Rainbow-electronics MAX16820 Manual do Utilizador descarregar pdf

General Description

The MAX16819/MAX16820, step-down constant-current

high-brightness LED (HB LED) drivers provide a cost-

effective solution for automotive interior/exterior lighting,

architectural and ambient lighting, LED bulbs such as

MR16 and other LED illumination applications.

The MAX16819/MAX16820 operate from a 4.5V to 28V

input voltage range and feature a 5V/10mA on-board

regulator. A high-side current-sense resistor adjusts the

output current and a dedicated PWM input (DIM)

enables a wide range of pulsed dimming.

The MAX16819/MAX16820 are well suited for applica-

tions requiring a wide input voltage range. The high-side

current-sensing and an integrated current-setting circuit-

ry minimize the number of external components while

delivering an LED current with ±5% accuracy. A hys-

teretic control algorithm ensures excellent input-supply

rejection and fast response during load transients and

PWM dimming. The MAX16819 features a 30% inductor

current ripple and the MAX16820 features a 10% current

ripple. These devices operate up to 2MHz switching fre-

quency, thus allowing for small component size.

The MAX16819/MAX16820 operate over the -40°C to

+125°C automotive temperature range and are avail-

able in 3mm x 3mm x 0.8mm, 6-pin TDFN packages.

Applications

Architectural, Industrial, and Ambient Lighting

Automotive RCL, DRL, and Fog Lights

MR16 and Other LED Bulbs

Indicators and Emergency Lighting

Features

o High-Side Current Sense

o Dedicated Dimming Control Input

o 20kHz Maximum Dimming Efficiency

o Hysteretic Control: No Compensation

o Up to 2MHz Switching Frequency

o ±5% LED Current Accuracy

o Adjustable Constant LED Current

o 4.5V to 28V Input Voltage Range

o Over 25W Output Power

o 5V, 10mA On-Board Regulator

o -40°C to +125°C Operating Temperature Range

Note: All devices are specified over the -40°C to +125°C oper-

ating temperature range.

Denotes lead-free package.

EP = Exposed paddle.

MAX16819/MAX16820

2MHz High-Brightness LED Drivers with

High-Side Current Sense and 5000:1 Dimming

________________________________________________________________

Maxim Integrated Products

654

DIM

CSN

GND

DRV

MAX16819

MAX16820

TDFN

TOP VIEW

PART PIN-PACKAGE PKG CODE

TOP

MARK

MAX16819ATT+T 6 TDFN–EP* T633-2 +ATB

MAX16820ATT+T 6 TDFN-EP* T633-2 +ATC

Pin Configuration

Ordering Information

MAX16819

MAX16820

CSN

DIM

DRV

GND

VCC

SENSE

Typical Operating Circuit

19-0706; Rev 1; 3/07

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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MAX16819/MAX16820 1

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Página 1 - MAX16819/MAX16820

General DescriptionThe MAX16819/MAX16820, step-down constant-currenthigh-brightness LED (HB LED) drivers provide a cost-effective solution for automot

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MAX16819/MAX168202MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 DimmingMaxim cannot assume responsibility for use of any cir

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MAX16819/MAX168202MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming2 ___________________________________________________

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MAX16819/MAX168202MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming_____________________________________________________

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MAX16819/MAX168202MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming4 ___________________________________________________

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MAX16819/MAX16820PWM DIMMING AT 20kHz (10% DUTY CYCLE)MAX16819 toc1210µs/divVDIM2V/div0V0AILED200mA/divVIN = 24V, L = 47µH,4 LEDS MAX16820PWM DIMMING

Página 7

MAX16819/MAX168202MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming6 ___________________________________________________

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Undervoltage Lockout (UVLO)The MAX16819/MAX16820 include a 4.5V undervoltagelockout (UVLO) with 500mV hysteresis. When VINfallsbelow 4.5V, DRV goes lo

Página 9

MAX16819/MAX16820MOSFET SelectionThe MAX16819/MAX16820’s gate driver is capable ofsourcing 0.5A and sinking 1A of current. MOSFET selec-tion is based

Página 10

MAX16819/MAX168202MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming_____________________________________________________

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Rainbow-electronics MAX16820 Manual do Utilizador

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