Enpirion
®
Power Evaluation Board User Guide
EN63A0QI PowerSoC
Enpirion EN63A0QI 12A DC/DC Converter
w/Integrated Inductor Evaluation Board
Introduction
Thank you for choosing Altera
®
Enpirion power products!
This user guide should be used together with the latest device datasheet.
•
The EN63A0QI features integrated inductor, power MOSFETS, controller,
bulk of the compensation network, and protection circuitry against system
faults. This level of integration delivers a substantial reduction in footprint
and part count over competing solutions. This evaluation board is
optimized for ease of use through programming options, clip leads, test
points, etc.
•
The EN63A0QI features a customer programmable output voltage by
means of a resistor divider. The resistor divider allows the user to set the
output voltage to any value within the range 0.6V to (V
IN
-V
DROPOUT
). The
Dropout voltage is ~0.05*I
LOAD
(see Figure 1). The evaluation board, as
shipped is populated with a single R
A
, and three possible R
B
resistors. The
R
B
resistors can be chosen by jumper settings to achieve several output
voltages.
•
The EN63A0QI includes the bulk of the compensation network internally.
However, an external phase-lead (zero) capacitor and resistor is required
as part of the feedback. This network is shown in Figure 1. Appropriate
component values allow for optimum compensation for a given Input
voltage and choice of loop bandwidth. The equations in Figure 1 provide
the details to calculate the component values.
•
A footprint is provided for a SMC connector (not populated) for S_IN. A
clock source may be applied to S_IN to synchronize the device switching
frequency to the external source. Please see the datasheet for the
frequency lock frequency range. S_OUT will output a clock signal
synchronous with the switching frequency. S_OUT of one EN63A0QI may
be connected to S_IN of another EN63A0QI device.
•
Jumpers are provided for logical programming of the following signals:
o
ENABLE (ENA)
o
Master/Slave ternary input (M/S)
o
Enable Pre-Bias Input (SEL)
Enable may also be controlled using an external switching source by
removing the jumper and applying the enable signal to the connector
middle pin and ground.
o
Jumpers are also provided for getting various output voltages.
•
The board comes with input decoupling and reverse polarity protection to
guard the device against common setup mishaps.
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