Test Procedure for the NCP8675 Evaluation Board 7/18/2007 Required Equipment: -Resistive Load -2 Multimeters -One NCV8675 Demo Board -DC Power Supply NCV8675 Demo Board I Cin + DC Voltmeter Vin Vout NCV8675 Reset Delay O DC Power Supply Cout Cdelay Load + - DC Voltmeter Vout G Figure 1- Dropout Voltage Test Setup Dropout Voltage Verification Steps 1. Connect circuit as shown in Figure 1. 2. Set Vin= 13.5 V, Record Vout. 3. Reduce Vin until Vout has dropped by 100mV. 4. Subtract Vout from Vin. Resulting Voltage is Dropout Voltage. NCV8675 Dropout Voltage vs. Load Current 0.45 0.4 0.35 Dropout Voltage (V) O 0.3 0.25 0.2 0.15 0.1 0.05 0 0 100 200 Load Current (m A) 300 DC Ammeter + DC Ammeter - + - NCV8675 Demo Board DC Power Supply Vin I Reset Cin Vout NCV8675 Delay Cdelay Vout Figure 2. Quiescent Current Verification Setup Quiescent Current Verification Steps 1. Connect circuit as shown in Figure 2. 2. Set Vin= 13.5 V. 3. Subtract Output Current from Input Current. NCV8675 Quiescent Current vs. Load Current 25 Quiescent Current (mA) 20 15 10 5 0 0 100 200 Load Current (m A) 300 O Cout Load NCV8675 Demo Board Vin I Reset Cin Vout NCV8675 O DC Power Supply Delay O Cout Cdelay + DC Voltmeter Load DC Voltmeter Vout G Figure 3. Output Voltage Verification Setup Output Voltage Verification Steps 1. Connect circuit as shown in Figure 3. 2. Set output load to 100 Ohms, Set Vin= 0 V, Record Vout. 3. Increase Vin, measure Vout. NCV8675 Vin Vs. Vout 6 Output Voltage (V) 5 4 3 2 1 Load = 100 Ω 0 0 + - 10 20 30 Input Voltage (V) 40 Oscilloscope Ch 1 Ch 2 NCV8675 Demo Board Vin I Cin NCV8675 Reset Vout Delay Cdelay Vout G Figure 4: Reset Delay Verification Setup Reset Delay Verification Steps 1. Connect circuit as shown in Figure 4. 2. Set Vin= 0 V. 3. Increase Vin from 0 V to 14 V. Reset Delay Time Delay O DC Power Supply Cout Load