SWITCH-MODE POWER SUPPLY CONTROLLER PULSE OUTPUT DC OUTPUT GROUND EXTERNAL FUNCTION SIMULATION ZERO CROSSING INPUT CONTROL EXTERNAL FUNCTION

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1 SWITCH-MODE POWER SUPPLY CONTROLLER. LOW START-UP CURRENT. DIRECT CONTROL OF SWITCHING TRAN- SISTOR. COLLECTOR CURRENT PROPORTIONAL TO BASE-CURRENT INPUT REERSE-GOING LINEAR OERLOAD CHARACTERISTIC CURE SIP (Plastic Package) ORDER CODE : TDA60 DESCRIPTION The TDA60 is a monolithic integrated circuit desi-gned to regulate and control the switching transistor in a switching power supply. Because of its wide operational range and high vol-tage stability even at high load changes, this IC can be used not only in T receivers and video recorders but also in power supplies in Hi-Fi sets and active speakers. DIP + (Plastic Package) ORDER CODE : TDA60B PIN CONNECTIONS SIP DIP IN PULSE OUTPUT DC OUTPUT EXTERNAL FUNCTION IC SIMULATION INPUT CONTROL ZERO CROSSING REF REF ZERO CROSSING INPUT CONTROL I C SIMULATION EXTERNAL FUNCTION DC OUTPUT PULSE OUTPUT IN EPS EPS September 3 /8

2 BLOCK DIAGRAM 7 8 START-UP CIRCUIT CONTROL AMPLIFIER STANDBY OPERATION TRIGGER START HOLD BASE CURRENT AMPLIFIER COUPLING -C- CHARGING CIRCUIT OLTAGE CONTROL OERLOAD IDENTIFICATION CONTROL LOGIC BASE CURRENT SWITCH-OFF REFERENCE OLTAGE ZERO PASSAGE IDENTIFICATION COLLECTOR CURRENT SIMULATION EXTERNAL BLOCKING FUNCTION to EPS ABSOLUTE MAXIMUM RATINGS Symbol Parameter alue Unit Supply oltage 0 Reference Output 6 Identification Input 0.6, Controlled Amplifier 3, 5 8 7, 8 I, I3 3,3 ma I 5 ma I 5 5 ma I 7.5 A I8.5 A Toper Operating Ambient Temperature 0, 85 C T stg Storage Temperature 0, 50 C T j Junction Temperature 0, 5 C THERMAL DATA Symbol Parameter alue Unit R th (j c) Thermal Resistance Junction-pins Max. 5 C/W R th (j a) Thermal Resistance Junction ambient Max. 70 C/W 60-0.TBL 60-0.TBL ELECTRICAL CHARACTERISTICS (Tamb =5 o C) Symbol Parameter Test Conditions Min. Typ. Max. Unit Operating Supply oltage Range START CONDITION (according to test circuit of fig. ) I Supply Current ( not yet switched on) = 0.5 ma = ma =0. 3. ma Switch Threshold () TBL /8

3 ELECTRICAL CHARACTERISTICS (Tamb =5 o C ) (continued) Symbol Parameter Test Conditions Min. Typ. Max. Unit NORMAL OPERATION ( = 0, cont = 0, clock = ± 0.5, f = 0kHz, duty cycle : after switch on) I Supply Current cont = 0 cont =0 ref oltage Reference at Pin I < 0.mA I = 5mA 3 Control oltage cont = Collector Current Simulation oltage cont = 0, see note.8..5 Collector Current Simulation oltage cont = 0 to 0, see note External Protection Threshold Pin 7 Output oltage cont = 0, see note Pin 8 output oltage cont = 0, see note Pin 8 Output oltage Change cont = 0 to 0, see note.6. Feedback oltage see note 0. T K Reference oltage Temperature Coefficient 0 3 / o K PROTECTION OPERATION ( = 0 ; cont = 0 ; clock = ± 0.5 ; f = 0kHz ; duty cycle : ) I Supply Current ma 7 Switch off oltage Switch-off oltage Blocking oltage cont =0 0. Supply oltage for 8 Blocked cont = Supply oltage for off While Further Decreasing ELECTRICAL CHARACTERISTICS (according to test circuit of fig. ) ton Secondary oltage Switching Time ms oltage ariation with Load S 3 Closed, P 3 = 0 W S Closed, P = 5 W 0.5 Stand by Condition S Open P load =3W 0 30 f Stand by Frequency khz PP Primary Power Consumption in Stand by Condition 0 A Note : Only DC component ma ma 60-0.TBL Figure : Test Circuit Test Diagram : Overload Operation t Ω.kΩ pf kω 0kΩ µf REF I cont 0nF 00kΩ 0kΩ 00kΩ D8 N003 7Ω 0µF 0µF 60-0.EPS R = -0 R =0 t t EPS 3/8

