TS317

TS317 3-Terminal Adjustable Output Positive Voltage Regulator TO-263 Pin assignment: 1. Adjustable 2. Output 3. Input (Heatsink surface connected to pin 2) Output Voltage Range From 1.25V to 37V Output Current up to 1.5A General Description The TS317 is adjustable 3-terminal positive voltage regulator capable of supplying in excess of 1.5A 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. The TS317 is offered in 3-pin TO-220, TO-263, TO-252 and SOT-223 package. Features Output current up to 1.5A * TO-220/TO-263 for 1.5A * TO-252/SOT-223 for 500mA Output Adjustable between 1.25 V and 37 V Internal Thermal Overload Protection Internal Short-Circuit Current Limiting Constant with Temperature Output Transistor Safe-Area Compensation Floating Operation for High Voltage Applications Eliminates Stocking Many Fixed Voltages Output voltage offered in 4% tolerance Standard Application Vout = 1.25 V * (1 + R2 / R1 ) + Iadjj * R2 Since IAdj is controlled to less than 100 µA, the error associated with this term is negligible in most applications A common ground is required between the input and the output voltages. The input voltage must remain typically 2.0V above the output voltage even during the low point on the Input ripple voltage. * = 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. Ordering Information Part No. TS317CZ TS317CM TS317CP TS317CW -20 ~ +150 C o Operating Temp. Package TO-220 TO-263 TO-252 SOT-223 TS317 1-8 2003/12 rev. D Absolute Maximum Rating Input Voltage Power Dissipation Operating Junction Temperature Range Storage Temperature Range Vin Pd TJ TSTG 40 Internal Limited -20 ~ +150 -65 ~ +150 V W o o C C Electrical Characteristics (VI -VO = 5.0 V, Io=500mA for TO-220/TO-263 packages, Io=200mA for TO-252/SOT-223 package; Tj =TLOW to THIGH see [Note 1]; Pmax per [Note 2]; unless otherwise specified.) CHARACTERISTIC Reference voltage (Note 4) Pd ≤ Pmax, 10mA ≤ Io ≤ Imax, 3.0 V ≤ Vi - Vo ≤ 40 V Line regulation (Note 3) o Ta = 25 C, 3.0 V ≤ Vi -Vo ≤ 40 V FIGURE 3 1 2 SYMBOL Vref REGline REGload M IN. 1.20 ----- TYP. 1.25 0.01 5.0 0.1 0.03 50 0.2 MAX. 1.30 0.07 25 0.5 0.07 100 5.0 UNIT V %/V Load regulation (Note 3) o Ta = 25 C, 10mA ≤ IO ≤ Imax, VO ≤ 5.0 mV %V %Vo/W uA uA VO ≥ 5.0 Thermal regulation o Ta = 25 C, 20 ms Pulse Adjustment pin current Adjustment pin current change, Pd ≤ Pmax, 10mA ≤ Io ≤ Imax, 2.5V ≤ VI - VO ≤ 40V Maximum output current Pd ≤ Pmax, (Vin-Vout) ≤15V CZ, CM Package CP, CW Package Temperature stability (TLOW ≤ Tj ≤ THIGH) Minimum load current to maintain regulation (VI - VO = 40 V) RMS Noise, % of VO, Ta =25 oC, 10HZ ≤ f ≤ 10KHZ Long-term stability (Note 5), Tj = THIGH o Ta =25 C for endpoint measurements ,1000hrs 3 1.2 Iadj ∆Iadj --- Imax 3 3 -3 TS Imin N S 1.5 0.5 ----1 3.5 0.003 0.3 -10 -1.0 A % mA % % Notes: o o 1. TLOW = -20 C, THIGH = + 150 C 2. Pmax: CZ package=20W, CM package=3W, CP package=1.5W, CW package=0.8W, 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. Selected devices with tightened tolerance reference voltage available. 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. Cadj, when used, is connected between the adjustment pin and ground. TS317 2-8 2003/12 rev. D Block Diagram Test Circuit Figure 1. line regulation and ∆Iadj/line test circuit TS317 3-8 2003/12 rev. D Test Circuit Figure 2. load regulation and ∆Iadj/line test circuit Figure 3. standard test circuit Figure 4. ripple rejection test circuit TS317 4-8 2003/12 rev. D Application Information Basic Circuit Operation The TS317 is a 3-terminal floating regulator. In operation, the TS317 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 TS317 was designed to control Iadj to less than 100uA 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 TS317 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. 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 120 HZ in a 10V application. Although the TS317 is stable with no output capacitance, like any feedback circuit, certain values of external capacitance can cause excessive ringing. An output increased. A 10uµF capacitor should improve ripple capacitance (Co) in the form of a 1uF tantalum or 25uF aluminum electrolytic capacitor on the output swamps this effect and insures stability. 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 TS317 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. 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. Figure 5. basic circuit configuration Load Regulation The TS317 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. Figure 6. voltage regulator w ith protection diode TS317 5-8 2003/12 rev. D Application Information Figure 7. “LABORATORY” pow er supply w ith adjustable current limit and output voltage Figure 8. adjustable current limiter Figure 9. 5V electronic shutdow n regulator Figure10. slow turn-on regulator Figure 11. current regulator TS317 6-8 2003/12 rev. D TO-220 Mechanical Drawing A B C K L DIM P J I M D H F G E O N A B C D E F G H I J K L M N O P TO-220 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 10.000 10.500 0.394 0.413 3.240 4.440 0.128 0.175 2.440 2.940 0.096 0.116 6.350 0.250 0.381 1.106 0.015 0.040 2.345 2.715 0.092 0.058 4.690 5.430 0.092 0.107 12.700 14.732 0.500 0.581 8.382 9.017 0.330 0.355 14.224 16.510 0.560 0.650 3.556 0.508 27.700 2.032 0.255 5.842 4.826 1.397 29.620 2.921 0.610 6.858 0.140 0.020 1.060 0.080 0.010 0.230 0.190 0.055 1.230 0.115 0.024 0.270 TO-263 Mechanical Drawing A E F DIM A B C D E F G H I J B I H C D G TO-263 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 10.000 10.500 0.394 0.413 14.605 15.875 0.575 0.625 0.508 0.991 0.020 0.039 2.420 2.660 0.095 0.105 4.064 4.830 0.160 0.190 1.118 1.400 0.045 0.055 0.450 0.730 0.018 0.029 8.280 8.800 0.325 0.346 1.140 1.400 0.044 0.055 1.480 1.520 0.058 0.060 TS317 7-8 2003/12 rev. D TO-252 Mechanical Drawing J A E F DIM A B C D E F G I B TO-252 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 6.570 6.840 0.259 0.269 9.250 10.400 0.364 0.409 0.550 0.700 0.022 0.028 2.560 2.670 0.101 0.105 2.300 2.390 0.090 0.094 0.490 0.570 0.019 0.022 1.460 1.580 0.057 0.062 0.520 5.340 1.460 0.570 5.550 1.640 0.020 0.210 0.057 0.022 0.219 0.065 G D C H H I J SOT-223 Mechanical Drawing A B I DIM A B SOT-223 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 6.350 6.850 0.250 0.270 2.900 3.100 0.114 0.122 3.450 0.595 4.550 2.250 0.835 6.700 0.250 10° 1.550 3.750 0.635 4.650 2.350 1.035 7.300 0.355 16° 1.800 0.136 0.023 0.179 0.088 0.032 0.263 0.010 10° 0.061 0.148 0.025 0.183 0.093 0.041 0.287 0.014 16° 0.071 H C J K F G E D C D E F G H I J K TS317 8-8 2003/12 rev. D