07/16/2013 Test Procedure for the NCV887601BSTGEVB Operational Guidelines The demo board is rated to operate full load (3.6 A) for an input voltage as low as 2.6 V at the input terminal under full power. To prevent negative impedance oscillation between the power source and the demo board, connect large value electrolytic capacitors (e.g. 220 µF + 470 µF) at the PCB VIN/GND terminals to decouple the power source from the boost demo board. Notes: 1- Limit time spent with the power supply operating at minimum input voltage (PCB VIN = 2.6 V) to avoid overheating the power semiconductors. 2- The use of external electrolytic capacitors at the input of the demo board (short leads) is strongly recommended for bench testing. Test Procedure: 1. Connect a DC source voltage (15 A capable) set to a voltage of 8.5-9.0 V as shown in Fig. 1. 2. Connect a 3.6 A load on the output. 3. Decrease the DC input voltage until the PCB VIN voltage is less than that that of the output. Verify that the unit is regulating at VOUT = 6.8 V. 4. Reduce the DC input voltage until the PCB VIN = 2.6 V. Verify that the unit is regulating at VOUT = 6.8 V. VIN DC Source (15 A capable) VOUT 470 µF + 220 µF Aluminum Electrolytics (LOCATE NEAR PCB, USE SHORT LEADS) GND Figure 1. Demo Board Connections NCV887601 6.8 V / 3.6 A GND Demo Board