Preliminary Application Note EP53x8xQI Eval Board May 2008 V0.1 Enpirion EP53x8xQI DC/DC Converter Module Evaluation Board Introduction This application note describes how to test the following EP53x8xQI converters using the Enpirion 3x3 Module EVAL BOARD shown in Fig. 1: EP5368LQI, EP5368HQI, EP5388LQI, EP5388HQI, EP53A8LQI, and EP53A8HQI. In addition to this document you will also need the device datasheet. The EP53x8xQI converters are part of a new class of DC/DC converter products, a complete power system on silicon: These devices are complete modules including magnetics, and require only ceramic input and output capacitors. The evaluation board is designed to offer a wide range of engineering evaluation capabilities. This includes the base configuration of an 0603 input capacitor and an 0805 output capacitor. Pads are available to add up to one additional input capacitor and up to two additional output capacitors to allow for evaluation of performance over a wide range of input/output capacitor combinations. Pads are available to populate an external divider if desired. Easy jumpers are provided for the following signals: o Enable o VS0-VS3 output voltage select Numerous test points are provided as well as clip leads for input and output connections The board comes with input decoupling, and input reverse polarity protection to safeguard the device from common setup mishaps. Quick Start Guide STEP 1: Set the ENABLE jumper to the Disable Position. Jumper CAUTION: the signal pins ENA, VS0, VS1, VS2, and VS3 must be connected to a logic high, jumper to the left, or a logic low, jumper to the right. If left floating the state is Output Disabled indeterminate. STEP 2: Connect a power supply to the input test points, TP8 (+) and TP5 (-) as indicated in Figure 1. The same test points can also be used to measure the input voltage. Page 1 of 8 Enpirion Confidential Preliminary Application Note EP53x8xQI Eval Board May 2008 V0.1 CAUTION: be mindful of the polarity and the voltage magnitude. If V is IN greater than 6V, the board may get damaged. If the input voltage polarity is wrong, diode D1 will conduct, and draw excessive input current. STEP 3: Set the output voltage select pins for the desired output voltage. Refer to Tables 1 and 2 to determine the setting. CAUTION: the external resistor divider is not populated in the standard board configuration. Choosing the EXT option for the EP53x7LQI without the external resistors R1 and R2 1 0 will result in unpredictable behavior. STEP 4: Connect the load to the output connectors TP7 (+) and TP6 (-), as indicated in Figure 1.The same test points are also used to measure the DC output voltage. Output Voltage Select Output Enable C IN Decoupling Cap (to decouple supply cables) C OUT Reverse polarity diode Figure 1. Evaluation Board Layout. STEP 5: Move the ENABLE jumper to the enabled position, and power up the board. The EP53x8xQI should now be operational. Page 2 of 8 Enpirion Confidential