Test Procedure for the NCV47551DAJGEVB Evaluation Board 1. Connect the test setup as is shown in Figure 1. See Table 1 with required equipment. - Letter F – Force line - Letter S – Sense line 2. Select output current limit by connecting jumper J0 – J3. - J0 – ILIM0 ~ 100 µA - J1 – ILIM1 ~ 10 mA - J2 – ILIM2 ~ 20 mA - J3 – ILIM3 – RCSO3 position available for individual current limit setting by resistor from range 127.5 Ω to 25.5 kΩ 3. Set Input Voltage and turn on Power Supply. 4. Enable chip by connecting external Voltage Source on appropriate EN jumper. Enable voltage must be higher than 2.31 V. 5. Set load current (max 20 mA) and turn ON Load. 6. Monitor Output voltage, it’s given according to Equation 1. (eq. 1) 7. Monitor CSO voltage on appropriate CSO connector. It should be max 2.55 V in steady state. The CSO voltage is proportional to output current according to Equation 2. (eq. 2) 8. Compare your results with measured results in Table 2. 2/7/2014 1 www.onsemi.com Power Supply Load A - meter V - meter Voltage Source V - meter Figure 1. Test Setup Table 1: Required Equipment Equipment Power Supply Voltage Source Load V - meter A - meter 2/7/2014 Ranges 0 V – 45 V / 100 mA 0 V – 45 V 0 mA – 100 mA 0 V – 20 V 0 mA – 100 mA 2 www.onsemi.com Figure 2. PCB Layout Table 2: Measured Results Value Parameter Test Conditions Nominal Measured Output Voltage Vin = 13.5 V, Vout_nom = 5.1 V, Iout = 0.1 mA, RCSO = Short to ground 5.1 5.11 Vin = 13.5 V, Vout_nom = 5.1 V, Iout = 20 mA, RCSO = Short to ground 5.1 5.12 Vin = 13.5 V, Vout_nom = 5.1 V, Vout = 0 V, RCSO = 24.9 kΩ 0.102 0.11 Vin = 13.5 V, Vout_nom = 5.1 V, Vout = 0 V, RCSO = 249 Ω 10.2 10.6 Vin = 13.5 V, Vout_nom = 5.1 V, Vout = 0 V, RCSO = 127 Ω 20 20.8 Iout = 1 mA, R1 = 82 kΩ, R2 = 27 kΩ, Cin = none, Cb = 10 nF, Cnoise = 10 nF, f = 100 Hz, 0.5 Vp-p 80 86.4 Iout = 1 mA, R1 = 82 kΩ, R2 = 27 kΩ, Cin = none, Cb = 10 nF, Cnoise = 10 nF, f = 1 kHz, 0.5 Vp-p 70 Output Current PSRR 2/7/2014 Unit V mA dB 3 89 www.onsemi.com