Microchip MIC3203 Handleiding

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 2019 Microchip Technology Inc. DS20006250A-page 1

MIC3203/MIC3203-1

Features

• 4.5V to 42V Input Voltage Range

• High Efficiency (>90%)

• ±5% LED Current Accuracy

• MIC3203: Dither Enabled for Low EMI

• MIC3203-1: Dither Disabled

• High-Side Current Sense

• Dedicated Dimming Control Input

• Hysteretic Control (No Compensation)

• Up to 1.5 MHz Switching Frequency

• Adjustable Constant LED Current

• Overtemperature Protection

• –40°C to +125°C 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)

General Description

The MIC3203 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 MIC3203 is well suited for lighting applications that

require 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

comparator delivers LED current with ±5% accuracy.

An external high-side current-sense resistor is used to

set the output current.

The MIC3203 offers a dedicated PWM input (DIM) that

enables a wide range of pulsed dimming. A

high-frequency switching operation up to 1.5 MHz

allows the use of smaller external components

minimizing space and cost. The MIC3203 offers

frequency dither feature for EMI control.

The MIC3203 operates over a junction temperature

from –40°C to +125°C and is available in an 8-pin SOIC

package.

A dither disabled version MIC3203-1 is also available in

the same package as the MIC3203.

Package Type

MIC3203

8-Lead SOIC (M)

(Top View)

1VCC

VIN

AGND

8 DRV

PGND

DIM

High-Brightness LED Driver Controller with High-Side Current Sense

MIC3203/MIC3203-1

DS20006250A-page 2  2019 Microchip Technology Inc.

Typical Application Circuit

MIC3203

STEP OWN RIVER-D LED D

10μF

VCC

1μF

MOSFET

MIC3203YM

MIC3203-1YM

VIN

DIM

DRV

VCC

AGND

PGND

LEDs

Nȍ

Functional Block Diagram

(4.5V – 42V)

10μF

LED1 LED2 LED3 LED4 LED5 LED6

VIN

DIM

REGULATOR

177mV

35mV

DITHER

MIC3203 ONLY

THERMAL

SHUTDOWN

UVLO

VCC

10μF

DRV

Nȍ

PGND

SGND

 2019 Microchip Technology Inc. DS20006250A-page 3

MIC3203/MIC3203-1

1.0 ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings †

VIN to PGND .............................................................................................................................................. –0.3V to +45V

VCC to PGND ............................................................................................................................................ –0.3V to +6.0V

CS to PGND.................................................................................................................................... –0.3V to (V

IN + 0.3V)

EN to AGND.................................................................................................................................... –0.3V to (V

IN + 0.3V)

DIM to AGND .................................................................................................................................. –0.3V to (V

IN + 0.3V)

DRV to PGND ................................................................................................................................ –0.3V to (V

CC + 0.3V)

PGND to AGND........................................................................................................................................–0.3V to +0.3V)

ESD Rating (Note 1) ..................................................................................................................................... 1.5 kV, HBM

ESD Rating (Note 1) ......................................................................................................................................... 200V, MM

Operating Ratings ††

Supply Voltage (VIN) .................................................................................................................................. +4.5V to +42V

Enable Input Voltage (V

EN) ................................................................................................................................ 0V to V

Dimming Input Voltage (VDIM)............................................................................................................................ 0V to V