Test Procedure for the NCP1421 h 01/01/2004 Oscilloscope Adjust Setting Agilent E3632A Ch1 : 20mV/div Ch2 : 2V/div Time base : 1 uS/div 3.000V 0.0000A CHANNEL 1 +S + - 2 3 -S KIKUSUI PLZ153W IOUT = 1mA ~ 500mA POWER 34401A Agilent MULTIMETER 3.3V 5.0V VOUT = DCV ACV OHM < > w FREQ LO ON OFF LO < > 4 Test Procedure: 1. 2. 3. 4. 5. Connect the test setup as shown above. Turn OFF the JP1; (Enable the device). Set the Power Supply to 3.0V and apply to TP1, TP2 (T1, T2). Apply 500mA loading from the electronic load. Check the input current (IIN ), output voltage (VOUT) and output ripple; • For VOUT = 3.3V; JP2 OFF IIN = 590.7mA ~ 608.7mA VOUT = 3.267 ~ 3.367V VRIPPLE ≤ 35mV • For VOUT = 5V; JP2 ON IIN = 931.07mA ~ 957.4mA VOUT = 4.859 ~ 5.0075V VRIPPLE ≤ 40mV 6. Check the switching waveform at scope CH1 to see whether it is a normal continuous conduction mode switching node waveform and switching ON time (TON ) is between 0.46µs ~ 1.15µs.