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| TDA1154 SPEED REGULATOR FOR DC MOTORS MATCHING FLEXIBILITY TO MOTORS WITH VARIOUS CHARACTERISTICS BUILT-IN CURRENT LIMIT ON-CHIP 1.2V REFERENCE VOLTAGE STARTING CURRENT: 0.5 A @ 2.5V REFLECTION COEFFICIENT K = 20 DESCRIPTION The TDA1154 is a monolithic integrated circuit intended for speed regulation of permanent magnet dc motors used in record players, tape recorders, cassette recorders and toys. The circuit offers an excellent speed regulation with much higher power supply, temperature and load variations than conventional circuits built around discrete components. Minidip ORDERING NUMBER : TDA1154 Figure 1. Application circuit VCC = 12 V Rm Rt RS Eg Im = 14.7 = 290 = 1 k (total) = 2.65 V = 110 mA 3 : Ground 5 : Reference 8 : Output Other pins are not connected March 1993 1/6 TDA1154 PIN CONNECTION (Top view) ABSOLUTE MAXIMUM RATINGS Symbol VCC IO Ptot Tj Tstg Supply voltage Output current Power dissipation Junction temperature Storage temperature range Parameter Value 20 1.2 (see curve) +150 -55 to +150 Unit V A W C C Figure 2. Test circuit THERMAL DATA Symbol Rth-j-amb Rthj-amb Parameter Thermal resistance junction-ambient Thermal resistance junction-pin 4 max max Value 100 70 Unit C/W C/W 2/6 TDA1154 ELECTRICAL CHARACTERISTICS Tamb = +25 C (Unless otherwise specified) Symbol V(ref) V(ref) /T Parameter Reference voltage Reference voltage temperature coefficient Line regulator Test Conditions VCC = +6V I(8) = 0.1A Min. 1.15 Typ. 1.25 0.02 Max. 1.35 Unit V %/C V(ref) V(ref) VCC = +6V I(8) = 0.1A Tamb = -20C to +70C VCC = +4V to +18V I(8) = 0.1A VCC = +6V l(8) = 25 to 400 mA | (8) = 0.1A V(ref) = -5% V(ref) V(ref) V(ref) / VCC / | (8) - 0.02 - %/V Load regulator - 0.009 - %/mA V(ref) V (5 - 3) Minimum supply voltage 2.5 - - V I(8) Starting current(*) V(ref) = -50% V(ref) VCC = +5V VCC = +2.5V 1.2 0.5 18 0.8 1.7 20 22 mA A IO (5) K Quiescent current on pin 5 K= | (8) | (5) reflection coefficient VCC = +6V VCC = +6V I(8) = 100 A I(8) = 0.1A K / VCC K K / | (8) K K / T K K spread versus VCC VCC = +6V to +18V I(8) = 0.1A VCC = +6V I(8) = 25 to 400 mA VCC = +6V I(8) = 0.1A Tamb = +20C to +70C - 0.45 - %/V K spread versus I(8) - 0.005 - %/mA K spread versus temperature - 0.02 - %/C (*) An internal protection circuit reduces the current if the temperature of the junction increase: I(8) = 0.75A at Tj = +140 C OPERATING MODE Figure 3 The circuit maintains a 1.2V costant reference voltage between pins 5 and 8: V(5 - 8) = V(ref) = 1.2V The current (I(5)) drawn by the circuit at pin 5 is sum of two currents. One is constant: IO(5) = 1.7mA and the other is proportional to pin 8 current (I(8)): I(5) = IO(5) +I(8)K(a) (IO(5) = 1.7mA, K = 20) 3/6 TDA1154 If Eg and Rm are motor back electromotive force and motor internal resistance respectively, then: Eg + R m Im = Rt [ I (5) + From figure 2 it is seen that: I (8) = Im + V(ref) (c) RS The motor speed will be independent of the resisting torque if Eg is also independentof Im. Therefore, in order to determine the value of Rt term(1) in (d) must be zero: Rt = K R m (K = 20) If Rt > KRm, an instability may occur as a result of overcompensation. The value of RS is determinated by term (2) in (d) so as to obtain he back electromotive force (Eg) corresponding to required motor speed: RS = Rt Rt V(ref) (1 + 1 / K) Eg - V(ref) - Rt IO (5) V(ref) RS ] + V(ref) (b) Subsituting equations (a) and (c) into (b) yields: E g = Im [ Rt K - Rm ]+ V(ref) Eg - V(ref) - Rt IO (5) (1) Rt 1 ) + 1 ] + Rt IO (5) (d) (1+ K Rs Where V(ref) = 1.2V and IO (5) = 1.7 mA + V(ref) [ Figure 4. Application circuit 4/6 (2) TDA1154 MINIDIP PACKAGE MECHANICAL DATA DIM. MIN. A a1 B b b1 D E e e3 e4 F I L Z 3.18 7.95 2.54 7.62 7.62 6.6 5.08 3.81 1.52 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 0.060 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. 5/6 TDA1154 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. 6/6 |
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