EVB-EN5395QI

Enpirion® Power Evaluation Board User Guide EN5395QI PowerSoC Enpirion EN5395QI 9A DCDC Converter w/Integrated Inductor Evaluation Board Introduction Thank you for choosing Altera Enpirion power products. • The EN5395QI features integrated inductor, power MOSFETS, Controller, Compensation Network, and protection circuitry against system faults. This level of integration delivers a substantial reduction in footprint and part count over competing solutions. However, the evaluation board is not optimized for minimum footprint; rather for engineering ease of evaluation through programming options, clip leads, test points etc. • The EN5395QI features 7 precision preset output voltages selectable via 3 pin VID (Voltage ID) input. The module requires only ceramic input and output capacitors, and a small capacitor for programming soft-start interval. • The input capacitor is a 10V rated 2X47uF X5R MLCC. The output filter section is populated with 5 x 22uF, 6.3V rated X5R MLC capacitors to achieve the required ~100uF of output capacitance. The combination of 5 x 22uF caps yields very low ESR and hence low output ripple. 2X47uF capacitor may be substituted if minimizing footprint is more important. The Soft-start capacitor is a small 10V rated 15nF X5R MLCC. • Jumpers are provided for ease of logical 1/0 programming of the following signals: o Enable o VS0-VS2 output voltage select 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 EN5395QI PowerSoC Quick Start Guide Figure 1 shows a top view of the evaluation board. WARNING: complete steps 1 through 4 before applying power to the EN5395QI evaluation board. STEP 1: Set the “ENA” jumper to the Disable Position. STEP 2: Set the VID pins for the desired output voltage - Refer to Table-1. CAUTION: VID pins MUST NOT be changed while the EN5395QI is enabled. Doing so could result in damage to the part. STEP 3: Connect Power Supply to the input power connectors, VIN (+) and GND (-) as indicated in Figure 1 and set the power supply to the desired voltage CAUTION: be mindful of the polarity. Even though the evaluation board comes with reverse polarity protection diodes, it is rarely a good idea to reverse the input polarity. STEP 4: Connect the load to the output connectors VOUT (+) and GND (-), as indicated in Figure 1. STEP 5: Power up the board and move the ENA jumper to the enabled position. The EN5395QI is now powered up and generating the desired output. STEP 5A: Power Up/Down Behavior – Remove ENA jumper and connect a pulse generator (output disabled) signal to the middle pin of ENA and Ground. Set the pulse amplitude to go from 0 to 2.5 V. Set the pulse period to 10 msec. and duty cycle to 50%. Hook up oscilloscope probes to ENA, SS and VOUT with clean ground returns. Enable pulse generator output. Observe the SS capacitor and VOUT voltage ramps as ENA goes high and again as ENA goes low. Page 2 of 7 www.altera.com/enpirion Enpirion® Power Evaluation Board User Guide EN5395QI PowerSoC Output Voltage Select Output Enable VOUT (+) VIN (+) CSS (C1) Decoupling Cap (to decouple supply Reverse polarity protection diodes GND (-) GND (-) COUT 5 x 22uF 1206 CIN 2 x 47uF 1210 Figure 1. Evaluation Board Layout. Output Voltage Select The EN5395QI utilizes 3 pins to set the output voltage to one of 7 precision preset output voltages. The VID pins, labeled VS[0:2] can be readily set to a logical 0/1 by means of the jumpers provided. A open pin would default to a logical 1 state utilizing the internal pull up. However, tying the pin to a logical 1 by means of a jumper is always recommended. Table 1. Output Voltage Select Truth Table WARNING: Voltage select pins must not be switched while part is enabled. Doing so could result in damage to the part. Always disable part when changing output voltage setting. Page 3 of 7 www.altera.com/enpirion Enpirion® Power Evaluation Board User Guide EN5395QI PowerSoC Test Recommendations Recommendations To guarantee measurement accuracy, the following precautions should be observed: 1. Make all input and output voltage measurements at the board using the test points provided. This will eliminate voltage drop across the line and load cables that can produce false readings. 