TND307 Graphical Data Test Circuits for the NCP1650 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 NCP1650/D data sheet. Each graph has a schematic associated with it and in some cases a description of the procedure. 0–5 V 0.1 F 47 k 14 V 2 0.1 F Vref 16 Output 12 IS– 30 k 1 F 300 0.05 F 0 to –5 V Iavg Iavg fltr 10 11 0–5 V 1 nF Ramp GND CT Comp 15 k 15 14 13 10 k 470 pF 47 k 0–5 V 10 1k 1 Vin 3 AC Comp 4 Ref Filter 5 AC Input 6 FB/SD 7 Loop Comp 8 Pcomp 9 Pmax NCP1650 0.5 F 1 Vin 3 AC Comp 4 Ref Filter 5 AC Input 6 FB/SD 7 Loop Comp 8 Pcomp 9 Pmax NCP1650 30 k APPLICATION NOTE 2 0.1 F Vref 14 V 1 F 16 Output 12 IS– Iavg Iavg fltr 10 11 Ramp GND CT Comp 15 14 13 10 k 470 pF 47 k Figure 2. Reference Multiplier Family of Curves Re: NCP1650/D data sheet, Figure 4 Figure 1. Power Multiplier Family of Curves Re: NCP1650/D data sheet, Figure 3 Power up chip. Set IS– between 0 and –200 mV in 50 mV increments. For each value of IS– set the ac input (pin 5) to various values from 0 to 3.8 volts. Record output Pmax (pin 9). Semiconductor Components Industries, LLC, 2002 March, 2002 – Rev.0 1 Publication Order Number: TND307/D TND307 3.3 k GND 15 10 k 2 0.1 F Vref 14 V 30 k 1 F Iavg Iavg fltr 10 11 3.3 k Ramp CT Comp 14 13 47 k CT GND 15 10 k Freq Cntr Bias device per the above figure. Install various values of CT, and measure the frequency at pin 13. Do not measure directly from pin 14, as the impedance of the measuring device will cause errors in the reading. 4 5 6 2.5 V 3.3 k NCP1650 3 7 8 Pcomp 9 Pmax GND 15 2 0.1 F Vref Iavg fltr Iavg fltr 10 11 Ramp CT Comp 14 13 47 k CT Freq Cntr Bias device per the above figure. Install various values of CT, and measure the frequency at pin 13. Measure amplitude at pin 14 with an oscilloscope. 14 V 30 k 1 F 16 Output 12 IS– Iavg Iavg Figure 4. Ramp Peak versus Frequency Re: NCP1650/D data sheet, Figure 6 Figure 3. Frequency versus CT Re: NCP1650/D data sheet, Figure 5 1 Vin AC Comp Ref Filter AC Input FB/SD Loop Comp 1 F 16 Output 12 IS– NCP1650 16 Output 12 IS– 14 V 2 0.1 F Vref 1 Vin 3 AC Comp 4 Ref Filter 5 AC Input 6 FB/SD 7 Loop Comp 8 Pcomp 9 Pmax 0–5 V 10 11 3.3 k Ramp CT Comp 14 13 47 k CT 10 k 1 Vin 3 AC Comp 4 Ref Filter 5 AC Input 6 FB/SD 7 Loop Comp 8 Pcomp 9 Pmax NCP1650 1 Vin 3 AC Comp 4 Ref Filter 5 AC Input 6 FB/SD 7 Loop Comp 8 Pcomp 9 Pmax NCP1650 30 k GND 15 470 pF 2 0.1 F Vref 16 Output 12 IS– Iavg Iavg fltr 14 V 1 F CL 10 11 Ramp CT Comp 14 13 47 k Figure 6. Drive Rise and Fall Time versus Capacitance Re: NCP1650/D