TND308 Graphical Data Test Circuits for the NCP1651 Prepared by Alan Ball ON Semiconductor Applications Engineering http://onsemi.com The following circuits are the test configurations that were used to obtain the data for the graphical section of the NCP1651/D data sheet. Each graph has a schematic associated with it and in some cases a description of the procedure. 1.5 V 10 Ref Fltr 9 AC Input GND 2 470 pF NCP1651 11 AC Comp 8 FB/SD 14 V 1 F 1 Output 5 IS+ Iavg Iavg fltr 7 6 Ramp CT Comp 3 4 8 FB/SD 11 AC Comp + 0–1 V 0.5 nF R8 4.7 k 470 pF 1 Output 5 IS+ Iavg Iavg fltr 14 V 1 F 1 nF 7 6 Ramp CT Comp 3 4 47 k Figure 2. FB/SD V–I Characteristics Re: NCP1651/D data sheet, Figure 5 Figure 1. Current Sense Amplifier Gain Re: NCP1651/D data sheet, Figure 4 Using a decade resistance box for R8, set it to 1 M. Turn on the 14 volt source. Cycle it down to 8 volts and back up to 14 to turn the unit on. Read the voltage and pin 8 and note the resistance. Reduce R8 until the unit shuts down. Calculate the current for each reading. Energize all three power sources, beginning with the 14 volt supply. Cycle the 14 volt supply down to 8 volts and back to 14 to start unit operating. Adjust power supply on pin 5 and read voltages on pins 6 and 7. May, 2002 – Rev.0 10 Ref Fltr 9 AC Input GND 2 47 k Semiconductor Components Industries, LLC, 2002 12 0.1 F Vref 13 VCC 16 Startup NCP1651 12 0.1 F Vref 13 VCC 16 Startup APPLICATION NOTE 1 Publication Order Number: TND308/D TND308 A 10 Ref Fltr 9 AC Input 1 F 1 Output 5 IS+ Iavg Iavg fltr 1 nF 11 AC Comp 8 FB/SD 7 6 10 Ref Fltr 9 AC Input Ramp CT Comp 3 4 GND 2 470 pF V 1.5 V 12 0.1 F Vref 10 Ref Fltr 9 AC Input GND 2 470 pF NCP1651 11 AC Comp 8 FB/SD Iavg fltr 1 Output 5 IS+ Iavg Iavg fltr 47 k Figure 4. Startup Leakage Re: NCP1651/D data sheet, Figure 8 Device needs to be non–operational for this test. Begin with curve tracer set to about 20 volts for low voltage readings. As unit heats up, currents will drop. V 13 VCC 16 Startup 1 nF 7 6 Iavg 470 pF 47 k Apply voltage from 1.5 volt source. Begin with VCC at 0 volts and take current readings over a range of 0 to 11 volts. Reduce VCC to 8 volts, and then increase to 12 volts, unit should begin operation. Reduce voltage to approximately 10 volts and take current readings up to 18 volts. If unit shuts down before 10 volts, note shutdown voltage. Recycle input power (VCC to 12 volts, 8 volts and 12 again) and adjust VCC to just above shutdown threshold and take readings. A 1 Output 5 IS+ Ramp CT Comp 3 4 GND 2 Figure 3. Bias Current versus VCC Re: NCP1651/D data sheet, Figures 6 and 7 0–500 V 12 0.1 F Vref 13 VCC 16 Startup Curve Tracer NCP1651 NCP1651 11 AC Comp 8 FB/SD 1.5 V VCC 12 0.1 F Vref 13 VCC 16 Startup A VCC 13 VCC 16 Startup 1 F 12 0.1 F Vref 1 nF 11 AC Comp 8 FB/SD 7 6 1.5 V Ramp CT Comp 3 4 10 Ref Fltr 9 AC Input GND 2 470 pF 47 k NCP1651 V 1 Output 5 IS+ Iavg Iavg fltr VCC 1 F 1 nF 7 6 Ramp CT Comp 3 4 47 k Figure 6. UVLO Thresholds Re: NCP1651/D data sheet, Figure 10 Figure 5. Startup Current and Leakage Re: NCP1651/D data sheet, Figure 9 Apply voltage from 1.5 volt source. Turn on VCC and bring up to 12 volts. Reduce it to 8 volts and then increase it slowly to the point when the unit