NCP100SNT1

NCP100 Sub 1.0 V Precision Adjustable Shunt Regulator The NCP100 is a precision low voltage shunt regulator that is programmable over a voltage range of 0.9 V to 6.0 V. This device features a guaranteed reference accuracy of ±1.7% at 25°C and ±2.6% over the entire temperature range of −40°C to 85°C. The NCP100 exhibits a sharp low current turn−on characteristic with a low dynamic impedance of 0.20 W over an operating current range of 100 mA to 20 mA. These characteristics make this device an ideal replacement for zener diodes in numerous application circuits that require a precise low voltage reference. When combined with an optocoupler, the NCP100 can be used as an error amplifier for controlling the feedback loop in isolated low output voltage (2.3 V) switching power supplies. This device is available in an economical space saving TSOP−5 package. Features http://onsemi.com 5 1 TSOP−5 SN SUFFIX CASE 483 • • • • • • • • • • • Programmable Output Voltage Range of 0.9 V to 6.0 V Voltage Reference Tolerance of ±1.7% Sharp Low Current Turn−ON Characteristic Low Dynamic Output Impedance of 0.2 W from 100 mA to 20 mA Wide Operating Current Range of 80 mA to 20 mA Space Saving TSOP−5 Package Pb−Free Package is Available PIN CONNECTIONS AND MARKING DIAGRAM NC Anode Cathode 1 RABYW 4 (Top View) RAB = Device Code Y = Year W = Work Week Reference 2 3 5 Anode Applications Reference for Single Cell Alkaline, NiCD and NiMH Applications Low Output Voltage (2.3 V) Switching Power Supply Error Amp Battery Powered Consumer Products Portable Test Equipment and Instrumentation Cathode (K) Cathode (K) Reference (R) 0.7 V Anode (A) Anode (A) Device ORDERING INFORMATION Package TSOP−5 TSOP−5 (Pb−Free) Shipping† 3000 / Tape & Reel 3000 / Tape & Reel NCP100SNT1 NCP100SNT1G Reference (R) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. Figure 1. Symbol Figure 2. Representative Block Diagram © Semiconductor Components Industries, LLC, 2004 1 July, 2004 − Rev. 8 Publication Order Number: NCP100/D NCP100 MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.) ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁ Cathode to Anode Voltage (Note 1) VKA IK 7.0 V Cathode Current Range, Continuous (Note 2) −20 to 25 mA mA Reference Input Current Range, Continuous (Note 1) Thermal Resistance Junction−to−Air IREF −0.05 to 2.0 225 RqJA TJ °C/W °C °C Operating Junction Temperature Range Storage Temperature Range −40 to 125 −65 to 150 Tstg Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. 1. This device series contains ESD protection and exceeds the following tests: Human Body Model 4000 V per JESD−22, Method A114B. Machine Model Method 400 V. 2. The maximum package power dissipation limit must not be exceeded. TJ(max) * TA PD + RqJA Rating Symbol Value Unit RECOMMENDED OPERATING CONDITIONS ÁÁÁ Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁ Á Á Á ÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁ Á Cathode to Anode Voltage Range Cathode Current Range VKA IK 0.9 0.1 6.0 20 V mA Condition Symbol Min Max Unit http://onsemi.com 2 NCP100 ELECTRICAL CHARACTERISTICS (TA = 25°C, unless otherwise noted.) ÁÁÁ Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁ Á Á Á Á Á ÁÁÁ Á Á Á Á ÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁ Á Á Á Á ÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Reference Voltage (IKA = 10 mA, Figure 3) VKA = 0.9 V TA = 25°C TA = 0°C to 70°C TA = −40°C to 85°C VKA = 1.0 V TA = 25°C TA = 0°C to 70°C TA = −40°C to 85°C VREF V 0.684 0.682 0.678 0.686 0.684 0.680 − 0.696 − − 0.698 − − 1.0 0.708 0.710 0.714 0.710 0.712 0.716 12 Reference Input Voltage Change Over Temperature VKA = 1.0 V, IK = 10 mA, TA = −40°C to 85°C, Figure 3 (Notes 3, 4) DVREF mV mV Reference Input Voltage Change Over Programmed Cathode Voltage (IK = 10 mA, Figure 3) VKA = 0.9 V to 1.0 V VKA = 1.0 V to 6.0 V Regline −3.0 0 − 0.2 6.7 1.3 3.0 12 2.4 Ratio of Reference Input Voltage Change to Cathode Voltage Change VKA = 0.9 V to 6.0 V, IK = 10 mA, Figure 3 Reference Input Current (VKA = 1.0 V, IK = 10 mA) Minimum Cathode Current for Regulation DVREF DVKA IREF mV/V −100 − − − −30 80 70 100 − nA mA mA W IK(min) IK(off) |ZKA| Cathode Off−State Current (VKA = 6.0 V, VREF = 0 V) 90 − Dynamic Output Impedance VKA = 1.0 V, IK = 100 mA to 20 mA, f v 1.0 kHz, Figure 3 0.2 3. Low duty cycle pulse techniques are used during testing to maintain the junction temperatures as close to ambient as possible. 4. The DVREF parameter is defined as the difference between the maximum and minimum values obtained over the ambient temperature range of −40°C to 85°C. VREF (max) DVREF = VREF (max) − VREF (min) DTA = T2 − T1 VREF (min) T1 T2 AMBIENT TEMPERATURE Characteristic Symbol Min Typ Max Unit http://onsemi.com 3 NCP100 1.0 k Vin IK VKA Vin 1.0 k VKA IK + 22 mF R1 + CL 10 k 100 k VREF R2 VREF Figure 3. General Test Circuit Figure 4. Test Circuit for Reference Input Voltage Change vs. Cathode Voltage 110 k IK VKA CL + + 22 mF 100 k 0.1 mF 0.01 mF Input + 1.0 k Output IK R1 50 k R1 100 k Figure 5. Test Circuit for Dynamic Impedance vs. Frequency Figure 6. Test Circuit for Spectral Noise Density REFERENCE INPUT VOLTAGE CHANGE (%) 1.0 VKA = 0.9 V CATHODE VOLTAGE CHANGE (%) IK = 250 mA f v 1.0 kHz CL = 22 mF Figure 3 VKA = 1.0 V 2.0 1.0 VKA = 0.9 V IK = 250 mA f v 1.0 kHz CL = 22 mF Figure 3 0 0 VKA = 6.0 V −1.0 VKA = 1.0 V VKA = 6.0 V VKA = 0.9 V VKA = 6.0 V −2.0 −50 −25 0 25 50 75 100 125 −1.0 −50 −25 0 25 50 75 100 125 TA, TEMPERATURE (C°) TA, TEMPERATURE (C°) Figure 7. Reference Input Voltage Change vs. Ambient Temperature Figure 8. Cathode Voltage Change vs. Ambient Temperature http://onsemi.com 4 NCP100 20 IK, CATHODE CURRENT (mA) IK, CATHODE CURRENT (mA) 15 10 5.0 0 −5.0 −10 −0.8 −0.6 −0.4 −0.2 VKA = 1.0 V CL = 3.3 mF TA = 25°C Figure 3 200 150 100 50 0 −50 VKA = 1.0 V CL = 3.3 mF TA = 25°C Figure 3 IK(min) 0 0.2 0.4 0.6 0.8 1.0 1.2 −100 −0.6 −0.4 −0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 VKA, CATHODE VOLTAGE (V) VKA, CATHODE VOLTAGE (V) Figure 9. Cathode Current vs. Cathode Voltage Figure 10. Cathode Current vs. Cathode Voltage DVREF, REFERENCE INPUT VOLTAGE CHANGE (mV) 8.0 |ZKA|, DYNAMIC IMPEDANCE (W) IK = 10 mA CL = 22 mF TA = 25°C Figure 4 10 VKA = 1.0 V IK = 9.5 mA to 10.5 mA CL = 3.3 mF TA = 25°C Figure 5 6.0 1.0 4.0 0.1 2.0 0 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 0.01 1.0 10 100 FREQUENCY (Hz) 1.0k 10k VKA, CATHODE VOLTAGE (V) Figure 