Test Procedure for the NCV47411PAAJGEVB Evaluation Board The NCV47411 is dual channel adjustable Low Dropout Regulator with: - Two adjustable output voltages from 3.3 V to 20 V - Two adjustable current limits up to 150 mA - Enable inputs with 3.3 V Logic compatible thresholds Power supplying of the chip is possible from one or two independent sources. INPUT1 must be always supplied and INPUT2 as optional for Vin2 supply. 1. Power supplying a. Power supplying from one source Connect the test setup as is shown in Figure 1 (See Table 1 with required equipment). Connect power supply to INPUT1 connector J1 (Power supplying of INPUT2 is not needed). - Hi_F – Positive Force line - Hi_S – Positive Sense line - Lo_F – Negative Force line - Lo_S – Negative Sense line Connect Vin2 pin to INPUT1 via appropriate position of jumper “Vin2 to IN1 or IN2 connection”. b. Power supplying from two sources Connect the test setup as is shown in Figure 1 (See Table 1 with required equipment). Connect two power supplies to INPUT1 connector J1 and to INPUT2 connector J2, respectively. - Hi_F – Positive Force line - Hi_S – Positive Sense line - Lo_F – Negative Force line - Lo_S – Negative Sense line Values of input voltages Vin1 and Vin2 can be different. This option is suitable for reducing of power dissipation on chip. Connect Vin2 pin to INPUT2 via appropriate position of jumper “Vin2 to IN1 or IN2 connection”. 2. Connect jumpers J10 – J13 for output current limitation from Vout1 pin and J20 – J23 for output current limitation from Vout2 pin. - Jn0 – ILIMn0 ~ 10 mA - Jn1 – ILIMn1 ~ 50 mA - Jn2 – ILIMn2 ~ 100 mA - Jn3 – ILIMn3 – RCSOn3 positions available for individual current limit setting by resistor from range 850 Ω to 12.75 kΩ 3. Set Input Voltage and turn on Power Supply/Supplies. 4. Enable output of the channel to power the regulated output voltage by connecting the ENABLE pin to corresponding Vin via jumper. Enabling can be performed by external voltage source as well. 5. Load the outputs by resistive loads connected via jumpers: - J5, J7 – 51 Ω - J6, J8 – 1 kΩ External loads can be used instead build-in resistive loads as well. 10/18/2012 www.onsemi.com 1 6. Monitor Output Voltages, given according to Equation 1. (eq. 1) 7. Monitor Current Sense Output voltages on appropriate connector. They should be max 2.55 V in steady state. The CSO voltages are proportional to output currents according to Equation 2. (eq. 2) 8. Compare your results with measured results in Table 2. V - meter A - meter Power Supply Power Supply A - meter Load Load V - meter V - meter V - meter Figure 1. General Test Setup Table 1: Required Equipment Equipment Power Supply Load V - meter A - meter Ranges 0 V – 45 V / 1 A 0 mA – 500 mA 0 V – 20 V 0 mA – 500 mA 10/18/2012 www.onsemi.com 2 Figure 2. Top side PCB Layout (3 x 3 inch) 10/18/2012 www.onsemi.com 3 Table 2: Measured Results Value Parameter Test Conditions Symbol Vin = 13.5 V, Vout_nom_n = 5.02 V, I out_n = 5 mA, RCSO_n = Short to ground Output Voltage Vin = 13.5 V, Vout_nom_n = 5.02 V, I out_n = 100 mA, RCSO_n = Short to ground Vin = 13.5 V, Vout_nom_n = 5.02 V, Vout_n = 90 % of Vout_nom_n, RCSO_n = 12.7 kΩ Output Current Vin = 13.5 V, Vout_nom_n = 5.02 V, Vout_n = 90 % of Vout_nom_n, RCSO_n = 2.49 kΩ Vin = 13.5 V, Vout_nom_n = 5.02 V, Vout_n = 90 % of Vout_nom_n, RCSO_n = 1.2 kΩ Vin = 13.5 V, Vout_nom_n = 5.02 V, Vout_n = 0 V, RCSO_n = 12.7 kΩ Output Current Vin = 13.5 V, Vout_nom_n = 5.02 V, Vout_n = 0 V, RCSO_n = 2.49 kΩ Vin = 13.5 V, Vout_nom_n = 5.02 V, Vout_n = 0 V, RCSO_n = 1.2 kΩ 10/18/2012 Nominal Vout1 Vout2 Vout1 Iout2 Iout1 Iout2 Iout1 Iout2 Iout1 Iout2 Iout1 Iout2 Iout1 Iout2 5.02 5.005 5.005 V 5.005 10.04 51.2 106.25 10.04 51.2 106.25 10.06 10 52.47 52.19 110.28 109.95 10.55 10.49 54.44 54.17 115.32 114.37 www.onsemi.com 4 Unit 5.006 Vout2 Iout1 Measured mA mA