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 1/10 TDA7274 APPLICATION CIRCUIT VS = 3.0V RM = 4.9Ω RT = 220Ω Eg = 1.65V IM = 100mA VM = RM IM + Eg = 2.14V SCHEMATIC DIAGRAM 2/10 TDA7274 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VS Supply Voltage 6 V IM Motor Current 700 mA Ptot Power Dissipation at Tamb = 25°C 1.25 W Value Unit 100 °C/W THERMAL DATA Symbol Rth j-amb Parameter Thermal Resistance Junction-ambient Max. ELECTRICAL CHARACTERISTICS (Refer to test circuit, VS = 3V, Tamb = 25°C unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit 6 V 0.20 0.22 V 6.0 mA 1.8 VS Supply Voltage Range Vref Reference Voltage Iq Quiescent Current 2.4 Id (Pin 6) Quiescent Current 120 K Vsat ∆Vref Vref ⁄ ∆VS ∆K ⁄ ∆VS K ∆Vref Vref ⁄ ∆IM ∆K ⁄ ∆IM K ∆Vref Vref IM = 100mA 0.18 50 55 – IM = 100mA 0.13 0.3 V Line Regulation IM = 100mA VS = 1.8 to 6V 0.20 %/V Voltage Characteristic of Shut Ratio IM = 100mA VS = 1.8 to 6V 0.80 %/V Load Regulation IM = 20 to 200mA 0.004 %/mA Current Characteristic of Shut Ratio IM = 20 to 200mA –0.03 %/mA IM = 100mA Tamb = –20 to +60°C 0.04 %/°C IM = 100mA Tamb = 20 to +60°C 0.02 %/°C Shunt Ratio IM = 100mA Residual Voltage ⁄ ∆T amb Temperature Characteristic of Reference Voltage ∆K ⁄ ∆Tamb Temperature Characteristic of K Shut Ratio 45 µA 3/10 TDA7274 Figure 1 : Test Circuit. Figure 2 : Quiescent Current vs. Supply Voltage. 4/10 Figure 3 : Reference Voltage vs. Supply Voltage. TDA7274 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. 5/10 TDA7274 Figure 10 : Reference Voltage vs. Ambient Temperature. Figure 11 : Application Circuit. VS = 3.0V RM = 4.9Ω RT = 220Ω 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. 6/10 Figure 14 : Speed Variations vs. Motor Current. TDA7274 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 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. 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. 7/10 TDA7274 Figure 17 : 3V Stereo Cassette Miniplayer with Motor Speed Control. 8/10 TDA7274 MINIDIP PACKAGE MECHANICAL DATA mm DIM. MIN. A TYP. inch MAX. MIN. 3.32 TYP. MAX. 0.131 a1 0.51 0.020 B 1.15 1.65 0.045 0.065 b 0.356 0.55 0.014 0.022 b1 0.204 0.304 0.008 0.012 D E 10.92 7.95 9.75 0.430 0.313 0.384 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 6.6 0.260 I 5.08 0.200 L 3.18 3.81 0.125 0.150 9/10 TDA7274 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. 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. 10/10