2. Measure input and output current with series ammeters or accurate shunt resistors. This is especially important when measuring efficiency. 3. Use a balanced impedance probe tip to measure switching signals to avoid noise coupling into the probe ground lead. Output ripple and load transient deviations are best measured at TP8. 4. The board includes a 5.6k pull-up for the POK signal and ready to monitor the power OK status. 5. A 15nF soft-start capacitor is populated on the board for ~1msec softstart time. 6. This evaluation board is not set up for paralleling multiple devices for greater load capability. A separate evaluation board is available that demonstrates a method for parallel operation of 2 EN5395QI devices. 7. The over-current protection circuit typically limits the maximum load current to approximately 1.5X the rated value – viz. 9A. However, this is somewhat adjustable via the ROCP pin. Please consult our Applications Engineering group for assistance in using this feature. 8. DERATING: The evaluation board may not be operated with maximum power dissipation (input power – output power) beyond a certain temperature (reference current derating curves in figure 2) for extended periods of time. The device will shut down when the internal junction temperature exceeds ~150°C. Page 4 of 7 www.altera.com/enpirion Enpirion® Power Evaluation Board User Guide EN5395QI PowerSoC Figure 2. Current Derating Curves Page 5 of 7 www.altera.com/enpirion Enpirion® Power Evaluation Board User Guide EN5395QI PowerSoC Input and Output Capacitors The input capacitance requirement is 2X47uF for the EN5395QI. Altera recommends that a low ESR MLCC capacitor be used. The voltage rating should be high enough to provide adequate margin for your application. The output capacitance requirement is 5X22uF of capacitance and comes populated with 5, 22uF 1210 6.3V MLCCs. M/S ENABLE VS0 VS1 VS2 1 2 3 5 6 7 9 10 11 13 14 15 17 18 19 NOTE: Capacitors must be X5R or X7R dielectric formulations to ensure adequate capacitance over operating voltage and temperature ranges. J1 ASP12192002 FB1 10u AVIN TP2 TP3 43 44 VS2 45 VS0 VS1 46 POK 47 48 SS VSENSE EAIN TP4 1 1 51 50 49 COMP EAOUT 52 53 PWM ENABLE 54 NC 56 55 41 TP13 1 TP12 40 39 AVIN 38 37 36 35 34 R2 1 33 32 J2 31 VIN 30 PGND PGND PVIN 1210 29 42 59 PGND PGND 27 28 PGND PGND NC PGND PVIN NC NC NC PVIN 26 C9 22uF NC PVIN NC 24 C8 22uF NC VOUT 1210 1206 C7 22uF PVIN 25 C6 22uF NC 21 C5 22uF PVIN 14 1 2 1206 TP8 1206 1206 13 NC 22 12 PVIN 23 1 NC U1 EN5365Q/95Q NC VOUT TP7 NC VOUT 11 NC 19 10 ROCP NC 20 J3 AVIN NC(VDRAIN) VOUT 9 GND NC(VDRAIN) 18 8 AGND VOUT 7 C1 15n 1 NC NC(PGND) VOUT 5 6 XOV GND_SENSE 16 TP5 NC R1 5.62k 1 NC 17 4 M/S 58 1 NC NC 3 VOUT 2 1 15 1 TP11 57 TP1 1210 C10 C4 47uF C3 47uF U2 6.5V D1 + 1 TP6 1 TP9 C2 150 S2A VOUT TP10 J5 1 Pin 59 is the PGND pad on the bottom of the part. Minimum 44 vias in the thermal pad. VOUT EN5395QI Evaluation Board Schematic Page 6 of 7 www.altera.com/enpirion J4GND Enpirion® Power Evaluation Board User Guide EN5395QI PowerSoC Contact Information Altera Corporation 101 Innovation Drive San Jose, CA 95134 Phone: 408-544-7000 http://www.altera.com © 2013 Altera Corporation—Confidential. All rights reserved. ALTERA, ARRIA, CYCLONE, ENPIRION, HARDCOPY, MAX, MEGACORE, NIOS, QUARTUS and STRATIX words and logos are trademarks of Altera Corporation and registered in the U.S. Patent and Trademark Office and in other countries. All other words and logos identified as trademarks or service marks are the property of their respective holders as described at www.altera.com/common/legal.html. Altera warrants performance of its semiconductor products to current specifications in accordance with Altera's standard warranty, but reserves the right to make changes to any products and services at any time without notice. Altera assumes no responsibility or liability arising out of the application or use of any information, product, or service described herein except as expressly agreed to in writing by Altera. Altera customers are advised to obtain the latest version of device specifications before relying on any published information and before placing orders for products or services. Page 7 of 7 www.altera.com/enpirion