TS317LCTA3

TS317L 3-Terminal Adjustable Positive Voltage Regulator TO-92 Pin Definition: 1. Adjustable 2. Output 3. Input 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 adjus table 3-terminal positive voltage regulator capable of supplying in excess of 100mA over an output voltage r ange 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 adjus tment and output, the TS317L can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment ter minal to ground which programs the output to 1.25V where most loads draw little current. Features ● ● ● ● ● ● Output Voltage Range 1.25 to 37V Output current in Excess of 100mA Eliminates Stocking Many Fixed Voltages Inter nal Ther mal Overload Protec tion Current Limit Cons tant w ith Temperatur e Output trans istor safe-area compensation Standard Application Circuit ● Output voltage offered in 4% tolerance ● Floating Operation for High Voltage Applications Ordering Information Part No. TS317LCT B0 TS317LCT A3 TS317LC S R L Package TO-92 TO-92 SOP-8 Packi ng 1Kpcs / Bulk 2Kpcs / Ammo 2.5Kpcs / 13” Reel Cin is required if regulator is located an apprec iable distance from power supply filter. Co is not needed for stability, how ever, it does improv e transient response. Vout = 1.25 V(1 + R2 / R1 ) + IAdjR2 Since IAdj is controlled to less than 100 µ A, the error associated with this ter m is negligible in most applications 1/11 Version: B07 TS317L 3-Terminal Adjustable Positive Voltage Regulator Absolute Maximum Rating (Ta = 25oC unless otherwise noted) Parameter Input Voltage Power Dissipation Operating Junction Temperature Storage Temperature Range Symbol VIN PD TJ TSTG Limit 40 Inter nal Limited - 2 0 ~+1 2 5 - 6 5 ~+1 5 0 Unit V W o o C C Electrical Characteristics (VI -VO = 5.0 V, Io=40mA; TJ =TLOW to THIGH see [N ote 1]; Pmax per [Note 2]; unless otherwise specified.) Parameter 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 = 25 C , 10mA ≤ IO ≤ Imax (Note 3) o o Figure 3 1 2 Symbol Vref REGline REGload Min. 1.20 ------ Typ. 1.25 0.01 5.0 0.1 0.03 50 Max. 1.30 0.07 25 0.5 0.07 100 Unit V %/V mV %V %Vo/W uA Thermal regulation, Ta = 25 C (Note 6) , 20mS Pulse REGther m Adjus tment pin current 3 Iadj Adjus tment pin current change, 3V ≤ VI - VO ≤ 40V -0.2 5.0 uA 10mA ≤ Io ≤ Imax , Pd ≤ Pmax, 1.2 ΔIadj Maximum output current VI - VO ≤ 6.25V, Pd ≤ Pmax (TO-92 package) 3 Imax 100 200 -mA o VI - VO ≤ 40V, Pd ≤ Pmax , Ta = 25 C ( TO-92 -20 -pac k age) Temperatur e stability (TLOW ≤ Tj ≤ THIGH) 3 TS -1 -% Vo Minimum load current to maintain regulation 3 ILmin -3.5 10 mA (VI - VO = 40 V) o RMS Noise, % of VO, Ta =25 C, 10Hz ≤ f ≤ 10KHz N -0.003 -% Vo Ripple Rejec tion, Vo =10V, f =120Hz (Note 4) Without Cadj 4 PSRR -65 -dB C adj = 10 uF 66 80 -Long-ter m s tability (Note 5), Tj = THIGH 3 S -0.3 1.0 % o Ta =25 C for endpoint measurements ,1000hrs Notes: o o 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. C hanges in VO due to heating effec ts mus t be taken into account separately . Pulse testing w ith low duty cycle is used. 4. C adj, when used, is connected between the adjustment pin and ground. 5. Since Long-Ter m Stability cannot be measured on each device before shipment, this specification is an engineering es timate of average stability from lot to lot. 6. Pow er dissipation w ithin an IC voltage regulator produces a temperature gradient on the die, affec ting individual IC components on the die. These effects can be minimized by pr oper integrated circuit design and layout tec hniques . Ther mal 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. 2/11 Version: B07 TS317L 3-Terminal Adjustable Positive Voltage Regulator Functional Block Diagram Test Circuit Figure 1. Li ne Regul ati on Test Cir cuit Figur e 2. Load Regulation and ∆Iadj/Load Test Circuit Figure 3. Standar d Test Cir cuit Figure 4. Rippl e Rejecti on Test Cir cuit 3/11 Version: B07 TS317L 3-Terminal Adjustable Positive Voltage Regulator Electrical Characteristics Curve Fi gure 5. Load Regul ati on Fi gure 6. Current Limit Fi gure 7. Adj ustment Pi n Current Fi gure 8. Dr opout Voltage Fi gure 9. Temper ature Stability Fi gure 10. Mi ni mum Oper ating Current 4/11 Version: B07 TS317L 3-Terminal Adjustable Positive Voltage Regulator Electrical Characteristics Curve Fi gure 11. Ri pple Rejection Fi gure 12. Ri pple Rejection vs. Fr equency Fi gure 13. Li ne Regulati on Fi gure 14. Output Noise Fi gure 15. Li ne Transient Response Fi gure 16. Load Tr ansient Response 5/11 Version: B07 TS317L 3-Terminal Adjustable Positive Voltage Regulator Application information Basic Circuit Operation The TS317L is a 3-te rminal floating regula tor. In opera tion, the TS317L develops and maintains a nominal 1.25V refe rence (Vref) between its output and adjustment te rminals. This referenc e voltage is converted to a p rogramm ing current (Iprog.) by R1 (see Figure 