TS317L 3-Terminal Adjustable Positive Voltage Regulator SOP-8 Pin Definition: 1. Input 2. Output 3. Output 4. Adjustable 8. N/C 7. Output 6. Output 5. N/C General Description The TS317L is adjustable 3-terminal positive voltage regulator capable of supplying in excess of 100mA over an output voltage range of 1.25 V to 37 V. This voltage regulator is exceptionally easy to use and require only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow-out proof. Besides replacing fixed regulators, the TS317L is useful in a wide variety of other applications. Since the regulator is “floating “ and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input-to-output differential is not exceeded. Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the TS317L can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.25V where most loads draw little current. Features Standard Application Circuit ● ● Output Voltage Range 1.25 to 37V Output current in Excess of 100mA ● Eliminates Stocking Many Fixed Voltages ● ● Internal Thermal Overload Protection Current Limit Constant with Temperature ● Output transistor safe-area compensation ● Output voltage offered in 4% tolerance ● Floating Operation for High Voltage Applications Ordering Information Part No. Package Packing TS317LCS RLG SOP-8 2.5kpcs / 13” Reel Cin is required if regulator is located an appreciable distance from power supply filter. Co is not needed for stability, however, it does improve transient response. Note: “G” denotes for Halogen Free Vout = 1.25 V(1 + R2 / R1 ) + IAdjR2 Since IAdj is controlled to less than 100µA, the error associated with this term is negligible in most applications Absolute Maximum Ratings (Ta = 25°C unless otherwise noted) Parameter Symbol Limit Unit Input Voltage VIN 40 V Power Dissipation PD Internal Limited W Operating Junction Temperature TJ -20~+125 °C Storage Temperature Range TSTG -65~+150 °C Thermal Resistance - Junction to Ambient RӨJA 165 °C/W Document Number: DS_P0000264 1 Version: D15 TS317L 3-Terminal Adjustable Positive Voltage Regulator Electrical Characteristics (VI -VO = 5.0 V, Io=40mA; TJ =TLOW to THIGH see [Note 1]; PMAX per [Note 2]; unless otherwise specified.) Parameter Fig Symbol Min. Typ. Max. Unit 3 VREF 1.20 1.25 1.30 V 1 REGLINE -- 0.01 0.07 %/V 2 REGLOAD --- 5.0 0.1 25 0.5 mV %V REGTHERMAL -- 0.03 0.07 %Vo/W 3 IADJ -- 50 100 µA 1.2 ∆IADJ -- 0.2 5.0 µA Maximum output current 3 IMAX 100 -- 200 20 --- mA Temperature stability (TLOW ≤ TJ ≤ THIGH) 3 TS -- 1 -- % Vo Minimum load current to maintain regulation (VI - VO = 40 V) 3 ILMIN -- 3.5 10 mA N -- 0.003 -- % Vo Reference voltage, 3V ≤ VI-VO ≤ 40V 10mA ≤ Io ≤ Imax, PD ≤ PMAX, Line regulation (Note 3) o TA = 25 C, 3V≤ VI-VO ≤40V Load regulation TA = 25oC, 10mA ≤ IO ≤ Imax (Note 3) o Thermal regulation, TA = 25 C (Note 6), 20mS Pulse Adjustment pin current Adjustment pin current change, 3V ≤ VI - VO ≤ 40V 10mA ≤ IO ≤ IMAX, PD ≤ PMAX, o RMS Noise, % of VO, TA =25 C, 10Hz ≤ f ≤ 10KHz Ripple Rejection, Vo =10V, f =120Hz (Note 4) Without CADJ 4 PSRR -65 -dB CADJ = 10µF 66 80 -Long-term stability (Note 5), TJ= THIGH 3 S -0.3 1.0 % o TA =25 C for endpoint measurements,1000hrs Notes: 1. TLOW to THIGH = -20°C to +125°C 2. PMAX, is internally limited 3. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 4. CADJ, when used, is connected between the adjustment pin and ground. 5. Since Long-Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot. 6. Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation in the effect of these temperature gradients on the output voltage and is expressed in the percentage of output change per watt of power change in a specified time. Document Number: DS_P0000264 2 Version: D15 TS317L 3-Terminal Adjustable Positive Voltage Regulator Functional Block Diagram Test Circuit Figure 1. Line Regulation Test Circuit Figure 2. Load Regulation and ∆Iadj/Load Test Circuit Figure 3. Standard Test Circuit Document Number: DS_P0000264 Figure 4. Ripple Rejection Test Circuit 3 Version: D15 TS317L 3-Terminal Adjustable Positive Voltage Regulator Electrical Characteristics Curve Figure 5. Load Regulation Figure 6. Current Limit Figure 7. Adjustment Pin