data sheet, Figure 8 Figure 5. Max Duty Cycle versus Frequency Re: NCP1650/D data sheet, Figure 7 Measure frequency and duty cycle for various values of CT. Adjust the voltage on pin 3 for approximately 50% duty cycle from the output driver. Measure the waveform on pin 16 with an oscilloscope and measure the rise and fall times at the 10% and 90% levels. Change CL as required. http://onsemi.com 2 TND307 0.05 F 0.1 F 47 k 1 F Vref NCP1650 Vin 3 AC Comp 4 Ref Filter 5 AC Input 6 FB/SD 7 Loop Comp 8 Pcomp 9 Pmax 16 Output 12 IS– Iavg Iavg fltr 1.5 V 300 0 to –5 V 10 11 1 nF Ramp GND CT Comp 15 14 13 10 k 470 pF 10 k 0.1 F 14 V 2 0.1 F 1 2 Vref 14 V 1 F 650 16 Output 12 IS– 10 Iavg 11 Iavg fltr Ramp CT Comp 14 13 GND 15 3.3 k 10 15 k 1 Vin 3 AC Comp 4 Ref Filter 5 AC Input 6 FB/SD 7 Loop Comp 8 Pcomp 9 Pmax NCP1650 30 k 470 pF 47 k Figure 8. Vref, Transient Response Re: NCP1650/D data sheet, Figure 11 Figure 7. Current Sense Amplifier Gain Re: NCP1650/D data sheet, Figure 9 Adjust voltage at pin 12, and read values at pins 10 & 11. 0–5 V V V 1k 1.5 V Pmax 6 FB/SD 5 AC Input 7 Loop Comp 3 AC Comp 4 Ref Filter 8 Pcomp 14 V 1 F 16 Output 12 IS– 0–5 V 1k 1.5 V Iavg fltr 470 pF 3.3 k 47 k 33 k 10 k GND 15 2 0.1 F Vref Iavg fltr 14 V 30 k 1 F 10 11 Ramp CT Comp 14 13 47 k CT 14 V 1 F 16 Output 12 IS– 10 11 Iavg Iavg fltr 470 pF 47 k Figure 10. Power Error Amplifier Gain Re: NCP1650/D data sheet, Figures 14 & 15 16 Output 12 IS– Iavg 2 0.1 F Vref Ramp CT Comp 14 13 1 Vin 3 AC Comp 4 Ref Filter 5 AC Input 6 FB/SD 7 Loop Comp 8 Pcomp 9 Pmax NCP1650 NCP1650 1 Vin 3 AC Comp 4 Ref Filter 5 AC Input 6 FB/SD 7 Loop Comp 8 Pcomp 9 Pmax 1 Vin 6 FB/SD 9 Pmax 5 AC Input 8 Pcomp 3 AC Comp 4 Ref Filter 7 Loop Comp GND 15 Figure 9. Voltage Error Amplifier Gain Re: NCP1650/D data sheet, Figures 12 & 13 30 k V V 10 Iavg 11 Ramp CT Comp 14 13 GND 15 3.3 k 2 0.1 F Vref NCP1650 9 NCP1650 1 Vin 3.3 k 10 k Freq Cntr Figure 11. Frequency versus CT Re: NCP1650/D data sheet, Figure 16 GND 15 2 0.1 F Vref 14 V 1 F 16 Output 12 IS– Iavg Iavg fltr 10 11 Ramp CT Comp 14 13 470 pF Figure 12. Ramp Peak versus Temperature Re: NCP1650/D data sheet, Figure 17 http://onsemi.com 3 TND307 0–15 V 4 5 6 NCP1650 3 1 Vin AC Comp Ref Filter AC Input FB/SD Loop Comp 7 8 Pcomp 9 Pmax 1.5 V GND 15 3.3 k 2 0.1 F Vref 1 F 16 Output 12 IS– 10 11 Iavg Iavg fltr Ramp CT Comp 14 13 47 k CT Figure 13. UVLO Turn On/Turn Off Re: NCP1650/D data sheet, Figure 18 10 mA 5 mA 2 mA 3.25 k 3 4 5 6 1.5 V 3.3 k 1 Vin AC Comp Ref Filter AC Input FB/SD