ADJUSTABLE VOLTAGE AND CURRENT REGULATOR
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1 ADJUSTABLE VOLTAGE AND CURRENT REGULATOR ADJUSTABLE OUTPUT CURRENT UP TO 2 A (GUARANTEED UP TO T j = 150 C) ADJUSTABLE OUTPUT VOLTAGE DOWN TO 2.85 V INPUT OVERVOLTAGE PROTECTION (UP TO 60 V, 10 ms) SHORT CIRCUIT PROTECTION OUTPUT TRANSISTOR S.O.A. PROTECTION THERMAL OVERLOAD PROTECTION LOW BIAS CURRENT ON REGULATION PIN LOW STANDBY CURRENT DRAIN Pentawatt TO-3 (4 lead) DESCRIPTION The is a monolithic integrated circuit for voltage and current programmable regulation. It is available in Pentawatt package or 4-lead TO-3 metal case.current limiting, power limiting, thermal shutdown and input overvoltage protection (up to 60 V) make the virtually blow-out proof. The can be used to replace fixed voltage regulators when high output voltage precision is required and eliminates the need to stock a range of fixed voltage regulators. ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V i DC Input Voltage 40 V V i Peak Input Voltage (10 ms) 60 V V i-o Dropout Voltage 32 V I o Output Current internally limited P tot Power Dissipation internally limited Tstg Storage Temperature -55 to 150 C Top Operating Junction Temperature for C -25 to 150 C for -55 to 150 C THERMAL DATA TO-3 Pentawatt R th j-case Thermal Resistance Junction-case Max 4 C/W 3 C/W R th j-amb Thermal Resistance Junction-ambient Max 35 C/W 50 C/W January /12
2 CONNECTION DIAGRAMS AND ORDER CODES (top views) Type Pentawatt TO-3 T C CH CV CT BLOCK DIAGRAM APPLICATION CIRCUITS Figure 1. Programmable Voltage Regulator with Current Limiting Figure 2. Programmable Current Regulator. 2/12
3 SCHEMATIC DIAGRAM ELECTRICAL CHARACTERISTICS (Tamb =25 C, unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit VOLTAGE REGULATION LOOP I d Quiescent drain Current (pin 3) V i = 20 V ma en Output Noise Voltage Vo = Vref Io = 10 ma B = 1 MHz 80 µv V o Output Voltage Range I o = 10 ma V V o V o Voltage Load Regulation (note 1) I o =2A I o = 1.5 A % % V i Line Regulation V 0 =5V V o Vi= 8 to 18 V db SVR Supply Voltage Rejection V 0 =5V I o = 500 ma V i =10V pp f = 100 Hz (note 2) db V i-o Droupout Voltage between Pins 1 and 5 I o = 1.5 A V 0 2% V V ref Reference Voltage (pin 4) V i =20V I o = 10 ma V 3/12
4 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Conditions Min. Typ. Max. Unit V ref Average Temperature Coefficient of Reference Voltage V i = 20 V Io = 10mA for Tj = - 25 to 125 C for Tj = 125 to 150 C mv/ C mv/ C I 4 Bias Current and Pin µa I 4 T I4 Average Temperature Coefficient (pin 4) -0.5 %/ C Z o Output Impedance V i =10V V o =V ref I o = 0.5 A f = 100 Hz 1.5 mω CURRENT REGULATION LOOP V SC Current Limit Sense Voltage between Pins 5 and 2 V i =10V V o =V ref I 5 = 100 ma V V SC T V SC Average Temperature 0.03 %/ C Coefficient of V SC I o Current Load Regulation Vi = 10 V Vo = 3V I o I o = 0.5 A I o =1A I o = 1.5 A % % % I SC Peak Short Circuit Current V i -V 0 =14V (pins 2 and 5 short circuited) 3.6 A Note 1: A load step of 2 A can be applied provited that input-output differential voltage is lower than 20 V (see Figure 3). Note 2: The same performance can be maintained at higher output levels if a bypassing capacitor is provited between pins 2 and 4. Figure 3. Typical Safe Operating Area Protection. Figure 4. Quiescent Current vs. Supply Voltage. 4/12
5 Figure 5. Quiescent Current vs. Junction Voltage. Figure 6. Quiescent Current vs. Output Current. Figure 7. Output Noise Voltage vs. Output Voltage. Figure 8. Output Noise Voltage vs. Frequency. Figure 9. Reference Voltage vs. Junction Temperature. Figure 10. Voltage Load Regulation vs. Junction Temperature. 5/12
6 Figure 11. Supply Voltage Rejection vs. Frequency. Figure 12. Dropout Voltage vs. Junction Temperature. Figure 13. Output Impedance vs. Frequency. Figure 14. Output Impedance vs. Output Current. Figure 15. Voltage Transient Reponse. Figure 16. Load Transient Reponse. 6/12
7 Figure 17. Load Transient Reponse Figure 18. Current Limit Sense Voltage vs. JunctionTemperature. APPLICATIONS CIRCUITS Figure Programmable Voltage Regulator Figure P.C.Board and Components Layout of Figure 19. Figure High Current Voltage Regulator with Short Circuit Protection. Figure Digitally Selected Regulator with Inhibit. 7/12
8 Figure 23. Programmable Voltage and Current Regulator. Note: Connecting point A to a negative voltage (for example - 3V/10 ma) it is possible to extend the output voltage range down to 0 V and obtain the current limiting down to this level (output short-circuit condition). Figure 24. High Current Regulator with NPN PassTransistor. Figure 25. High Current Tracking Regualtor. 8/12
9 Figure 26. High Input and Output Voltage. Figure 27. Constant Current Battery Charger. The resistors R 1 and R 2 determine the final charging voltage and R SC the initial charging current. D 1 prevents discharge of the battery throught the regulator. The resistor RL limits the reverse currents through ther regulator (which should be 100 ma max) when the battery is accidentally reverse connected. If R L is in series with a bulb of 12 V/50 ma rating this will indicate incorrect connection. Figure W Motor Speed Control. Figure 29. Loww Turn on. Figure 30. Light Controller. 9/12
10 DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A C D D E E F F G G H H L L L L L L L L L M M V4 40 (typ.) OUTLINE AND MECHANICAL DATA Pentawatt V L V L1 L8 V1 V R V3 R E M1 V V A B C L5 D1 L2 L3 D R V4 M H2 V4 E F E1 H3 H1 G G1 Dia. L7 L6 F1 F H2 RESIN BETWEEN LEADS L9 V4 10/12
11 DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. OUTLINE AND MECHANICAL DATA A B (*) C D E G N O 50 (typ.) 30 (typ.) P R U V (*) Measured with Gauge TO3 4-Leads 11/12
12 Information furnished is believed to be accurate and reliable.however, STMicroelectronics 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 STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in lifesupport devices or systems withoutexpress written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2000 STMicroelectronics Printed in Italy All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. 12/12
ADJUSTABLE VOLTAGE AND CURRENT REGULATOR
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