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EVB-EP5382QI

P1-P3P4-P6P7-P7
Enpirion
®
Power Evaluation Board User Guide
EP53x2Q PowerSoC
Using The External Voltage Divider
The EP53x2QI Evaluation Board is designed to provide a great deal of flexibility
in evaluating the performance of the Altera Enpirion DCDC module.
Pre-tinned pads are provided to place 0402 sized 1% resistors on the board to
implement an external resistor divider to choose an output voltage other than one
of the seven pre-set voltages available on the VID.
V
IN
V
Sense
V
in
V
S1
V
S2
V
S0
EP53x2
10µF
2.2uF
V
OUT
V
out
GND
ENABLE
R1
R2
V
FB
Figure 2. External divider schematic.
Figure 3 demonstrates the placement of the R1 and R2 resistors.
The output voltage is selected by the following formula:
( )
2
1
1603.0
R
R
OUT
VV +=
R
1
must be chosen as 200KΩ to maintain loop gain. Then R
2
is given as:
Ω
−
=
603.0
102.1
5
2
OUT
V
x
R
The external voltage divider option is chosen by setting the jumpers VS0, VS1,
and VS2 to a logic “high”.
Page 4 of 7
www.altera.com/enpirion
Enpirion
®
Power Evaluation Board User Guide
EP53x2Q PowerSoC
Figure 3. Placement of external divider resistors
Dynamically Adjustable Output
The EP53x2QI is designed to allow for dynamic switching between the
predefined voltage levels, or between the predefined output levels and an
external divider. The inter-voltage slew rate is optimized to prevent excess
undershoot or overshoot as the output voltage levels transition. The slew rate is
3mV/uS.
This feature can be tested by connecting the VSx jumper center pins to logic
driver to toggle between the various V
OUT
states.
Input and Output Capacitors
The input capacitance requirement is 2.2 uF for the EP5352QI and the
EP5362QI, and 4.7uF for the EP5382QI. Altera recommends that a low ESR
MLCC capacitor be used. The EP53x2QI Evaluation Board is populated with a
2.2uF 0805 capacitor. There are pre-tinned pads that allows for additional 0805
capacitors to experiment with input filter performance.
The output capacitance requirement is a minimum of 10uF. The control loop is
designed to be stable with up to 60uF of total output capacitance. The evaluation
board comes populated with a single 10uF 0805 capacitor.
The board has pre-tinned pads for up to 2 additional output capacitors with either
0805 or 1206 footprint.
Page 5 of 7
www.altera.com/enpirion
Enpirion
®
Power Evaluation Board User Guide
EP53x2Q PowerSoC
Capacitance above the 10uF minimum can be added if the transient performance
is not sufficient using the 10uF. Altera recommends a low ESR MLCC type
capacitor be used.
NOTE: Capacitors must be X5R or X7R dielectric formulations.
Contact Information
Altera Corporation
101 Innovation Drive
San Jose, CA 95134
Phone: 408-544-7000
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
Page 6 of 7
www.altera.com/enpirion
P1-P3P4-P6P7-P7

EVB-EP5382QI

Mfr. #:
Buy EVB-EP5382QI
Manufacturer:
Intel / Altera
Description:
Power Management IC Development Tools 800mA Sync Buck Regulator Eval Board
Lifecycle:
New from this manufacturer.
Delivery:
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