EN63A0QI Evaluation Board User Guide Nov 2010 Enpirion EN63A0QI 12A DC/DC Converter w/Integrated Inductor Evaluation Board Introduction Thank you for choosing Enpirion, the source for ultra small foot print power converter products. This user guide should be used together with the latest device datasheet. The EN63A0QI 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. This evaluation board is optimized for ease of use through programming options, clip leads, test points, etc. The EN63A0QI 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 (V -V ). The IN DROPOUT Dropout voltage is ~0.05*I (see Figure 1). The evaluation board, as LOAD shipped is populated with a single R , and three possible R resistors. The A B R resistors can be chosen by jumper settings to achieve several output B voltages. The EN63A0QI includes the bulk of the compensation network internally. However, an external phase-lead (zero) capacitor and resistor is required as part of the feedback. This network is shown in Figure 1. Appropriate component values allow for optimum compensation for a given Input voltage and choice of loop bandwidth. The equations in Figure 1 provide the details to calculate the component values. A footprint is provided for a SMC connector (not populated) for S IN. A clock source may be applied to S IN to synchronize the device switching frequency to the external source. Please see the datasheet for the frequency lock frequency range. S OUT will output a clock signal synchronous with the switching frequency. S OUT of one EN63A0QI may be connected to S IN of another EN63A0QI device. Jumpers are provided for logical programming of the following signals: o ENABLE (ENA) o Master/Slave ternary input (M/S) o Enable Pre-Bias Input (SEL) Enable may also be controlled using an external switching source by removing the jumper and applying the enable signal to the connector middle pin and ground. o Jumpers are also provided for getting various output voltages. Page 1 of 9 EN63A0QI Evaluation Board User Guide Nov 2010 The board comes with input decoupling and reverse polarity protection to guard the device against common setup mishaps. The board also has soldermask openings for 0805 ceramic capacitors at the input and output edges. If you are planning to do radiated any EMI testing on this board, place a 10uF, 0805, X7R or X5R capacitor at each board edge. The added capacitor at the input edge is for high-frequency decoupling of the input cables. The added capacitor at the output edge is meant to represent a typical load decoupling capacitor. R = 48,400 V (R /V in / V) V A IN A IN OUT - 6 C A 4.6 10 C = (C /R in F/) A A A R R A A Round C down to closest A R 1 available value lower than the calculated value. V FB V is 0.6V V R FB FB A R = B R B V - V nominal OUT FB R = 12 k 1 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 VIN or logic High. WARNING: complete steps 1 through 4 before applying power to the EN63A0QI evaluation board. STEP 1: Set the ENA jumper to the Disable Position. Page 2 of 9