17), and this constant current flows through R2 to grou nd. The regulated outpu t voltage is given by: Vout = Vre f ( 1 + R2 / R1 ) + Iadj * R2 Since the current from the adjustment term inal (Iadj) represents an error term in the equation , the TS317L was designed to control Iadj to less than 100uA and keep it constant. To do this, all quiescent operating current is retu rned to the ou tput term inal. This imposes the require ment for a minimum load current. If the lo ad current is less than this m inimum , the ou tput voltage will rise. Since the TS317L is a floating regulator, it is only the voltage differential across the circuit which is impo rtant to performance, and operation at h igh voltages with respect to ground is possible. Figure 17. Basic Circuit C onf iguration Protection Diode Figure 18. Voltage R egulat or wit h Protection D iode When external capacitors are used with any I.C. regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharging th rough low current poin ts into th e regulator. Figure 18 shows the TS317L with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values (Co > 25uF, Cadj > 10uF). Diode D1 prevents Co from discharging thru the I.C. du ring an input short circuit. D iode D2 protects against capacito r CADJ discharging through the I.C . during an output short circuit. The combination o f diodes D1 and D2 prevents CADJ from d ischarging through the I.C. du ring an input short c ircuit. Load Regulation The TS317L is capable of providing extremely good load regula tion, but a few precautions are needed to obtain maximum performance. For best performance, the program ming resistor (R1 ) should be connected as close to the regulator as po ssible to minimize line drops wh ich effectively appear in series with the refe rence, thereby degrading regulation. The ground end of R2 can be returned near the load ground to p rovide remo te ground s ensing and improve load regula tion. External Capacitor A 0.1µF d isc or 1 µF tantalum input bypass capacitor (C in) is recommended to reduce the sensitivity to input line impedance. The adjustment te rminal may be bypassed to ground to imp rove ripple re jection. This capacitor (Cadj) prevents ripple fro m being amplified as the output voltage is rejection about 15dB at 120 HZ in a 10V application. Although the TS317L is s table w ith no output capacitance, like any feedback circuit, certain values of exte rnal capacita nce can cause excessive ringing. An outpu t increased. A 10uµF ca pacitor should imp rove ripple capacitance (Co) in the fo rm of a 1uF tantalum o r 25uF aluminum electrolytic capacito r on the outp ut swamps this e ffect and insures stability. 6/11 Version: B07 TS317L 3-Terminal Adjustable Positive Voltage Regulator Application information (Continue) Figure 19. “ LABORA TOR Y” power supply with adjustable current limit and output voltage Figure 20. A djustable Current Limiter Figure 21. 5V Electronic Shutdown Regulator 7/11 Version: B07 TS317L 3-Terminal Adjustable Positive Voltage Regulator Application information (Continue) Figure 22. Slow Turn-on Regulator Figure 23. C urrent R egulat or 8/11 Version: B07 TS317L 3-Terminal Adjustable Positive Voltage Regulator TO-92 Mechanical Drawing TO-92 DIME NSION DIM A B C D E F G H MILLIMETERS MIN 4.30 4.30 0.43 2.19 3.30 2.42 0.37 MA X 4.70 4.70 0.49 2.81 3.70 2.66 0.43 INCHES MIN 0.169 0.169 0.017 0.086 0.130 0.095 0.015 MA X 0.185 0.185 0.019 0.111 0.146 0.105 0.017 14.30(typ) 0.563(typ) Marking Diagram Y M = Year Code = Month C ode (A=Jan, B =Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oc t, K=Nov , L=Dec) = Lo t C ode L 9/11 Version: B07 TS317L 3-Terminal Adjustable Positive Voltage Regulator SOP-8 Mechanical Drawing DIM A B C D F G K M P R SOP-8 DIMEN SION MILLIMETER S INCH ES MIN MAX MIN MAX. 4.80 5.00 0.189 0.196 3.80 4.00 0.150 0.157 1.35 1.75 0.054 0.068 0.35 0.49 0.014 0.019 0.40 1.25 0.016 0.049 1.27BSC 0.05BSC 0.10 0.25 0.004 0.009 0º 7º 0º 7º 5.80 6.20 0.229 0.244 0.25 0.50 0.010 0.019 Marking Diagram Y M = Year Code = Month C ode (A=Jan, B =Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oc t, K=Nov , L=Dec) = Lo t C ode L 10/11 Version: B07 TS317L 3-Terminal Adjustable Positive Voltage Regulator Notice Specifications of the produc ts displayed herein are s ubject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Infor mation contained herein is intended to pr ovide a product description only. N o license, express or implied, to any intellectual proper ty 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 par ticular purpose, merchantability, or infringement of any patent, copyright, or other intellectual proper ty right. The products shown herein are not designed for use in medical, life-saving, or life-sus taining applications . C ustomers 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. 11/11 Version: B07