Microchip MIC3202-1 Handleiding

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MIC3202/MIC3202-1

High-Brightness LED Driver with

Integrated MOSFET and High-Side

Current Sense

944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.comMicrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408)

Septembe M9999-091710-A

r 2010

General Description

The MIC3202 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.

The MIC3202 is well suited for lighting applications

requiring a wide-input voltage range. The hysteretic control

gives good supply rejection and fast response during load

transients and PWM dimming. The high-side current

sensing and on-chip current-sense amplifier delivers LED

current with ±5% accuracy. An external high-side current-

sense resistor is used to set the output current.

The MIC3202 offers a dedicated PWM input (DIM) which

enables a wide range of pulsed dimming. High-frequency

switching operation of up to 1MHz allows the use of

smaller external components, minimizing space and cost.

The MIC3202 offers a frequency dither feature for low-EMI

applications.

The MIC3202 operates over a junction temperature from

− °+°40C to 125C and is available in an 8-pin e-PAD SOIC

package.

A dither disabled version MIC3202-1 is also available in

the same package as the MIC3202.

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

•6V to 37V input voltage range

• >High efficiency (90%)

• ±5% LED current accuracy

•MIC3202: Dither enabled for low EMI

•MIC3202-1: Dither disabled

•High-side current sense (up to 1A)

•Dedicated dimming control input

•Hysteretic control (no compensation required)

•Up to 1MHz switching frequency

•Adjustable constant LED current

•Over-temperature protection

• −°+°40C to 125C junction temperature range

Applications

•Architectural, industrial, and ambient lighting

•LED bulbs

•Indicators and emergency lighting

•Street lighting

•Channel letters

•12V lighting systems (MR-16 bulbs, under-cabinet

lighting, garden/pathway lighting)

_________________________________________________________________________________________________________________________

Typical Application

MIC3202 Step-Down LED Driver

Efficiency

vs. Input Voltage

80

85

90

95

100

614 22 30 38

INPUT VOLTAGE (V)

EFFICIENCY (%)

I

LED

= 1A

L = 47uH

8LED6LED

4LED

2LED

Product specificaties