11. Reference Input Voltage Change vs. Cathode Voltage Figure 12. Dynamic Impedance vs. Frequency 50 GAIN AV, VOLTAGE GAIN (dB) 30 120 EXCESS PHASE (°) VREF, REFERENCE VOLTAGE (mV) 706 60 PHASE 700 TA = −40°C = 25°C 10 0 694 −10 VKA = 1.0 V IK = 10 mA TA = 25°C 100 1.0k 10k 100k −60 688 = 70°C = 85°C = 105°C 50 100 150 200 f ≤ 1.0 kHz CL = 3.3 mF Figure 3 250 300 −30 10 −120 1.0 M 682 FREQUENCY (Hz) IK, CATHODE CURRENT (mA) Figure 13. Small−Signal Voltage Gain and Phase vs. Frequency Figure 14. Reference Voltage vs. Cathode Current for VKA = 0.9 V http://onsemi.com 5 NCP100 698 VREF, REFERENCE VOLTAGE (mV) TA = −40°C VREF, REFERENCE VOLTAGE (mV) 708 = 105°C 704 697 = 25°C = 70°C = 85°C = 105°C f ≤1.0 kHz CL = 3.3 mF Figure 3 696 50 100 150 200 250 300 700 = 70°C = 85°C 696 = 25°C TA = −40°C f ≤ 1.0 kHz CL = 22 mF Figure 3 200 250 300 692 50 100 150 IK, CATHODE CURRENT (mA) IK, CATHODE CURRENT (mA) Figure 15. Reference Voltage vs. Cathode Current for VKA = 1.0 V Figure 16. Reference Voltage vs. Cathode Current for VKA = 6.0 V 714 VREF, REFERENCE VOLTAGE (mV) 710 = 25°C 706 702 698 694 690 0 TA = −40°C f ≤ 1.0 kHz Figure 3 CL = 22 mF 4.0 6.0 = −40°C = 85°C = 70°C = 105°C 1000 NOISE VOLTAGE (nV/pHz) VKA = 1.0 V IK = 10 mA CL = 3.3 mF TA = 25°C Figure 6 800 600 400 200 2.0 0 10 100 1.0 k FREQUENCY (Hz) 10 k 100 k VKA, CATHODE VOLTAGE (V) Figure 17. Reference Voltage vs. Cathode Current Figure 18. Spectral Noise Density 6.0 VKA, CATHODE VOLTAGE (V) 5.0 4.0 3.0 2.0 1.0 NON−OPERATIONAL 0 1.0 10 CL, LOAD CAPACITANCE (mF) 100 0 200 400 600 800 1000 1200 1400 1600 t, TURN−ON TIME (ms) STABLE OPERATION VIN (V) 0 2.0 0 VKA (V) UNSTABLE OPERATION IK = 0.08 mA to 30 mA CESR ≤ 4.0 W TA = −40°C to 85°C 1.0 IK = 10 mA CL = 3.3 mF TA = 25°C 0.5 Figure 19. Stability Boundary Conditions Figure 20. Turn−On Time http://onsemi.com 6 NCP100 APPLICATIONS INFORMATION The NCP100 is an adjustable shunt regulator similar to the industry standard 431−type regulators. Each device is laser trimmed at wafer probe to allow for tight reference accuracy and low reference voltage shift over the full operating temperature range of −40°C to +85°C (Figure 7). The nominal value for the reference is 0.698 V. This lower voltage allows the device to be used in low voltage applications where the traditional 1.25 V and 2.5 V references are not suitable. Rin Vin IK CL R2 VREF VKA LOAD In Figure 21, the input resistor (Rin) is nominally set to 1.0 kW. For proper operation, once Vin, R1 and R2 are set, the resistance and power value of Rin can be determined by the following equation. Rin + Vin * VKA IK ) IL ) VKA R 1)R 2 R1 The maximum current that will flow through Rin must be determined. This is the sum of the maximum values of cathode current, resistor divider network current, and load current. With Vin, set, the difference (Vin−VKA) is now constant. This value is divided by the maximum current calculated above to arrive at the value of Rin. Once the value of Rin is calculated, it’s minimum power rating is easily derived by: Pin + (Iin)2 Rin Figure 21. Typical Application Circuit The typical application circuit for this device is shown in Figure 21. The cathode voltage can be programmed between 0.9 V to 6.0 V to allow