PJ317CW

PJ317 3-Terminal Adjustable Output Positive Voltage Regulator T • • • • he PJ317 is adjustable 3-terminal positive voltage regulator capable of supplying in excess of 1.5 A 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. over an output voltage range of 1.25 V to 37 V. This voltage regulator is exceptionally easy to use and require only two FEATURES Output Current in Excess of 1.5 Ampere Output Adjustable between 1.25 V and 37 V Internal Thermal Overload Protection Internal Short-Circuit Current Limiting TO-220 TO-220 / TO-263 / TO92/ TO-252 / SOT-223 Pin 1. Adjust 2. Vout 3. Vin Heatsink surface connected to Pin2 TO-263 Constant with Temperature • • • • Output Transistor Safe-Area Compensation Floating Operation for High Voltage Applications Standard 3-lead Transistor Packages Eliminates Stocking Many Fixed Voltages TO-92 TO-252 SOT-223 ORDERING INFORMATION Device Operating Temperature Package Design Load Current 1.5A 1.5A 0.1A 0.5A 1A 0.3A SOP-8 Pin 1. Vin 2. Vout 3. Vout 4. Adjust 5. Nc 6. Vout 7. Vout 8. Nc PJ317CZ PJ317CM PJ317CT PJ317CP PJ317CW PJ317CS -20℃ to 85℃ TO-220 TO-263 TO-92 TO-252 SOT-223 SOP-8 CIRCUIT SCHEMATIC STANDARD APPLICATION * = 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. Vout = 1.25 V (1 + R2 / R1 ) + IAdj R2 Since IAdj is controlled to less than 100 µA, the error associated with this term is negligible in most applications 1-11 2002/10.rev.A PJ317 3-Terminal Adjustable Output Positive Voltage Regulator MAXIMUM RATINGS RATING Input-Output Voltage Differential Power Dissipation Operating Junction Temperature Range Storage Temperature Range SYMBOL VI - V O PD TJ Tstg VALUE 40 Internally Limited -20 to + 85 -65 to +150 UNIT Vdc ℃ ℃ PJ317 ELECTRICAL CHARACTERISTICS (VI -VO = 5.0 V; IO = 0.5A for TO-220 packages; TJ =Tlow to Thigh [see Note 1]; Imax and Pmax per Note 2; unless otherwise specified.) CHARACTERISTIC Line Regulation (Note 3) TA = 25º C, 3.0 V ≤ VI -VO ≤ 40 V Load Regulation (Note 3) TA = 25℃, 10 mA ≤ IO ≤ Imax , VO ≤ 5.0 VO ≥ 5.0 Thermal Regulation (TA = 25℃) 20 ms Pulse Adjustment Pin Current Adjustment Pin Current Change , PD ≤ Pmax 10mA ≤ IL ≤ Imax, 2.5V ≤ VI - VO ≤ 40V Reference Voltage (Note 4) , PD ≤ Pmax 10mA ≤ Io ≤ Imax,, 3.0 V ≤ VI - VO ≤ 40 V Line Regulation (Note 3) , 3.0 V ≤ VI - VO ≤ 40V Current Limit (VIN-VOUT) ≤15V Package CZ,CM Package CW Package CP Package CS Package CT Temperature Stability (Tlow ≤ TJ ≤ Thigh) Minimum Load Current to Maintain Regulation , (VI - VO = 40 V) RMS Noise, % of VO TA =25℃, 10 HZ ≤ f ≤ 10 KHZ Long-Term Stability, TJ = Thigh (Note 6) TA =25℃ for Endpoint Measurements ,1000hrs Thermal Resistance Junction to Case FIGURE 1 2 SYMBOL REGline REGload MIN. ------1.20 -TYP. 0.01 5.0 0.1 0.03 50 0.2 1.25 0.02 1.5 1 0.5 0.3 0.1 1 3.5 0.003 0.3 5.0 MAX. 0.04 25 0.5 0.07 100 5.0 1.30 0.07 UNIT %/V mV %V %W µA µA V %V 3 1.2 3 1 △IAdj IAdj Vref REGline A 3 3 -3 -- TS ILmin N S RθJC ------ -10 -1.0 -- % mA % % ℃ /W NOTES: (1) Tlow = -20℃ Thigh = + 85℃ (2) Imax = 1.5 A Pmax : TO-220=20W, TO-263=3W, TO-252=2W, SOP-8=0.625W, TO-92=0.625W, SOT23=0.625W (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) CAdj, when used, is connected between the adjustment pin and ground. (6) 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. 2-11 2002/10.rev.A PJ317 3-Terminal Adjustable Output Positive Voltage Regulator SCHEMATIC DIAGRAM FIGURE 1- LINE REGULATION AND LINE TEST CIRCUIT 3-11 2002/10.rev.A PJ317 3-Terminal Adjustable Output Positive Voltage Regulator 4-11 2002/10.rev.A PJ317 3-Terminal Adjustable Output Positive Voltage Regulator FIGURE 5-LOAD REGULATION FIGURE 6-CURRENT LIMIT FIGURE 7-ADJUSTMENT PIN CURRENT FIGURE 8-DROPOUT VOLTAGE FIGURE 9-TEMPERATURE STABILITY CURRENT FIGURE 10-MINIMUM OPERATING 5-11 2002/10.rev.A PJ317 3-Terminal Adjustable Output Positive Voltage Regulator FIGURE 11-RIPPLE REJECTION versus OUTPUT VOLTAGE FIGURE 12-RIPPLE REJECTION versus OUTPUT CURRENT FIGURE 13-RIPPLE REJECTION versus FREQUENCY FIGURE 14-OUTPUT IMPEDANCE FIGURE 9-TEMPERATURE STABILITY FIGURE 16-LOAD TRANSIENT RESPONSE 6-11 2002/10.rev.A PJ317 3-Terminal Adjustable Output Positive Voltage Regulator BASIC CIRCUIT OPERATION The PJ317 is a 3-terminal floating regulator. In operation, the PJ317 develops and maintains a nominal 1.25 volt 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 PJ317 was designed to control Iadj to less than 100 µA 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 PJ317 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. PROTECTION DIODES 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 PJ317 with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values (CO > 25 µF, 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. Although the PJ317 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 1 µF tantalum or 25 µF aluminum electrolytic capacitor on the output swamps this effect and insures stability. EXTERNAL CAPACITORS 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 10 volt application. The PJ317 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 7-11 2002/10.rev.A PJ317 3-Terminal Adjustable Output Positive Voltage Regulator regulation . The ground end of R2 can be returned near the load ground to provide remote ground sensing and improve load regulation. FIGURE 19 -"LABORATORY" POWER SUPPLY WITH ADJUSTABLE CURRENT LIMIT AND OUTPUT VOLTAGE FIGURE 20-ADJUSTABLE CURRENT LIMITER FIGURE 21-5V ELECTRONIC SHUT DOWN REGULATOR FIGURE 22-SLOW TURN-ON REGULATOR FIGURE 23-CURRENT REGULATOR 8-11 2002/10.rev.A PJ317 3-Terminal Adjustable Output Positive Voltage Regulator 9-11 2002/10.rev.A PJ317 3-Terminal Adjustable Output Positive Voltage Regulator 10-11 2002/10.rev.A PJ317 3-Terminal Adjustable Output Positive Voltage Regulator DIM A B C D F G K M P R MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27BSC 0.10 0.25 0° 7° 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.189 0.196 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.05BSC 0.004 0.009 0° 7° 0.229 0.244 0.010 0.019 11-11 2002/10.rev.A