Microchip MIC28304 Bedienungsanleitung

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MIC28304Evaluation Board

70V 3A Power Module

Hyper Speed Control™ Family

General Description

The MicrelMIC28304 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 canoperate in pulse skipping mode at light load.

However, it operates in fixed frequency CCM modefrom

medium load to heavy load. The MIC28304-2 has Hyper

Speed Control™ architecture, which operates in fixed

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 availableon

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. No external linear regulator is required

to power the internal biasing of the ICbecause the

MIC28304 has internal PVDD LDO. In the applications

with VIN < +5.5V, PVDDshould 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 IINwith a current

meter and monitor input voltage at VIN and GND

terminals witha 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 100kΩpull-up resistor

(R16) to VIN, which allows the output to be turned on

when PVDDexceeds 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 MIC28304 evaluation board.

4.Turn Power

Turn on the VIN supply and verify that the output

voltage is regulated to 5V.

Ordering Information

Part NumberDescription

MIC28304-1 5V EV

MIC28304-1 Evaluation

Board up to 5V Output

MIC28304-2 5V EV

MIC28304-2 Evaluation

Board up to 5V Output

MIC28304-1 12V EV

MIC28304-1 Evaluation

Board 12V Output

MIC28304-2 12V EV

MIC28304-2 Evaluation

Board 12V Output

Hyper LightLoad is a registered trademark and Hyper Speed Control is a 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

April 29, 2014

Revision 1.0

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