Microchip MIC28304 Manual

Microchip Ikke kategoriseret MIC28304

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Side 1/18
MIC28304 Evaluation Board
70V 3A Power Module
Hyper Speed Control™ Family
General Description
The Micrel MIC28304 is synchronous step -down regulator
module, featuring a unique adaptive ON time control -
architecture. The module incorporates a DC- -to DC
controller, power MOSFETs, bootstrap diode, bootstrap
capacitor, and an inductor in a single package. The
MIC28304 operates over an input supply range of 4.5V to
70V and can be used to supply up to 3A of output current.
The output voltage is adjustable down to 0.8V with a
guaranteed accuracy of ±1%. The device operates with a
programmable switching frequency from 200kHz to
600kHz.
The MIC28304-1 has the HyperLight Load® architecture,
so it can operate in pulse skipping mode at light load.
However, it operates in fixed frequency CCM mode from
medium load to heavy load. The MIC28304-2 has Hyper
Speed Control which operates in fixed ™ architecture,
frequency CCM mode under all load conditions.
The basic parameters of the evaluation board are:
• Input: 7V to 70V
• Output: 0.8V to 5V at 3A(1)
• 600kHz Switching Frequency (Adjustable 200kHz
to 600kHz)
Note:
1. Refer to temperature curves shown in the MIC28304 0.8V to 5V/3A
Evaluation Board Typical Characteristics section.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Requirements
The MIC28304-1 and MIC28304-2 evaluation board
requires only a single power supply with at least 10A
current capability. o external linear regulator is required N
to power the internal biasing of the IC because the
MIC28304 has internal PVDD LDO In the applications .
with VIN < +5.5V, PVDD should be tied to VIN to bypass
the internal linear regulator. The output load can either be
a passive or an active load.
Precautions
The MIC28304 evaluation board does not have reverse
polarity protection. Applying a negative voltage to the VIN
and GND terminals may damage the device. The
maximum VIN of the board is rated at 70V. Exceeding 70V
on the VIN could damage the device.
Getting Started
1. VIN Supply
Connect a supply to the VIN and GND terminals,
paying careful attention to the polarity and the supply
range (7V < VIN < 70V). Monitor with a current IIN
meter and input voltage at VIN and GND monitor
terminals with a voltmeter. Do not apply power until
step 4.
2. Connect Load and Monitor Output
Connect a load to the VOUT and GND terminals. The
load can be either a passive (resistive) or an active (as
in an electronic load) type. A current meter may be
placed between the VOUT terminal and load to
monitor the output current. Ensure the output voltage
is monitored at the VOUT terminal.
3. Enable Input
The EN pin has an on board 100kΩ pull-up resistor
(R16) to VIN, which allows the output to be turned on
when PVDD exceeds its UVLO threshold. An EN
connector is provided on the evaluation board for
users to easily access the enable feature. Applying an
external logic signal on the EN pin to pull it low or
using a jumper to short the EN pin to GND will shut off
the output of the 28304 evaluation boardMIC .
4. Turn Power
Turn on the VIN supply and verify that the output
voltage is regulated to 5V.
Ordering Information
Part Number Description
MIC28304- 1 5V EV MIC28304 Evaluation -1
Board up to 5V Output
MIC28304- 2 5V EV MIC28304 2 Evaluation -
Board up to 5V Output
MIC28304-1 12V EV MIC28304 Evaluation -1
Board 12V Output
MIC28304-2 12V EV MIC28304 Evaluation -2
Board 12V Output
Hyper LightLoad is a registered trademark and Hyper Speed Control trademark of Micrel, Inc. is a
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
April 29, 2014 Revision 1.0

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: MIC28304

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