EN5365QI Evaluation Board Application Note
October 2006 V_1
Enpirion EN5365QI 6A DCDC Converter
w/Integrated Inductor Evaluation Board
Introduction
Congratulations! You are evaluating a complete power system on silicon:
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The EN5365QI features integrated inductor, power MOSFETS, Gate
Drive, Compensation Network, and controller and protection circuitry. This
level of integration delivers a substantial reduction in footprint and part
count over competing solutions.
The EN5365QI features a 3 pin VID output voltage selector and requires
only ceramic input and output capacitors, and a small capacitor for soft-
start programming. The 3 pin VID allows the user to choose from one of
seven predefined output voltage settings.
The input capacitor is a 10V rated 47uF X5R MLCC and the output
capacitor is a 6.3V rated 47uF X5R MLCC. The Soft-start capacitor is a
small 10V rated 15nF X5R MLCC.
Pads are available to add up to one additional input capacitor and up to
four additional output capacitors to allow for evaluation of performance
over a wide range of input/output capacitor combinations.
Easy jumpers are provided for the following signals:
o
Enable
o
VS0-VS2 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 reverse polarity protection to
protect the device from common setup mishaps.
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EN5365QI Evaluation Board Application Note
October 2006 V_1
Quick Start Guide
Figure 1 shows a top view of the evaluation board.
WARNING:
complete steps 1 through 4 before applying power
to the EN5365QI evaluation board.
STEP 1: Set the “ENA” jumper to the Disable Position.
Output Disabled
Jumper
STEP 2: Set the output voltage select pins for the desired output voltage setting.
Refer to the section on output voltage select to
determine the setting.
CAUTION:
Voltage select pins MUST NOT be
changed while the EN5365QI is enabled.
Doing so will result in damage to the part.
“0”
“1”
STEP 3: Connect Power Supply to the input power connectors, VIN (+) and
GND (-) as indicated in Figure 1.
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 EN5365QI is now powered up.
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EN5365QI Evaluation Board Application Note
October 2006 V_1
Figure 1. Evaluation Board Layout.
Output Voltage Select
The EN5365QI utilizes a 3 pin
output voltage selector. The output
voltage is programmed by setting
the VSx jumpers to either a logic
“1” or a logic “0” as described in the
Quick Start section. The voltage
select pins are pulled up internally
and so will default to a logic “1” if
left open.
Table 1 shows the truth table for
V
OUT
selection. There are seven
preset output voltage levels which
can be chosen via the VSx jumpers.
Table 1. Output Voltage Select Truth Table
WARNING:
Voltage select pins must not be adjusted while part is enabled.
Doing so will result in damage to the part. Always disable part when changing
output voltage setting.
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EN5365QI Evaluation Board Application Note
October 2006 V_1
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.
Input and Output Capacitors
The
input
capacitance requirement is 47uF for the EN5365QI. Enpirion
recommends that a low ESR MLCC capacitor be used. The voltage rating should
rated high enough to provide adequate margin for your application. There is a
pre-tinned pad for one additional 1210 capacitor to experiment with input filter
performance.
The
output
capacitance requirement is approximately 50uF of capacitance and
comes populated with a 47uF 1210 6.3V MLCC. The board has pre-tinned pads
for up to 4 additional output capacitors with 1210 or 1206 footprint. Various
combinations of output capacitor can be used to reduce effective series
resistance.
NOTE:
Capacitors must be X5R or X7R dielectric formulations.
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EN5365QI Evaluation Board Application Note
October 2006 V_1
Contact Information
Enpirion, Inc.
685 Route 202/206
Suite 305
Bridgewater, NJ 08807
Phone: 908-575-7550
Fax: 908-575-0775
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.
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