Enpirion Power Evaluation Board User Guide EP5357xUI PowerSoC Enpirion EP5357xUI DC/DC Converter Module Evaluation Board Introduction Thank you for choosing Altera Enpirion power products This application note describes how to test the EP5357xUI (EP5357LUI, EP5357HUI) converters using the Altera Enpirion 2.5mmx2.25mm Module EVAL BOARD shown in Fig. 1. In addition to this document you will also need the device datasheet for a thorough evaluation of the power converter module. The EP5357xUI 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 one additional input capacitor and two additional output capacitors for evaluation of performance over a wide range of input/output capacitor combinations. Pads are available to populate an external resistor divider to enable output voltage programming of values not available using the VID. The pads are labeled R1 and R2. Pads are also available for placing an optional feed- forward capacitor (labeled C9) across resistor R1. NOTE: The External voltage divider option is available only with EP5357LUI. Jumpers are provided for easy programming of the following signals: o Light load mode (LLM) o Enable o VS0-VS2 output voltage selection pins 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. Page 1 of 11 www.altera.com/enpirion Enpirion Power Evaluation Board User Guide EP5357xUI PowerSoC Quick Start Guide STEP 1: Before applying power to the board, set the ENABLE jumper to the Disable Position. Set VS0, VS1 and VS2 pins for the desired output setting. A voltage greater than 1.4V at LLM pin, will enable LLM, while a voltage less than 0.4V will disable it. CAUTION: the signal pins LLM, ENA, VS0, VS1 and VS2 must be connected to a logic high, jumper to the left, or a logic low, jumper to the right. It may not be left floating as the pin state would then be in an indeterminate state. STEP 2: Connect a power supply to the input test points, TP8 (VIN) and TP5 (GND) as indicated in Figure 1. The same test points can also be used to measure the input voltage. 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 EP5357LUI without the external resistors R1 and R2 will result in unpredictable behavior. STEP 4: Connect the load to the output connectors TP7 (VOUT) and TP6 (GND), as indicated in Figure 1.The same test points are also used to measure the DC output voltage. LLM LLM LLM LLM STEP 5: Connect the LLM (Light Load Mode) jumper as needed. A voltage greater than 1.4V will enable LLM, and less than 0.4V will disable LLM. LLM Enabled LLM Disabled STEP 6: Move the ENABLE jumper to the enabled position, and power up the board. The EP5357xUI should now be operational. Page 2 of 11 www.altera.com/enpirion