EVB-EN5329QI

EN5329QI Evaluation Board User Guide April 2013 R1.0 EN5329QI 2A Synchronous DC/DC Converter Evaluation Board User Guide Introduction Thank you for choosing Enpirion, the source for ultra small foot print power converter products that offer true ease of design with no compromise on performance. This evaluation board user guide applies to the EN5329 devices mounted on PCB’s with the part number 08251 rev A on the backside. This user guide should be used together with the latest device datasheet. The datasheet can be found at www.enpirion.com. Following are the features of this evaluation board. • • • • • • • • • Populated with one EN5329QI 2A PowerSoC with integrated inductor. Pre-tinned pads are available for a wide range of input and output capacitor configurations. There are four positions available for the output capacitors. The first position, closest to the IC, can accommodate a 1206, 0805, or 0603 case size while the other three positions can accommodate either 0805 or 0603 capacitor case sizes. The base output capacitor configuration is 2 x 22uF 0603 MLCC. Refer to the product datasheet for output capacitor requirements. There are two positions for the input capacitors. The first position, closest to the IC, can accommodate an 0805 or 0603 case size while the other position can accommodate an 0805 case size. The base input capacitor configuration is a single 22uF 0805 MLCC. Refer to the product datasheet for input capacitor requirements. Output voltage programming is accomplished via a simple resistor divider. Jumpers are provided for 4 pre-configured output settings. These settings are as follows: • 1.0V, 1.2V, 1.5V, 1.8V Easy jumpers are provided for the following signals: • Enable Numerous test points are provided as well as clip leads for input and output connections The board comes with input decoupling and reverse polarity protection. Page 1 of 6 Enpirion 2013 all rights reserved, E&OE www.enpirion.com EN5329QI Evaluation Board User Guide April 2013 R1.0 Quick Start Guide Figure 1 shows a photograph of the evaluation board. Please refer to this figure while configuring the board for evaluation. STEP 1: Set the “ENABLE” jumper to the Disable Position. ENABLE DISABLE STEP 2: Select the desired VOUT voltage setting by placing the jumper J2 on the correct jumper pin. Figure below shows the VOUT jumper options and their nominal voltages. Note that depending on the tolerance of the resistors populated on the board, each output voltage setting may have a larger tolerance than just the VFB pin as specified in the datasheet. Please see Figure 3 and the Bill of Materials section. Multiple jumpers can be populated to get other output voltages not listed below. With the resistors shown below, if all 4 jumper positions are populated, the output voltage will be approximately 3.7V. Note that for any VOUT higher than 3.3V, the output capacitors need to be changed to 2 x 22uF/0805. CAUTION: the VOUT jumper settings can only be changed when the device is off. Failure to follow this guideline may result in damage to the part. Please note: The loop compensation circuit for this evaluation board has been chosen for a wide range of VIN and VOUT values. In order to optimize the loop for any specific VIN/VOUT operating point, please see the compensation table in the datasheet. See Figures 1 and 3. Page 2 of 6 Enpirion 2013 all rights reserved, E&OE www.enpirion.com EN5329QI Evaluation Board User Guide April 2013 R1.0 STEP 3: Connect a Power Supply to the input power connectors, VIN (J4) and GND (J5). DO NOT turn the power supply on yet. CAUTION: Be mindful of the input voltage magnitude and polarity. Even though the evaluation board comes with reverse polarity protection diodes, it may not protect the device under all conditions. STEP 4: Connect an electronic load, or load board to the load to the output connectors VOUT (J6) and GND (J7). STEP 5: Turn on the input supply, and move the ENABLE jumper to the enabled position. The EN5329QI is now powered up. J2 VOUT Jumpers ENABLE C9 = Ca Output Capacitors Input Capacitor Figure 