4 Figure : Test and Application Circuit 0AC.7nF.7nF B50/ C Ω C50 TDA60 N007 MAINS SEPARATION 0µF (3) 00µF kΩ 00Ω.kΩ µf / 35 0 kω pf kω 00 kω 0nF () 0kΩ () N007 7Ω 0.68Ω 00µF / 5 00µF / 6.7µH 0kΩ /3W BY nF BY Ω BU508 nf 70pF BY pF BY pF BY pF BY AZ 6-IC 70µF 8 70µF 70µF 70µF kΩ 56kΩ 00Ω S S S 0Ω 70 Ω S 33Ω.5kΩ 6.8k Ω 56kΩ S3 S EPS () C limits the max. collector current of BU508 at overshooting the permissible output power. () Adjustement of secondary voltage. (3) Must be discharged before IC change. /8

5 CIRCUIT DESCRIPTION The TDA 60 regulates, controls, and protects the switching transistor in reverse converter power supplies at starting, normal, and overload operation. Starting Behaviour During the start-up, three consecutive operation states are passed.. An internal reference voltage is built up which supplies the voltage regulator and enables the supply to the coupling electrolytic capacitor and the switching transistor. Up to a supply voltage of, the current I is less than 3.mA.. Release of the internal reference voltage =. This voltage is abruptly available when and enables all parts of the IC to be supplied from the control logic with a thermally stable and overload protected current supply. 3. Release of control logic. As soon as the reference voltage is available, the control logic is switched on through an additional stabilization circuit. Thus, the IC is ready for operation. This start-up sequence is necessary to guarantee the supply through the coupling electrolytic capacitor to the switching transistor. Correct switching of the transistor is only guaranteed in this way. Normal Operation Zero crossing of the feedback coil is registered at pin and passed to the control logic. At pin 3 (regulation of input, overload, and standby recognition) the rectified amplitude variations of the feedback coil are applied. The regulating amplifier works with an input voltage of about and a current of about. ma. Together with the collector current simulation pin, the overload recognition defines the operating region of the regulating amplifier depending on the internal reference voltage. The simulation of the collector current is generated by an external RC network at pin and internally set threshold voltages. By increasing the capacitance (0nF) the max. collector current of the switching transistor rises, thus setting the required operating range. The extent of the regulation lies between a clamped DC voltage and an AC voltage rising in a sawtooth waveform, which may vary up to a maximum amplitude of (ref. voltage). A reduction of the secondary load down to 0 watts causes the switching frequency to rise to about 50kHz at an almost constant pulse duty factor (period to on-time approx. 3). A further reduction of the secondary load down to about watt results in changing the switching frequency to approx. 70kHz, and additionally the pulse duty factor rises to approx.. At the same time the collector peak current falls below A. In the trigger the output level of the regulating amplifier, the overload recognition, and the collector current simulation are compared and instructions are given to the control logic. There is an additional triggering and blocking possibility by means of pin 5. The output at pin 8 is blocked at a voltage of less than. at pin 5. Depending on the start-up circuit, the zero crossing identification, and the release with the aid of the trigger, the control logic flip flops are set which control the base current amplifier and the base current shut-down. The base current amplifier moves the sawtooth voltage to pin 8. A current feed-back having an external resistance of R = 0.68Ω is inserted between pin 8 and pin 7. The resistance value determines the maximum amplitude of the base driving current for the switching transistor. Protective Measures The base current shut-down, released by the control logic, clamps the output of pin 7 at.6 and thus blocks driving of the switching transistor. This protective measure will be released if the voltage at pin reaches a value typ. 7. or if voltages of typ.. occur at pin 5. In the case of a short circuit of the secondary windings of the P.S.U., the IC continuouslymonitors the fault condition. With the load completely removed from the secondary winding of the P.S.U., the IC is set to a low pulse duty factor. The total power consumption of the P.S.U. is held below 6 to 0 watts in both operating conditions. After having blocked the output, causedat a supply voltage typ. 7., a further voltage reduction with = 0.6 results in switching off the reference voltage (). 5/8

6 Figure 3 : f (khz) 80 Frequency versus Output Power (Test Circuit of Figure ) Figure : η (%) 00 Efficiency versus Output Power (Test Circuit of Figure ) Figure 5 : 60 O () Load Characteristics -f (Iq) (Test Circuit of Figure ) P O (W) EPS 0 P O (W) Figure 6 : Output oltage (mains change) (Test Circuit of Figure ) O () EPS 0 mains = mains mains = 0 = Figure 7 : Example of a PC Heatsink (35 C/W) I O (ma) 60-0.EPS 8 mains () EPS COPPER AREA 35µ THICKNESS l 60-.EPS 6/8

7 PACKAGE MECHANICAL DATA PINS - PLASTIC SIP D L3 c C L N M d a L L A b e3 B b3 e c PM-SIP.EPS Dimensions Millimeters Inches Min. Typ. Max. Min. Typ. Max. A a B b b C c c D d e e L L L L M N 0.03 SIP.TBL 7/8

8 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC POWERDIP a L b Z b e3 B e Z E D 8 0 F I PMDIP8W.EPS Dimensions Millimeters Inches Min. Typ. Max. Min. Typ. Max. a B b b D E e e F i L Z DIP8PW.TBL 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 licence is granted by implication or otherwise under anypatent 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. SGS-THOMSON Microelectronics - All Rights Reserved Purchase of I C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips I C Patent. Rights to use these components in a I C system, is granted provided that the system conforms to the I C Standard Specifications as defined by Philips. SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 8/8

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