MIC3203-1YM EV Micrel, MIC3203-1YM EV Datasheet

MIC3203-1YM EV

Manufacturer Part Number

MIC3203-1YM EV

Description

LED Lighting Development Tools HBLED Driver Controller with High-Side Current Sense - Evaluation Board

Manufacturer

Micrel

Datasheet

1.MIC3203-1YM_EV.pdf (7 pages)

Specifications of MIC3203-1YM EV

Product

Evaluation Boards

Operating Supply Voltage

4.5 V to 42 V

For Use With

MIC3203-1

Current page: 1 of 7
Download datasheet (233Kb)

General Description

The MIC3203/MIC3203-1 is a hysteretic step-down,

constant-current, High-Brightness LED (HB LED) driver.

It provides an ideal solution for interior/exterior lighting,

architectural and ambient lighting, LED bulbs, and other

general illumination applications.

This

MIC3203/MIC3203-1 for 1A LED current. The board is

optimized for ease of testing, with all the components on

a single side. The device operates from a 4.5V to 42V

input voltage range, and controls an external power

MOSFET to drive high current LEDs. When the input

voltage approaches and crosses UVLO threshold, the

internal 5V VCC is regulated and the external MOSFET

is turned on if EN pin and DIM pin are high. The inductor

current builds up linearly. When the CS pin voltage hits

the V

turned off and the Schottky diode takes over and returns

the current to V

LEDs starts decreasing. When CS pin hits V

external MOSFET is turned on and the cycle repeats.

Since the control scheme does not need loop

compensation, it makes for a very simple design and

avoids problems of instability.

Requirements

This board needs a single bench power source

adjustable over the input voltage of 4.5V < V

can provide at least 1A of current. The loads can either

be active (electronic load) or passive (LEDs) with the

ability to dissipate the maximum load power while

keeping accessible surfaces ideally < 70°C.

Precautions

There is no reverse input protection on this board. When

connecting the input sources, ensure that the correct

polarity is observed.

Under extreme load conditions input transients can be

quite large if long test leads are used. In such cases a

100µF, 63V electrolytic capacitor is needed at the V

terminals to prevent over voltage damage to the IC.

January 2011

CS(MAX)

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

board

with respect to V

enables

. Then the current through inductor and

the

, the external MOSFET is

evaluation

CS(MIN)

< 42V that

, the

the

408

Getting Started

Ordering Information

High Brightness LED Driver Controller

) 944-0800 • fax + 1 (408) 474-1000 •

1. Connect V

2. Enable the input supply. By default, the

MIC3203-1YM EV

MIC3203YM EV

Part Number

with High-Side Current Sense

and GND. With the output of this supply

disabled, set its voltage to the desired input test

voltage (4.5V < V

should be monitored at the test boards input

terminals to allow voltage drops in the test

cables (and ammeter if used) to be accounted

for. An ammeter can be added inline with the

current.

Connect the LEDs to the output terminals

between LED+ and LED−. This LED voltage

drop depends on manufacturer tolerance and

number of LEDs. The LED current can be

measured using an ammeter or current probe. A

4.7µF ceramic capacitor helps to reduce the

current ripple through the LED. The LED current

is set to 1A by current sense resistor R

200mΩ.

Selecting the sense resistor refers to the table

given in data sheet application sub-section.

controller is enabled when the input voltage

approaches UVLO threshold and crosses 5V,

the internal 5V VCC is regulated and the

external MOSFET is turned on if EN pin and

DIM pin are high. To use the EN and DIM

functions of the MIC3203/MIC3203-1, a test

point is provided for each of them.

MIC3203/MIC3203-1

Evaluation Board

input terminal to accurately measure input

supply to the input terminals V

< 42V). This supply voltage

http://www.micrel.com

MIC3203-1YM device

Evaluation board with

MIC3203YM device

Description

M9999-011311-B

i.e.,

Related parts for MIC3203-1YM EV

MIC3203-1YM EV Summary of contents

Page 1

... MOSFET is turned pin and DIM pin are high. To use the EN and DIM functions of the MIC3203/MIC3203-1, a test point is provided for each of them. Part Number Description Evaluation board with MIC3203YM EV MIC3203YM device Evaluation board with MIC3203-1YM EV MIC3203-1YM device http://www.micrel.com IN i.e., CS M9999-011311-B ...

Page 2

... Refer to the datasheet “Application Information” for more and LED+ information on components selection guidelines. IN Frequency Dithering The MIC3203 is designed to modulate the V amplitude ±6mV by a pseudo random generator to generate the ±12% of the switching frequency dithering to spread the frequency spectrum over a wider range and reduce the EMI noise peaks The MIC3203-1 is non-dithering version of the MIC3203 ...

Page 3

... INPUT VOLTAGE (V) * With regards January 2011 8LED 10LED L=150µH ILED= L=150µH ILED=1A 10LED 8LED MIC3203/3203-1 Evaluation Board Efficiency vs Input Voltage 100 90 80 4LED 6LED 8LED 70 10LED L=68µH ILED= ...

Page 4

... Micrel, Inc. Evaluation Board Schematic Notes bulk capacitor on input rail is away (4 inches or more) from the MIC3203/MIC3203-1, install the 100µF bulk capacitor near V 2. Source impedance should be as low as 10mΩ. January 2011 MIC3203/3203-1 Evaluation Board M9999-011311-B ...

Page 5

... Resistor, 1%, Size 0805 (8) Vishay 10kΩ Resistor, 1%, Size 0805 High Brightness LED Driver Controller with High-Side Current Sense-Frequency Dithering (9) Micrel, Inc. High Brightness LED Driver Controller with High-Side Current Sense-Frequency Non- Dithering 5 MIC3203/3203-1 Evaluation Board Qty ...

Page 6

... Micrel, Inc. PCB Layout Recommendations Top Assembly January 2011 Bottom Layer 6 MIC3203/3203-1 Evaluation Board Top Layer M9999-011311-B ...

Page 7

... A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. January 2011 http://www.micrel.com © 2010 Micrel, Incorporated. 7 MIC3203/3203-1 Evaluation Board M9999-011311-B ...

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