for proper operation by setting the R1/R2 resistor divider network values. The following equation can be used in calculating the cathode voltage (VKA). Note, if VKA is known then the ratio of R1 and R2 can be determined from this equation as well. VKA + VREF 1 ) R1 ) IREF R1 R2 The table below shows the required R1/R2 values using 1.0% resistors for commonly used voltages. VKA (V) 0.9 1.0 1.8 3.3 5.0 6.0 R1 (kW) 30 R2 (kW) 100 100 100 100 100 100 Once these values are determined, it should be verified that the minimum and maximum values of IK are within the recommended range of 0.1 mA to 20 mA under the worst case conditions. For stability, the NCP100 requires an output capacitor between the cathode and anode. Figure 19 shows the capacitance boundary values required for stable operation across the −40°C to 85°C temperature range. The goal is to remain to the right of the curve for any programmed cathode voltages. For example, if the VKA is programmed to 1.0 V, then a load capacitor value of 3.0 mF or greater would be selected. The load capacitor’s Equivalent Series Resistance, ESR, should be less than 4.0 W. Both the capacitance and ESR values should be checked across the anticipated application temperature range to insure that the values meet the requirements stated above. Vin 1.0 k Iin ÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ 43.2 158 374 619 750 Vcomp R1 Rcomp VKA IK + CL 100 k VREF Because the error amplifier is a CMOS design the value of IREF is extremely low allowing it to be neglected for most applications. The low IREF also allows for higher R1 and R2 values keeping current consumption very low. The NCP100 is especially well suited for lower voltage applications, particularly at VKA = 1.0 V. As is seen in Figures 7 and 8, this device exhibits excellent cathode and reference voltage flatness across the −40°C to +85°C temperature range. Figure 22. Negative Dynamic Impedance Circuit One unique use for the NCP100 is that it can be configured for negative dynamic impedance as shown in Figure 22. This circuit is equivalent to Figure 21 with the addition of a small value resistor Rcomp in the cathode circuit. The regulated voltage output remains across the NCP100 cathode and anode leads. The voltage programming and stability requirements remain the same as in the typical application shown in Figure 21. http://onsemi.com 7 NCP100 The circuit performs the same as the one in Figure 21 with the exception of the effects of Rcomp. As IK increases, the voltage across Rcomp also increases by: Vcomp + IKA Rcomp Vcomp effectively adjusts the NCP100 programmed VKA voltage slightly down since the R1/R2 voltage divider will try to hold the point it is connected to at the programmed voltage. The regulator VKA will now be lowered by the value of the Vcomp. This effect can compensate for the NCP100’s intrinsic positive impedance versus cathode current (IK) to allow for 0 W or even a negative dynamic impedance. Figure 23 shows this phenomenon for a program voltage of 1.0 V. The NCP100 intrinsic positive dynamic impedance response is the Rcomp = 0 W curve. A 0 W dynamic impedance regulator response is realized with Rcomp = 0.15 W. Negative dynamic impedance responses are achieved