Ratio Residual Voltage Line Regulation Voltage Characteristic of Shut Ratio Load Regulation Current Characteristic of Shut Ratio IM = 100mA IM = 100mA IM = 100mA VS = 1.8 to 6V IM = 100mA VS = 1.8 to 6V IM = 20 to 200mA IM = 20 to 200mA IM = 100mA Tamb = -20 to +60C IM = 100mA Tamb = 20 to +60C 45 IM = 100mA Test Condition Min. 1.8 0.18 0.20 2.4 120 50 0.13 0.20 0.80 0.004 -0.03 0.04 0.02 55 0.3 Typ. Max. 6 0.22 6.0 Unit V V mA A - V %/V %/V %/mA %/mA %/C %/C
Vref
Vref
Vsat VS
K VS K Vref
Vref
IM
K IM K Vref
Vref
K Tamb Temperature Characteristic of K Shut Ratio
T amb Temperature Characteristic of Reference Voltage
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Figure 1 : Test Circuit.
Figure 2 : Quiescent Current vs. Supply Voltage.
Figure 3 : Reference Voltage vs. Supply Voltage.
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Figure 4 : Shunt Ratio vs. Supply Voltage. Figure 5 : Reference Voltage vs. Load Current.
Figure 6 : Shunt Ratio vs. Load Current.
Figure 7 : Minimum Supply Voltage (typical) vs. Load Current.
Figure 8 : SaturationVoltage vs. Load Current.
Figure 9 : Quiescent Current vs. Ambient Temperature.
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Figure 10 : Reference Voltage vs. Ambient Temperature. Figure 11 : Application Circuit.
VS = 3.0V RM = 4.9 RT = 220
Eg = 1.65V IM = 100mA VM = RM IM + Eg = 2.14V
Figure 12 : P. C. Board and Components layout of the Circuit of fig. 11 (1 : 1 scale).
Figure 13 : Speed Variations vs. Supply Voltage.
Figure 14 : Speed Variations vs. Motor Current.
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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
RT - RM + Vref Eg = RT Id + IM K RB RT 1 1 + R + R (1 + K ) S S 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 F typ.) and C2 (1 F typ.) depend on the type of motor used. C1 adjusts WOW and flutter of the system. C2 suppresses motor spikes.
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Figure 17 : 3V Stereo Cassette Miniplayer with Motor Speed Control.
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MINIDIP PACKAGE MECHANICAL DATA
DIM. MIN. A a1 B b b1 D E e e3 e4 F I L 3.18 7.95 2.54 7.62 7.62 6.6 5.08 3.81 0.125 0.51 1.15 0.356 0.204 1.65 0.55 0.304 10.92 9.75 0.313 0.100 0.300 0.300 0.260 0.200 0.150 mm TYP. 3.32 0.020 0.045 0.014 0.008 0.065 0.022 0.012 0.430 0.384 MAX. MIN. inch TYP. 0.131 MAX.
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Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.
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