Test Procedure for the NCP1612GEVB Evaluation Board Oscilloscope Isolated current probe High voltage, voltage probe (500 V) Isolated ac power source ALT1 NCP1611 demo-board Ground terminal of the probe ALT2 (200-W, 60-Hz sinusoidal voltage) + VBULK Electronic Load GND V (500 V, 0.5 A) A Power Analyser (e.g., PM1200) Figure 1 – Set-up for board testing 1. Equipments for measurement. The board testing set-up is shown in Figure 1: Apply an electronic load across the output (between the VBULK” and “GND” terminals of the board). This equipment will adjust the current ILOAD that loads the demo-board. Place a power analyzer able to measure the power factor (“PF”) and the Total Harmonic Distortion (“THD”) of the current absorbed from the ac power source. Apply a 200-W or more, 60-Hz, isolated ac power source between the “ALT1” and “ALT2” inputs of the demo-board. This source will adjust the sinusoidal input voltage, Vin, that is applied to the demo-board. The rms value of Vin must stay below 265 V. 2. Measurements 3/2/2012 -1- www.onsemi.com VBULK, PF and THD measurements: Parameters Comments Vin,rms=115 V, ILOAD=0.1 A Voltage measured between “VBULK ” and VBULK “GND” PF Power Factor THD Total Harmonic Distortion Vin,rms=115 V, ILOAD=0.4 A Voltage measured between “VBULK ” and VBULK “GND” PF Power Factor THD Total Harmonic Distortion Vin,rms=230 V, ILOAD=0.4 A Voltage measured between “VBULK ” and VBULK “GND” PF Power Factor THD Total Harmonic Distortion Limits 380 V < VBULK < 400 V > 0.950 < 15 % 380 V < VBULK < 400 V > 0.990 < 15 % 380 V < VBULK < 400 V > 0.950 < 20 % Brown-out levels: An external 12-V VCC is applied. The load current being 0.1 A, set the input voltage to 82 Vrms and decrease the input voltage with 1-V steps of 1 s or more. The demo-board must still operate at 75 Vrms and turn off before reaching 70 Vrms. The input voltage is increased from 70 Vrms with 1-V steps of 1 s or more, the PFC stage must stay off at 75 Vrms and recover operation at a voltage lower than 82 Vrms. Skip. Observe the MOSFET drain-source voltage at 230 V / 50 Hz, 0.04-A load. There must be skip periods of time the duration of which must be between 2 and 7 ms (see Figure 2). 3/2/2012 -2- www.onsemi.com Skipping interval Figure 2 – MOSFET drain-source voltage (Vin,rms = 230 V, ILOAD = 0.04 A) 3/2/2012 -3- www.onsemi.com