Loop Comp NCP1650 0 mA 0.65 k 1.30 k 14 V A 7 8 Pcomp 9 Pmax GND 15 2 Vref 0.1 F 16 Output 12 IS– Iavg Iavg fltr V 10 11 Ramp CT Comp 14 13 47 k CT Figure 14. Vref Line/Load Regulation in Operating Mode Re: NCP1650/D data sheet, Figures 19 & 20 http://onsemi.com 4 1 F V TND307 0–5 V V V 1k 1.5 V Pmax 6 FB/SD 5 AC Input 7 Loop Comp 3 AC Comp 4 Ref Filter 8 Pcomp 16 Output 12 IS– 0–5 V 1k 1.5 V Iavg fltr 470 pF 3.3 k 47 k 1.5 V 3.3 k 7 8 Pcomp 9 Pmax GND 15 2 0.1 F Vref 16 Output 12 IS– Iavg Iavg fltr 16 Output 12 IS– Iavg Iavg fltr 10 11 Ramp CT Comp 14 13 470 pF 47 k Energize unit by applying 14 volt supply. Using a precision supply with resolution of 1 mV or less, adjust the voltage at pin 9 for zero current out of pin 8. The voltage at pin 9 will be the effective 2.5 V reference voltage. V VCC V 1 Vin 3 AC Comp 4 Ref Filter 5 AC Input 6 FB/SD 7 Loop Comp 8 Pcomp 9 Pmax 1 F NCP1650 4 5 6 NCP1650 3 1 Vin AC Comp Ref Filter AC Input FB/SD Loop Comp 14 V 1 F 2 0.1 F Vref Figure 16. Power Error Amplifier Gain Re: NCP1650/D data sheet, Figure 22 Energize unit by applying 14 volt supply. Using a precision supply with resolution of 1 mV or less, adjust the voltage at pin 6 for zero current out of pin 7. The voltage at pin 6 will be the effective 4.0 V reference voltage. A 1 Vin 6 FB/SD 9 Pmax 5 AC Input 8 Pcomp 3 AC Comp 4 Ref Filter 7 Loop Comp GND 15 Figure 15. Voltage Error Amplifier Gain Re: NCP1650/D data sheet, Figure 21 V V V 10 Iavg 11 Ramp CT Comp 14 13 GND 15 3.3 k 14 V 1 F 2 0.1 F Vref NCP1650 9 NCP1650 1 Vin 1 nF 10 11 Ramp CT Comp 14 13 47 k CT 3.3 k Figure 17. Bias Current versus VCC Re: NCP1650/D data sheet, Figure 23 GND 15 2 0.1 F Vref 14 V 1 F 16 Output 12 IS– Iavg Iavg fltr 10 11 Ramp CT Comp 14 13 47 k CT Figure 18. Vref versus VCC in Shutdown Mode Re: NCP1650/D data sheet, Figure 24 http://onsemi.com 5 TND307 NCP1650 1 Vin 3 AC Comp 4 Ref Filter 5 AC Input 6 FB/SD 7 Loop Comp 8 Pcomp 9 Pmax 1.5 V 3.3 k GND 15 2 0.1 F Vref 14 V 1 F 16 Output 12 IS– Iavg Iavg fltr 10 11 Ramp CT Comp 14 13 47 k CT Figure 19. Minimum Duty Cycle versus Frequency Re: NCP1650/D data sheet, Figure 25 Apply power to 14 V supply and then to 1.5 V supply. Measure on time, and period at pin 16 using an oscilloscope. Vary capacitor value from 2000 pF to 100 pF for frequency range of 25 kHz to 300 kHz. http://onsemi.com 6 TND307 Notes http://onsemi.com 7 TND307 ON Semiconductor and are 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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