Microchip MIC23451 Bedienungsanleitung
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MIC23451
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MIC23451 Evaluation Board
3MHz PWM Triple 2A Buck Regulator with
HyperLight Load
®
and Power Good
HyperLight Load is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 14, 2013
Revision 1.0
General Description
This board allows the customer to evaluate the MIC23451,
a fully-integrated, triple-output, 2A, 3MHz switching
regulator that features HyperLight Load
®
mode and Power
Good output indicators. The MIC23451 is highly efficient
throughout the output current range, drawing just 24µA of
quiescent current for each channel in operation. The tiny
4mm × 4mm DFN package saves precious board space
and requires few external components. The MIC23451
provides accurate output voltage regulation under the most
demanding conditions, with each channel responding
extremely quickly to a load transient with exceptionally
small output voltage ripple.
Requirements
This board needs a single 20W bench power source
adjustable from 2.7V to 5.5V. The loads can be either
active (electronic load) or passive (resistor), and must be
able to dissipate 10W. It is ideal, but not essential, to have
an oscilloscope available to view the circuit waveforms.
The simplest tests require two voltage meters to measure
input and output voltage. Efficiency measurements for a
single channel require two voltage meters and two
ammeters to prevent errors caused by measurement
inaccuracies.
Precautions
There is no reverse input protection on this board. Be
careful when connecting the input source to make sure
correct polarity is observed.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com
.
Getting Started
1. Connect an external supply to the V
IN
(J1) terminal
and GND (J2).
With the output of the power supply disabled, set its
voltage to the desired input test voltage (2.7V ≤ V
IN
≤
5.5V). An ammeter may be placed between the input
supply and the V
IN
(J1) terminal. Be sure to monitor
the supply voltage at the V
IN
(J1) terminal, as the
ammeter and/or power lead resistance can reduce the
voltage supplied to the device.
2. Connect a load to the V
OUT
terminals (J6, J7, J8)
and ground (J3, J4, J5) terminals.
The load can be either passive (resistive) or active
(electronic load). An ammeter may be placed between
the loads and the output terminals. Make sure the
output voltage is monitored at the V
OUT
(J6, J7, J8)
terminals.
3. Enable the MIC23451.
The MIC23451 evaluation board has a pull-up resistor
to V
IN
for each channel. By default, each output voltage
is enabled when an input supply of >2.7V is applied.
To disable the device, apply a voltage below 0.4V to
the EN (J10, J12, J14) terminals.
4. Power Good.
The board provides a Power Good test point (J9, J11,
J13) to monitor the Power Good function for each
individual channel. The Power Good output goes high
(V
OUT
) approximately 60µs after the output voltage
reaches 90% of its nominal voltage.
Ordering Information
Part Number Description
MIC23451-AAAYFL EV Adjustable Output Evaluation Board
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | MIC23451 |
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