Enpirion Power Evaluation Board User Guide EV1340QI PowerSoC Enpirion EV1340QI 5A DC/DC Converter with Integrated Inductor Evaluation Board Introduction Thank you for choosing Altera Enpirion power products This user guide is applicable to evaluation boards with part number 05043 Rev A shown on the back side of the PCB. Along with this document you will also need the latest device datasheet. The EV1340QI features integrated inductor, power MOSFETS, Controller, bulk of the compensation Network, and protection circuitry against system faults. This level of integration delivers a substantial reduction in footprint and part count over competing solutions. The evaluation board is optimized for ease of use. The EV1340QI features a customer programmable output voltage by means of a resistor divider. This evaluation board, as shipped is populated with one option for V . It is programmed so that V will be half of OUT OUT VDDQ. The EV1340QI includes the bulk of the compensation network internally. However, an external phase-lead (zero) capacitor and resistor is required in addition to two resistor dividers to set the output voltage. This network is shown in Figure -1. Appropriate component values allow for optimum compensation for a given VDDQ voltage and choice of loop bandwidth. The values in Figure 1 are as populated on the eval board, and have been optimized for VDDQ = 1.5V. The circuit in Figure 1 will be stable for lower values of VDDQ as well. For VDDQ higher than 1.5V, please see the datasheet to calculate the resistor divider and compensation values. Jumpers or test points are provided for ease of logical 1/0 programming of the following signals: o ENABLE (ENA) o EN PB input ENABLE may also be controlled using an external switching source by removing the jumper and applying the enable signal to the middle pin and ground. The board comes with input decoupling and reverse polarity protection to guard the device against common setup mishaps. Page 1 of 7 www.altera.com/enpirion Enpirion Power Evaluation Board User Guide EV1340QI PowerSoC SCHOTTKY R = 15k , R = 10k C D V CNTRL V V DDQ TT SW R = 150k , R = 604k A B VDDQ VOUT C = 33 pF , R = 3.01k R A 1 1 R R C EV1340 A C IN C OUT1,2 ENABLE R R + R D A B C A V = VDDQ* * OUT AVIN VFB R + R R C D B PGND PGND With this circuit, V will be OUT VREF FQADJ AGND C SS R half of VDDQ. B C C R 1 AVIN FS R D Figure 1: Output voltage programming and loop compensation Quick Start Guide VIN GND SIDE SIDE Figure 2: J2 allows control of the Enable pin. The jumper on Enable pin as shown is in disable mode. When jumper is between the middle and right pins the signal pin is connected to ground or logic low. When the jumper is between the left and middle pins, the signal pin is connected to AVIN or logic High. WARNING: complete steps 1 through 6 before applying power to the EV1340QI evaluation board. STEP 1: Set the ENA jumper to the Disable Position. See Figure 2 above. STEP 2: Set the EN PB jumper J1 to the desired position. See Figure 3. Pulling it low disables the pre-bias mode operation. Pulling this jumper high or letting it float will allow monotonic start-up with a pre-biased output. In pre-bias mode, VOUT will not discharge very quickly. Therefore, you may need to apply a small load (~10mA) at shut-down to ensure that the output voltage discharges. In Figure 3 the jumper is set low to disable pre-bias mode. Figure 3: J1 controls EN PB input. Page 2 of 7 www.altera.com/enpirion