1/24/2014 1 www.onsemi.com
Test Procedure for the NCP383LMUAJAGEVB Evaluation Board
This test procedure is given as an example for 800mA OCP version and EN active high.
Equipments needed:
Power supply 5V, 3A.
1 potentiometer 100Ω, 10W.
1 oscilloscope with 3 voltage probe and 1 current probe.
Set-up
VCC = 5V
VIN=3.3V
Device disable, EN=5V with ENABLE H/ENABLE L switch.
Connect R3, R4 to VCC (Flag pull-up) with FLAG1&FLAG2 PULL UP jumper.
Connect potentiometer between OUT1 or OUT2 and GND pin.
Turn-on sequence
Enable device, EN=0V with ENABLE H/ENABLE L switch.
Over current protection
Sense IN (Yellow), OUT (Blue), FLAG (Green) voltage and IOUT (Purple).
Enable device, EN=5V with ENABLE H/ENABLE L switch.
Decrease resistance value of the potentiometer until FLAG goes to 0V.
Regulation mode
Sense IN (Yellow), OUT (Blue), FLAG (Green) voltage and IOUT (Purple).
Enable device, EN=5V with ENABLE H/ENABLE L switch.
Decrease resistance value of the potentiometer until regulation mode occurs.
Turn off
Disable device, EN1&2=5V with ENABLE H/ENABLE L switch.
Remove Vin voltage
Remove Vcc voltage