Current Figure 8. Dropout Voltage Figure 9. Temperature Stability Figure 10. Minimum Operating Current Document Number: DS_P0000264 4 Version: D15 TS317L 3-Terminal Adjustable Positive Voltage Regulator Electrical Characteristics Curve Figure 11. Ripple Rejection Figure 12. Ripple Rejection vs. Frequency Figure 13. Line Regulation Figure 14. Output Noise Figure 15. Line Transient Response Figure 16. Load Transient Response Document Number: DS_P0000264 5 Version: D15 TS317L 3-Terminal Adjustable Positive Voltage Regulator Application information Basic Circuit Operation The TS317L is a 3-terminal floating regulator. In operation, the TS317L develops and maintains a nominal 1.25V reference (VREF) between its output and adjustment terminals. This reference voltage is converted to a programming current (IPROG.) by R1 (see Figure 17), and this constant current flows through R2 to ground. The regulated output voltage is given by: VOUT= VREF ( 1 + R2 / R1 ) + IADJ * R2 Since the current from the adjustment terminal (IADJ) represents an error term in the equation, the TS317L was designed to control IADJ to less than 100µA and keep it constant. To do this, all quiescent operating current is returned to the output terminal. This imposes the requirement for a minimum load current. If the load current is less than this minimum, the output voltage will rise. Since the TS317L is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltages with respect to ground is possible. Figure 17. Basic Circuit Configuration Figure 18. Voltage Regulator with Protection Diode Protection Diode When external capacitors are used with any I.C. regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. Figure 18 shows the TS317L with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values (Co > 25µF, CADJ > 10µF). Diode D1 prevents Co from discharging thru the I.C. during an input short circuit. Diode D2 protects against capacitor CADJ discharging through the I.C. during an output short circuit. The combination of diodes D1 and D2 prevents CADJ from discharging through the I.C. during an input short circuit. Load Regulation The TS317L is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. For best performance, the programming resistor (R1) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby degrading regulation. The ground end of R2 can be returned near the load ground to provide remote ground sensing and improve load regulation. External Capacitor A 0.1µF disc or 1µF tantalum input bypass capacitor (CIN) is recommended to reduce the sensitivity to input line impedance. The adjustment terminal may be bypassed to ground to improve ripple rejection. This capacitor (CADJ) prevents ripple from being amplified as the output voltage is rejection about 15dB at 120HZ in a 10V application. Although the TS317L is stable with no output capacitance, like any feedback circuit, certain values of external capacitance can cause excessive ringing. An output increased. A 10µF capacitor should improve ripple capacitance (Co) in the form of a 1µF tantalum or 25µF aluminum electrolytic capacitor on the output swamps this effect and insures stability. Document Number: DS_P0000264 6 Version: D15 TS317L 3-Terminal Adjustable Positive Voltage Regulator Application information (Continue) Figure 19. “LABORATORY” power supply with adjustable current limit and output voltage Figure 21. 5V Electronic Shutdown Regulator Figure 20. Adjustable Current Limiter Document Number: DS_P0000264 7 Version: D15 TS317L 3-Terminal Adjustable Positive Voltage Regulator Application information (Continue) Figure 22. Slow Turn-on Regulator Document Number: DS_P0000264 Figure 23. Current Regulator 8 Version: D15 TS317L 3-Terminal Adjustable Positive Voltage Regulator SOP-8 Mechanical Drawing Unit: Millimeters Marking Diagram Y = Year Code M = Month Code for Halogen Free Product O =Jan P =Feb Q =Mar R =Apr V =Aug S =May T =Jun U =Jul W =Sep X =Oct Y =Nov Z =Dec L = Lot Code Document Number: DS_P0000264 9 Version: D15 TS317L 3-Terminal Adjustable Positive Voltage Regulator Notice Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale. Document Number: DS_P0000264 10 Version: D15