Test Procedure for the LV52204MUGEVB Evaluation Board 1. Evaluation Board Spec Evaluation Board Spec Input Voltage FB voltage 0～200mV 2.7～5.5V voltage Over Voltage Protection 38V Oscillation Frequency 600kHz 2. Evaluation Board Schematic L1 22uH TP1 VBAT C1 1uF C2 1uF TP11 LEDO 4 5 SW GND VLS3012E-220M ( TDK) MBR0540T1 ( ON semi ) GRM188R61A105K (Murata) GRM21BR71H105K (Murata) 220nF 10Ω 3 2 FB R1 10Ω L1: D1: C1: C2: C3: R1: FCAP VIN SWIRE 6 TP4 SWIRE 1 TP8 FB D1 TP10 GND C3 220nF 3. Pin Function PIN # Pin Name Description 1 FB Feedback pin. 2 FCAP Filtering capacitor terminal for PWM mode. 3 GND Ground 4 SW Switch pin. Drain of the internal power FET. 5 SWIRE 1-wire dimming control and PWM dimming input(active High). 6 VCC Supply voltage. Expose-pad Connect to GND on PCB. 3/19/2014 1 www.onsemi.com 4. Start/Shutdown sequences 1. Please input "High" into SWIRE PIN during the period that is longer than Ton(20uSec) to start IC. 2. Then, please select a mode during mode select period(Tsel) .When you select Digital Mode, please input "Low" longer than Tw1 after "High" longer than Tw0(100uSec) within Tsel(1mSec) period. It becomes PWM mode if you fail to set Digital mode in specified timing period. In the case of PWM frequency is less than 6.6kHz, it may become Digital Mode when you input a narrow pulse of Duty.To evade it, input "High" that is longer than Tsel(2.2mSec), and, please input PWM pulse afterwards. 3. IC shut down when you make SWIRE PIN Low longer than Toff(8.9ms) period. The Data register is stored at this point. The reset of the power supply is necessary to clear it. In addition, the mode is initialized when you shut down IC.Please make mode select each time you reboot. Tdel Digital Mode Tsel ・・・ SWIRE ・・・ ・・・ Tw1 Toff Shutdown Shutdown Device Address & data Tw0 Device Address & data Digital Mode PWM Mode Tsel Tdel Ton ・・・ ・・・ Toff SWIRE (PWM Freq > 6.6kHz) Shutdown PWM Enable Tsel Tdel ・・・ ・・・ SWIRE (PWM Freq < 6.6kHz) Toff Shutdown PWM Enable Start Up Shut down SWIRE [5v/div] SWIRE [5v/div] SW [10v/div] SW [10v/div] FB [200mV/div] FB [200mV/div] IL [200mA/div] 3/19/2014 IL [200mA/div] 2 www.onsemi.com