Test Procedure for the NCV8873LEDBSTGEVB Evaluation Board Operational Guidelines 1. Connect a DC input voltage, within the 6 V to 40 V range, between VIN and GND. 2. Connect a DC enable voltage, within the 2.0 V to 5.0 V range, between EN/SYNC and GND. 3. Connect a function generator between PWM and GND. It is recommended the waveform be set to a. 125-200 Hz square typical frequency range, b. low state voltage of 0 – 0.8V c. high state of 1.8-5V range d. duty cycle from 0.1% to 100% 4. Overvoltage may be tested by enabling the board (EN/SYNC) with jumper J1 removed. 5. Optionally, a. for external clock synchronization, connect a pulse source between EN/SYNC and GND. The high state level should be within the 1.8 to 5 V range*, and the low state level within the -0.3 V to 0.8 V range, with a minimum pulse width of 40 ns and a frequency within the 1 MHz and 1.1 MHz range. b. Jumper J1 should be removed if an external load is to be used instead of on-board LEDs. Input voltage operating range is valid for loads requiring Vout < 40 V. Optional load (must remove J1) Vin Venable PWM Dimming Figure 1. Demo Board Connections 5/07/2013 1 www.onsemi.com Typical Performance Start-up VOUT EN Figure 2 Typical start-up with VIN = 12 V, 10 LEDs/60mA 5/07/2013 2 www.onsemi.com