NCP1400A Demo Board Test Procedure Demo Board +Vs Power Supply w/ 4 wires sensing L +V -V IOUT Electronic Load TP2 TP1 IIN VIN V VOUT IOUT = 10 mA TP4 V mA -VS TP3 OFF ON Oscilloscope Setting Oscilloscope Ch1 Ch1: 1 V/div (DC-coupled) Ch2: 20 mV/div (AC-coupled) Time base: 2 µs/div Ch2 1. Connect the test setup as shown above. 2. Apply an input voltage, VIN = 1.5 V across TP1 and TP4. 3. Set the electronic load to 10 mA. 4. Check IIN, VOUT, and output Vripple; Device Voltage IIN (V); Min / Max Range VOUT ; Min / Max Range Option 1.9 V 15.4 mA to 16.3 mA 1.853 V to 1.948 V 2.5 V 20.3 mA to 21.4 mA 2.438 V to 2.563 V 2.7 V 21.9 mA to 23.1 mA 2.633 V to 2.768 V 3.0 V 24.4 mA to 25.7 mA 2.925 V to 3.075 V 3.3 V 26.8 mA to 28.2 mA 3.218 V to 3.383 V 5.0 V 40.6 mA to 42.8 mA 4.875 V to 5.125 V 5. VRIPPLE ; Typical 11 mVP-P 12 mVP-P 13 mVP-P 15 mVP-P 16 mVP-P 17 mVP-P Check the switching waveform at scope Ch1 to see whether it is a normal discontinuous conduction mode switching node voltage waveform. And check the frequency of the waveform, FSW, it should be 144 kHz to 216 kHz. Page 1 ON Semiconductor Dale Joersz Oct. 15, 2004 Rev.2