begins operation. At that point the input current will jump from about 0.5 mA to roughly 5 mA. Decrease the VCC voltage until the VCC current drops back to 0.5 mA, this is the turn–off voltage. Apply voltage from 1.5 volt source. Turn on VCC and bring up to 12 volts. Reduce it to 8 volts and then increase it back to 12 volts. Adjust high voltage to 500 volts and take current measurement. http://onsemi.com 2 TND308 Iavg fltr 7 6 1 F 470 pF 4.7 k 47 k 11 AC Comp 8 FB/SD 10 Ref Fltr 9 AC Input GND 2 470 pF 1 Output 5 IS+ Iavg Iavg fltr Iavg fltr 7 6 0.5 nF 12 0.1 F Vref 13 VCC 16 Startup Ccharge VCC Vref NCP1651 Startup Iavg 4.7 k Energize the 14 volt bias supply, and then the other two supplies on pins 8 and 9. Adjust pin 8 to about 1 volt, then reduce the 14 volt supply to 8 volts and back up to 14. This will start the chip operating. Adjust the supplies on pins 8 and 9, and measure the voltage on pin 10. + 0.1 F 1 F Figure 8. Reference Multiplier Family of Curves Re: NCP1651/D data sheet, Figure 12 Begin with VCC at 0 volts and increase to 11 volts taking measurements at frequent intervals. This will not allow the chip to go into the operational mode, as that would turn off the clamp. 13 12 14 V 1 Output 5 IS+ Ramp GND CT Comp 2 3 4 0–5 V 470 pF 47 k V Figure 7. Clamp Voltage versus VCC Re: NCP1651/D data sheet, Figure 11 + 50 Vdc 16 10 Ref Fltr 9 AC Input 0.5 nF Ramp CT Comp 3 4 GND 2 11 AC Comp 8 FB/SD 0–5 V NCP1651 1 F 1 Output 5 IS+ Iavg 12 0.1 F Vref 13 VCC 16 Startup 1 nF 11 8 7 6 10 1.5 V Ramp CT Comp 3 4 9 AC Comp FB/SD Ref Fltr AC Input GND 2 CT 47 k NCP1651 10 Ref Fltr 9 AC Input NCP1651 11 AC Comp 8 FB/SD V VCC 12 0.1 F Vref 13 VCC 16 Startup 14 V 1 F 1 Output 5 IS+ Iavg Iavg fltr 7 6 Ramp CT Comp 3 4 47 k Figure 10. Frequency versus CT Re: NCP1651/D data sheet, Figure 14 Figure 9. Turn–on Time Re: NCP1651/D data sheet, Figure 13 Using a series of capacitors from 1 F to 1000 F, apply the 50 volt supply with a rise time of less than 100 s. Measure time required for the VCC cap to charge to its peak. This is the point at which the chip will start operating if possible. Since this is not an operable configuration, VCC will then decay to the turn off threshold. Apply both voltage sources, reduce the 14 volt source to 8 volts and then increase to 14 volts. Measure frequency. Repeat for various values of CT, and measure the frequency at pin 4. Do not measure directly from pin 3, as the impedance of the measuring device will cause errors in the reading. http://onsemi.com 3 TND308 10 1.5 V 9 Ref Fltr AC Input GND 2 1 Output 5 IS+ 8 7 Iavg 6 Iavg fltr 10 2.5 V 10 1.5 V 9 FB/SD AC Comp Ref Fltr 12 Vref NCP1651 8 0.1 F 1 Output 5 IS+ Iavg Iavg fltr 1 F 1 Output 5 IS+ Iavg Iavg fltr 7 6 Ramp CT Comp 3 4 CT 47 k 47 k Figure 12. Maximum Duty Cycle versus Frequency Re: NCP1651/D data sheet, Figure 16 Apply both voltage sources, reduce the 14 volt source to 8 volts and then increase to 14 volts. Measure ramp peak at pin 3 with an oscilloscope for various values of CT. 11 AC Input GND 2 Figure 11. Ramp Peak versus Frequency Re: NCP1651/D data sheet, Figure 15 13 VCC 16 Startup Ref Fltr 9 Ramp CT Comp 3 4 CT FB/SD AC Comp 11 14 V 12 0.1 F Vref 13 VCC 16 Startup NCP1651 FB/SD AC Comp 14 V 1 