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 3 : Ground 5 : Reference 8 : Output Other pins are not connected March 1993 Rm = 14.7 Ω Rt RS Eg Im = 290 Ω = 1 kΩ (total) = 2.65 V = 110 mA 1/6 TDA1154 PIN CONNECTION (Top view) ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VCC Supply voltage 20 V IO Output current 1.2 A (see curve) W +150 °C -55 to +150 °C Ptot Tj Tstg Power dissipation Junction temperature Storage temperature range Figure 2. Test circuit THERMAL DATA Symbol Parameter Value Unit Rth-j-amb Thermal resistance junction-ambient max 100 °C/W Rthj-amb Thermal resistance junction-pin 4 max 70 °C/W 2/6 TDA1154 ELECTRICAL CHARACTERISTICS Tamb = +25 °C (Unless otherwise specified) Symbol V(ref) ∆ V(ref) V(ref) Typ. Max. Unit 1.15 1.25 1.35 V Reference voltage temperature coefficient VCC = +6V I(8) = 0.1A Tamb = -20°C to +70°C - 0.02 - %/°C / ∆ VCC Line regulator VCC = +4V to +18V I(8) = 0.1A - 0.02 - %/V / ∆ | (8) Load regulator VCC = +6V l(8) = 25 to 400 mA - 0.009 - %/mA Minimum supply voltage | (8) = 0.1A 2.5 - - V Starting current(*) ∆ V(ref) = −50% V(ref) VCC = +5V 1.2 - - VCC = +2.5V 0.5 0.8 - VCC = +6V I(8) = 100 µA - 1.7 - VCC = +6V I(8) = 0.1A 18 20 22 /∆T V (5 - 3) I(8) IO (5) K Quiescent current on pin 5 K= ∆ | (8) ∆ | (5) reflection coefficient I(8) = 0.1A Min. VCC = +6V V(ref) V(ref) Test Conditions Reference voltage ∆ V(ref) ∆ V(ref) Parameter ∆ V(ref) = −5% V(ref) A mA ∆K / ∆ VCC K K spread versus VCC VCC = +6V to +18V I(8) = 0.1A - 0.45 - %/V ∆K / ∆ | (8) K K spread versus I(8) VCC = +6V I(8) = 25 to 400 mA - 0.005 - %/mA K spread versus temperature VCC = +6V I(8) = 0.1A Tamb = +20°C to +70°C - 0.02 - %/°C ∆K /∆ T K (*) 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) + V(ref) RS ] + V(ref) (b) Rt = K R m (K = 20) From figure 2 it is seen that: I (8) = Im + V(ref) (c) RS Subsituting equations (a) and (c) into (b) yields: K − Rm (1) Rt 1 ) + 1 ] + Rt IO (5) (d) ( 1 + K Rs + V(ref) [ (2) Figure 4. Application circuit 4/6 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 ] + E g = Im [ Rt 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 V(ref) (1 + 1 / K) ≅ Eg − V(ref) − Rt IO (5) V(ref) Eg − V(ref) − Rt IO (5) Where V(ref) = 1.2V and IO (5) = 1.7 mA TDA1154 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 Z 3.18 3.81 1.52 0.125 0.150 0.060 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. 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