with Rcomp u 0.15 W. Figure 24 shows the characteristic at a programmed VKA of 6.0 V. The 0 W dynamic impedance value corresponds to Rcomp = 2.9 W. Figure 25 shows the dynamic impedance versus cathode compensation resistance for programmed voltages of 1.0 V, 3.3 V and 6.0 V. It can be seen that any value up to the positive intrinsic dynamic impedance of the NCP100 can be realized. The other limit is that with a high enough negative dynamic impedance, the NCP100 V may drop below the minimum operating VKA voltage of 0.9 V, which can result in unpredictable performance. 20 = 2.9 W = 1.5 W 15 =0W 10 Rcomp= 5.8 W 5.0 IK = 0.1 to 20 mA TA = 25° C Figure 22 5.96 5.98 6.00 6.02 Rcomp W 0 1.5 2.9 4.4 5.8 6.04 |ZKA| W 2.9 1.4 0 −1.6 −2.9 6.06 20 IK, CATHODE CURRENT (mA) Rcomp= 3.1 W = 1.5 W = 0.15 W IK, CATHODE CURRENT (mA) = 4.4 W 15 Rcomp (W) 0 0.15 1.5 3.1 |ZKA| (W) 0.2 0 −1.4 −1.6 IK = 0.1 mA to 20 mA TA = 25° C Figure 22 0 0.94 0.95 0.96 0.97 0.98 =0W 10 5.0 0.99 1.00 1.01 0 5.94 VKA, CATHODE VOLTAGE (V) VKA, CATHODE VOLTAGE (V) Figure 23. Cathode Current vs. Cathode Voltage for Programmed VKA = 1.0 V Figure 24. Cathode Current vs. Cathode Voltage for Programmed VKA = 6.0 V 3.0 |ZKA|, DYNAMIC IMPEDANCE (W) 2.0 = 6.0 V 1.0 0 −1.0 VKA= 1.0 V −2.0 −3.0 0 = 3.3 V IK = 1.0 mA to 20 mA f ≤1.0 kHz Figure 22 TA = 25° C 1.0 2.0 3.0 4.0 5.0 Rcomp, CATHODE COMPENSATION RESISTANCE (W) Figure 25. Dynamic Impedance vs. Cathode Compensation Resistance http://onsemi.com 8 NCP100 Rin R1 Vin Vout Vin R1 Vout R2 R2 V out + 1 ) R1 V REF R2 REF V out + 1 ) R1 V REF R2 be V out min + 0.9 V ) V V out min + V Figure 26. High Current Shunt Regulator Figure 27. Low Dropout Series Pass Regulator AC Line Input 1/2 Opto R1 Isolated DC Output NCP 100 − + UC3842 R2 − 1/2 Opto Minimum Vout = (0.9 + 1.4) = 2.3 V + S Q − + − + R Figure 28. Offline Converter with Isolated DC Output The circuit in Figure 28 uses the NCP100 as a compensated amplifier for controlling the feedback loop of an isolated output line powered converter. This device allows the converter to directly regulate the output voltage at a significantly lower level than obtainable with the common TL431 device family. The output voltage is programmed by the resistors R1 and R2. The minimum regulated DC output is limited to the sum of the lowest allowable cathode to anode voltage (0.9 V) and the forward drop of the optocoupler light emitting diode (1.4 V). http://onsemi.com 9 + − + NCP100 PACKAGE DIMENSIONS TSOP−5 SN SUFFIX PLASTIC PACKAGE CASE 483−02 ISSUE C D 5 1 2 4 3 S B NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. 4. A AND B DIMENSIONS DO NOT INCLUDE MOLD FLASH, PROTRUSIONS, OR GATE BURRS. MILLIMETERS INCHES DIM MIN MAX MIN MAX A 2.90 3.10 0.1142 0.1220 B 1.30 1.70 0.0512 0.0669 C 0.90 1.10 0.0354 0.0433 D 0.25 0.50 0.0098 0.0197 G 0.85 1.05 0.0335 0.0413 H 0.013 0.100 0.0005 0.0040 J 0.10 0.26 0.0040 0.0102 K 0.20 0.60 0.0079 0.0236 L 1.25 1.55 0.0493 0.0610 M 0_ 10 _ 0_ 10 _ S 2.50 3.00 0.0985 0.1181 L G A J C 0.05 (0.002) H K M SOLDERING FOOTPRINT* 1.9 0.074 0.95 0.037 2.4 0.094 1.0 0.039 0.7 0.028 SCALE 10:1 mm inches *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. 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