Test Procedure for the NCP1406V15GEVB Evaluation Board 10/27/2004 15V Output Version Test Procedure 1. Connect a power supply with 4-wire sensing across TP1 and TP2, i.e. VIN. 2. Connect an electronic load across TP3 and TP4, i.e. VOUT. 3. Connect a multi-meter across TP3 and TP4 to monitor the output voltage. 4. Set the JP1 to the “ON” position. 5. Set the power supply voltage to 5V. 6. Set the electronic load to 50 mA. 7. Check VOUT, IIN, and output Vripple: VOUT = 14.4 V to 15.6 V, IIN = 160 mA to 185 mA, Vripple ~ 40 mVpp. 7. Check the switching waveform at scope to see whether it is a normal discontinuous conduction mode switching node voltage waveform. See Figures 1 and 2 for examples. 8. Set the JP1 to the “OFF” position. Check that there is no switching at the switching node and the VOUT is equal to VIN minus a Schottky diode forward voltage. 9. Set the JP1 back to the “ON” position and check that the VOUT is normal as before. Figure 1. Low Load Switching Waveforms Example Figure 2. High Load Switching Waveforms Example