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| PJ1431 Programmable Precision References he PJ1431 integrated circuits are three-terminal programmable shunt regulator diodes. These monolithic IC voltage references operate as a low temperature coefficient zener which is programmable from Vref to 36 volts with two external resistors. These devices exhibit a wide operating current range of 1.0 to 100mA with a typical dynamic impedance of 0.22.The characteristics of these references make FEATURES * * * * * * * * Programmable Output Voltage to 36 Volts Low Dynamic Output Impedance, 0.22 Type Sink Current Capability of 1.0 to 100 mA Equivalent Full-Range Temperature Coefficient of 50 ppm/ Typical Temperature Compensated for Operation over Full Rated Operating Temperature Range Low Output Noise Voltage SOT-23 T them excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies , and op amp circuitry. The 2.5 volt reference makes it convenient to obtain a stable reference from 5.0 volt logic supplies, and since The PJ1431 operates as a shunt regulator, it can be used as either a positive or negative tage reference. Pin: 1. Cathode 2. Reference 3. Anode QRDERING INFORMATION CIRCUIT SCHEMATIC Device Operating Temperature (Ambient) PJ1431CX -20+85 SOT-23 Package MAXIMUM RATINGS (Full operating ambient temperature range applies unless otherwise noted.) Rating Symbol VKA IK Iref TJ TA Tstg PD PD Cathode To Anode Voltage Cathode Current Range, Continuous Reference Input Current Range, Continuous Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range Total Power Dissipation @ TA = 25 Derate above 25 Ambient Temperature PJ1431CX Total Power Dissipation @ TC = 25 Derate above 25 Case Temperature PJ1431CX w w w da . ta he s et u. 4 om c Value 37 -100 to +150 -0.05 to +10 150 -20 to +85 -65 to +150 0.30 0.7 Unit V mA mA W W 1-9 2002.ver.A www..com PJ1431 Programmable Precision References THERMAL CHARACTERISTICS Characteristics Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Symbol RJA RJC Min 178 83 Max 114 41 Unit /W /W RECOMMENDED OPERATING CONDITIONS Condition/Value Cathode To Anode Voltage Cathode Current Symbol VKA IK Min Vref 1.0 Max 36 100 Unit V mA ELECTRICAL CHARACTERISTICS ( Ambient temperature at 25 unless otherwise noted ) PJ1431 Typ Characteristic Reference Input Voltage (Figure 1) VKA = Vref , IK = 10 mA TA = +25 TA = Tlow to Thigh (Note 1) Reference Input Voltage Deviation Over Temperature Range (Figure 1, Note 1,2,4) VKA = Vref , IK = 10 mA Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage IK = 10 mA (Figure 2), VKA = 10V to Vref VKA = 36V to 10V Reference Input Current (Figure 2) IK = 10 mA, R1 = 10 k, R2 = TA = +25 TA = Tlow to Thigh (Note 1) Reference Input Current Deviation Over Temperature Range (Figure 2, Note 1,4) IK = 10 mA, R1 = 10 k, R2 = Minimum Cathode Current for Regulation VKA = Vref (Figure 1) Off-State Cathode Current (Figure 3) VKA = 36 V, Vref = 0V Dynamic Impedance (Figure 1, Note 3) VKA = Vref, IK = 1.0 mA to 100 mA, f 1.0 kHz Symbol Vref Min Max Unit V Vref 2.475 2.458 -- 2.500 -3.0 2.525 2.542 17 mV Vref VkA Iref mV --- 1.4 - 1.0 - 2.7 -.2.0 A ---0.7 -0.4 4.0 5.2 1.2 Iref A Imin Ioff | Zke | ---- 0.5 2.6 0.22 1.0 1000 0.5 mA nA 2-9 2002.ver.A PJ1431 Programmable Precision References 1 