F Apply both voltage sources, reduce the 14 volt source to 8 volts and then increase to 14 volts. Measure frequency and duty cycle, using an oscilloscope on pin 1, for various values of CT. 0.1 F 14 V 13 VCC 16 Startup 1 F CL 8 11 7 6 10 1.5 V AC Input Ramp GND CT Comp 2 3 4 470 pF 47 k 9 FB/SD AC Comp Ref Fltr AC Input GND 2 470 pF 12 Vref NCP1651 8 11 NCP1651 12 0.1 F Vref 13 VCC 16 Startup 680 14 V 1 F 1 Output 5 IS+ Iavg Iavg fltr 7 6 Ramp CT Comp 3 4 47 k Figure 14. Vref Transient Response Re: NCP1651/D data sheet, Figure 18 Figure 13. Driver Rise and Fall Times versus Capacitance Re: NCP1651/D data sheet, Figure 17 Apply both voltage sources, reduce the 14 volt source to 8 volts and then increase to 14 volts. Adjust the voltage of the 1.5 volt source for approximately 50% duty cycle on the output driver pin. Measure the waveform on pin 1 with an oscilloscope for the 10% and 90% rise and fall time. Change CL as required. Apply both voltage sources, reduce the 14 volt source to 8 volts and then increase to 14 volts. Adjust the voltage of the 1.5 volt source for approximately 50% duty cycle on the output driver pin. Measure the waveform on pin 12 with an oscilloscope. http://onsemi.com 4 TND308 10 1.5 V 9 Ref Fltr AC Input GND 2 470 pF 1 Output 5 IS+ 8 11 7 Iavg 6 Iavg fltr 10 1.5 V 9 Ramp CT Comp 3 4 Ref Fltr AC Input GND 2 470 pF 47 k Apply both voltage sources, reduce the 14 volt source to 8 volts and then increase to 14 volts. Measure the frequency at pin 1 using an oscilloscope or frequency counter. 10 mA 5 mA 2 mA 8 FB/SD 11 AC Comp 1.5 V Iavg Iavg fltr 7 6 Ramp CT Comp 3 4 47 k 14 V 13 VCC 16 Startup 3.25 k 1 Output 5 IS+ Apply both voltage sources, reduce the 14 volt source to 8 volts and then increase to 14 volts. Measure ramp peak at pin 3 with an oscilloscope. A 0 mA 14 V 1 F Figure 16. Ramp Peak versus Temperature Re: NCP1651/D data sheet, Figure 21 Figure 15. Frequency versus Temperature Re: NCP1651/D data sheet, Figures 19 and 20 0.65 k 1.30 k FB/SD AC Comp NCP1651 AC Comp FB/SD 12 0.1 F Vref 13 VCC 16 Startup 1 F 10 Ref Fltr 9 AC Input GND 2 0.1 F 12 Vref NCP1651 8 NCP1651 11 14 V 12 0.1 F Vref 13 VCC 16 Startup V 1 F V 1 Output 5 IS+ Iavg Iavg fltr 7 6 Ramp CT Comp 3 4 470 pF 47 k Figure 17. Vref Line/Load Regulation Re: NCP1650/D data sheet, Figures 22 and 23 Apply both voltage sources, reduce the 14 volt source to 8 volts and then increase to 14 volts. To measure load regulation, hold the VCC voltage constant and vary the load, measuring Vref a load current at various loads between 0 and 10 mA. To measure line regulation, hold the load constant and measure Vref and VCC at various VCC levels between 10 and 18 volts. http://onsemi.com 5 TND308 V 11 8 10 9 AC Comp FB/SD NCP1651 V 12 0.1 F Vref 13 VCC 16 Startup RLOAD Ref Fltr AC Input GND 2 VCC 1 F 1 Output 5 IS+ Iavg Iavg fltr 7 6 Ramp CT Comp 3 4 470 pF 47 k Figure 18. Vref versus VCC in Shutdown Mode Re: NCP1651/D data sheet, Figure 24 Connect desired load to pin 12. Apply 14 volts to VCC pin, unit will be in shutdown mode. Measure Vref voltage. http://onsemi.com 6 TND308 Notes http://onsemi.com 7 TND308 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. 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