Enpirion Power Evaluation Board User Guide EN2360QI PowerSoC Enpirion EN2360QI DC-DC Converter w/Integrated Inductor Evaluation Board Introduction Thank you for choosing Altera Enpirion power products This evaluation board user guide applies to the EN2360 devices mounted on PCBs with the part number 06978 rev A, and three components on the backside. In addition to this document, you will also need the latest device datasheet. The EN2360QI features integrated inductor, power MOSFETS, controller, a bulk of the compensation network, and protection circuitry against system faults. This level of integration delivers a substantial reduction in footprint and parts count over competing solutions. The evaluation board is optimized for engineering ease of testing through programming options, clip leads, test points etc. The EN2360QI features a customer programmable output voltage by means of a resistor divider. The resistor divider allows the user to set the output voltage to any value within the range 0.6V to 3.3V. The evaluation board, as shipped is populated with a 4 resistor divider option. The upper resistor is fixed and has a phase lead capacitor in parallel. One of the 4 lower resistors is selected with the jumper option for different output voltages. To change V , retain the upper OUT resistor and capacitor and change only the lower resistor. The input and output capacitors are X5R or X7R multi-layer ceramic chip capacitors. The Soft-start capacitor is a small value X7R MLCC. Pads are available to have multiple input and output capacitors. This allows for evaluation of performance over a wide range of input/output capacitor combinations. Clip-on terminals are provided for ENA and POK. Banana jacks are provided for 12V , AVIN, and V terminals. Several signal and GND clip-on test points are IN OUT also provided to measure V , V , and GND nodes. IN OUT The Enable pin is pre-wired with a resistor divider to PVIN and GND according to the datasheet recommendation. Enable may also be controlled by applying an external signal to the ENA clip-on terminal. Page 1 of 10 www.altera.com/enpirion Enpirion Power Evaluation Board User Guide EN2360QI PowerSoC Foot print is also provided for a SMA connector to S IN input. A switching input to this pin allows the device clock to be phase locked to an external signal. This external clock synchronization allows for moving any offending beat frequency to be moved out-of-band. A swept frequency applied to this pin results in spread spectrum operation and reduces the peaks in the noise spectrum of emitted EMI. A two pin header footprint is provided for the S OUT pin. This signal can be used to synchronize another EN2360 to the switching frequency coming out of the S OUT pin. The board comes with input decoupling and PVIN (12VIN) reverse polarity protection to guard the device against common setup mishaps. Please note there is no reverse polarity protection on AVIN input. Quick Start Guide STEP 1: This board has some additional components on the back side including a resistor divider from PVIN to Enable to GND (indicated as NR1 & NR2 in the schematic). As a result of these components, there is no need for a jumper on J3 (see Figure 1), and the component FB1 (to the left of AVIN test point TP28) should not be populated. Please contact Altera Power Applications support if your board does not have these components added on the back side, or if FB1 is still populated. Figure 1: Enable header without any jumpers STEP 2: Connect the 12V nominal Power Supply to the input power connectors, 12VIN (J7) and GND (J11) as indicated in Figure 4 and set the supply to the desired voltage. CAUTION: Be mindful of the polarity. Even though the evaluation board comes with reverse polarity protection diodes, it may not protect the device under all conditions. STEP 3: Make sure the two-in header J1 is properly populated depending on how you want to power AVIN. If you want to use the device in a single input supply mode, and use the on-chip AVINO pin, then populate J1 with a shorting jumper. If you want to supply your own external AVIN, then remove the jumper from J1, and connect a 3.3V nominal power supply to the AVIN (J9) and GND (J11). Page 2 of 10 www.altera.com/enpirion