Tlow = -20 , FIGURE 1 -- TEST CIRCUIT FOR VKA = vref Thigh = +85 2 The deviation parameter Vref is defined as the differences between the maximum and minimum values obtained over the full operating ambient temperature range the applies. FIGURE 2 -- TEST CIRCUIT FOR VKA > Vref The average temperature coefficient of the reference input voltage, Vref , is defined as : (Vref ) Vref Vref x 10 6 ppm Vref @ 25C = x 10 6 = C T A TA (Vref @ 25C) Vref can be positive of negative depending on whether Vref Min of Vref Max occurs at the lower ambient temperature. (Refer to Figure 6) Example: Vref = 8.0 mV and slope is positive, Vref @ 25 = 2.5V, TA = 85 Vref = 3 0.008 x 10 6 = 45.8ppm / C 70(2.5) R VkA = Vref 1 + 1 + I ref * R 1 R 2 The dynamic impedance Zka is defined as: FIGURE 3 -- TEST CIRCUIT FOR Ioff Z ka = VKA I K When the device is programmed with two external resistors, R1 and R2, (refer to Figure 2) the total dynamic impedance of the circuit is defined as: R Z ka Z ka 1 + 1 R 2 4 This test is not applicable to surface mount (D suffix) devices. 3-9 2002.ver.A PJ1431 Programmable Precision References FIGURE 4-CATHODE CURRENT versus CATHODE VOLTAGE FIGURE 5-CATHODE CURRENT versus CATHODE VOLTAGE FIGURE 6-REFERENCE INPUT VOLTAGE versus AMBIENT TEMPERATURE FIGURE 7-REFERENCE INPUT CURRENT versus AMBIENT TEMPERATURE FIGURE 8-CHANGE IN REFERENCE INPUT VOLTAGE versus CATHODE VOLTAGE FIGURE 9 -OFF.STATE CATHODE CURRENT versus AMBIENT TEMPERATURE 4-9 2002.ver.A PJ1431 Programmable Precision References FIGURE 10 - DYNAMIC IMPEDANCE VERSUS FREQUENCY FIGURE 11 - DYNAMIC IMPEDANCE VERSUS AMBIENT TEMPERATURE FIGURE 12 - OPEN LOOP VOLTAGE GAIN VERSUS FREQUENCY FIGURE 13 - SPECTRAL NOISE DENSITY FIGURE 14 - PULSE RESPONSE FIGURE 15 - STABILITY BOUNDARY CONDITIONS 5-9 2002.ver.A PJ1431 Programmable Precision References FIGURE 16-TEST CIRCUIT FOR CURVE A OF STABILITY BOUNDARY CONDITIONS FIGURE 17-TEST CIRCUIT FOR CURVES B.C. AND D OF STABILITY BOUNDARY CONDITIONS FIGURE 18-SHUNT REGULATOR FIGURE 19-HIGH CURRENT SHUNT REGULATOR FIGURE 20-OUTPUT CONTROL OF A THREE-TERMINAL FIXED EGULATOR FIGURE 21-SERIES PASSEGULATOR 6-9 2002.ver.A PJ1431 Programmable Precision References FIGURE 22-CONSTANT CURRENT SOURCE FIGURE 23-CONSTANT CURRENT SINK FIGURE 24-TRIAC CROWBAR FIGURE 25-SCR CROWBAR FIGURE 26-VOLTAGE MONITOR FIGURE 27-SINGLE-SUPPLY COMPARATOR WITH TEMPERATURE-COMPENSATED THRESHOLD L.E.D. indicator is "on" when V+ is between the upper and lower limits. Vin Vout V+ 2.0V 7-9 2002.ver.A PJ1431 Programmable Precision References FIGURE 28-LINER OHMMETER FIGURE 29-SIMPLE 400mW PHONO AMPLIFIER FIGURE 30-HIGH EFFICIENCY STEP-DOWN SWITCHING CONVERTER TEST Line Regulation Load Regulation Output Ripple Output Ripple Efficiency CONDITIONS Vin=10V to 20V, Io=1.0A Vin=15V, Io=0A to 1.0A Vin=10V,Io=1.0A Vin=20V, Io=1.0A Vin=15V, Io=1.0A RESULTS 53mV (1.1%) 25mV (0.5%) 50mVp-p P.A.R.D. 100mVp-p P.A.R.D. 82% 8-9 2002.ver.A PJ1431 Programmable Precision References A B F SOT-23 DIMENSION DIM A B MILLIMETERS MIN 2.88 0.39 1.78 0.51 1.59 1.04 0.07 MAX 2.91 0.42 2.03 0.61 1.66 1.08 0.09 MIN 0.113 0.015 0.070 0.020 0.063 0.041 0.003 INCHES MAX 0.115 0.017 0.080 0.024 0.065 0.043 0.004 E C D G D C E F G 9-9 2002.ver.A |
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