1. Evaluation Board top view. Page 3 of 6 Enpirion 2013 all rights reserved, E&OE www.enpirion.com EN5329QI Evaluation Board User Guide April 2013 R1.0 Test Recommendations To guarantee measurement accuracy, the following precautions should be observed: Make all input and output voltage measurements at the board using the test points provided (TP5 to TP8). This will eliminate voltage drop across the line and load cables that can produce false readings. Measure input and output current with series ammeters or accurate shunt resistors. This is especially important when measuring efficiency. Use a low-loop-inductance scope probe tip similar to the one shown in Figure 2 to measure switching signals and input / output ripple to avoid noise coupling into the probe ground lead. Input ripple, output ripple, and load transient deviation are best measured near the respective input / output capacitors. For more accurate ripple measurement, please see Enpirion App Note regarding this subject. Figure 2. Recommended probe configuration. If you need to measure radiated EMI, place a 10uF/0805, X7R capacitor at the input and output edges of the PCB (C13 and C14 positions), and connect the PVIN power and the load to the board at or near these capacitors. The added capacitor at the input edge is for high-frequency decoupling of the input cables. The one added at the output edge is meant to represent a typical load decoupling capacitor. Page 4 of 6 Enpirion 2013 all rights reserved, E&OE www.enpirion.com EN5329QI Evaluation Board User Guide April 2013 R1.0 Evaluation Board Schematic J1 1 2 3 ENABLE Vin FB1 TP1 1 2 C10 R4 C12 0805 VIN TP8 1 TP9 C8 + D1 18 17 0805 15 14 J5 13 R6 TP17 0805 R5 0805 R3 GND 0805 TST2 TST1 11 10 PGND 9 VOUT PGND 8 7 5 C1, C4-6 should be combination 0805/0603. C3 should be combination 1206/0805/0603. NC(13) VOUT VOUT VOUT TP10 POK 19 PVIN 21 22 20 PVIN NC(SW)21 NC(SW)22 ENABLE VFB 16 R2 4 AGND EN53x9 U1 PGND C13 VIN R7 0805 3 1 AVIN PGND J4 TP3 TST0 2 1 TP16 NC(SW)1 1 6 8 6 4 2 J6 J2 TP7 VOUT 1 VOUT 7 5 1 C3 1206 3 TP6 Input Protection Vin 12 1 PGND NC(SW)23 NC(SW)24 1 C9 R1 C11 0805 TP5 24 TP11 23 POK TP4 0805 Vin 0603 1 C1 0805 C4 0805 VOUT TP18 C14 J7 VOUT C5 0805 C6 0805 GND TP19 2 1 Short across R8 when all other routing completed TP2 R8 2 1 TP15 2 1 TP14 TP12 TP13 SCH PCB 06783 08251 Figure 3. Engineering Evaluation board schematic. Page 5 of 6 Enpirion 2013 all rights reserved, E&OE www.enpirion.com EN5329QI Evaluation Board User Guide April 2013 R1.0 Bill of Materials Designator Qty C1 C3, C4 C8 C9 C10 C11 C5, C6, C12-C14, R8 D1 FB1 J1 J2 J4-J7 R1, R3 R2 R4 R5 R6 R7 TP5-TP9, TP16-TP19 U1 1 2 1 1 1 1 CAP CERAMIC 22UF 10V 0805 X5R CAP CER 22UF 6.3V X5R 0603 CAPACITOR, SMT ELECTROLYTIC, 150UF, 20%, 10V CAP CERM 8.2PF 50V NP0 0805 CAP, 10UF 0805 X7R 10% 10V CERAMIC CAPACITOR CER 1UF 10V X5R 0603 Description 6 NOT USED 1 1 1 1 4 2 1 1 1 1 1 TVS UNIDIRECT 600W 6.5V SMBJ6.5A SMT FERRITE BEAD 4A 0805, Wurth Electronik 742792012 CONNECTOR HEADER, 3 POSITION, Samtec ASP-121920-02 CONNECTOR HEADER, 8 POSITION Dual, Samtec TSW-104-24-T-D BANANA JACK, KEYSTONE 575-4 RES 348K OHM 1/8W 1% 0805 RES 523K OHM 1/8W 1% 0805 SMD RES 100K OHM 1/8W 1% 0805 SMD RES 232K OHM 1/8W 1% 0805 SMD RES 174K OHM 1/8W 1% 0805 SMD RES ZERO OHM 1/8W 5% 0805 SMD 9 TEST POINT SURFACE MOUNT, KEYSTONE 5016 1 EN5329QI QFN 2A Contact Information Enpirion, Inc. Perryville III 53 Frontage Road Suite 210 Hampton, NJ 08827 Phone: +1 908-894-6000 Fax: +1 908-894-6090 Enpirion reserves the right to make changes in circuit design and/or specifications at any time without notice. Information furnished by Enpirion is believed to be accurate and reliable. Enpirion assumes no responsibility for its use or for infringement of patents or other third party rights, which may result from its use. Enpirion products are not authorized for use in nuclear control systems, as critical components in life support systems or equipment used in hazardous environment without the express written authority from Enpirion. Page 6 of 6 Enpirion 2013 all rights reserved, E&OE www.enpirion.com