Test Procedure for the NCP1529ASNT1G Evaluation Board Equipment needed • • • Power supply Digital Volt Meter Digital Amp Meter Test 1) Jumper ENABLE (and SELECT for the UDFN6 package) should be open. 2) Set the power supply to 3.6 V and the current limit of at least 1.5A. 3) Connect Vin+ to power supply and Vin- to ground. The DC current measurement on Vin+ line should be around 0.3 µA. 4) For the UDFN6 package, close the SELECT connector to the potentiometer. 5) Close EN connector. 6) Modify P2 potentiometer to get Vout to 1.2V. Output voltage value is defined by : Vout = 0.6 x (1 + R1/R2) 7) The DC current measurement on Vin+ line should be around 36 µA. The part operates in PFM mode: Vlx Vout = 1.2V Figure 1: Vlx and Vout in PFM mode 5/30/2008 -1- www.onsemi.com 8) Increase Output current to 1A. The part works in PWM mode with a low ripple: Vlx Vout = 1.2V Figure 2: Vlx and Vout in PWM mode 9) Remove J5 connector. The DC current measurement on Vp line should be back around 0.3 µA. 5/30/2008 -2- www.onsemi.com