Rainbow-electronics MAX16822B Manual do Utilizador descarregar pdf (Página 1)

General Description

The MAX16822A/MAX16822B step-down constant-cur-

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

cost-effective design solution for automotive

interior/exterior lighting, architectural and ambient light-

ing, LED bulbs, and other LED illumination applications.

The MAX16822A/MAX16822B operate from a +6.5V to

+65V input-voltage range. A high-side current-sense

resistor adjusts the output current up to 350mA and a

dedicated pulse-width modulation (PWM) input enables

pulsed LED dimming over a wide range of brightness

levels.

These devices are well suited for applications requiring

a wide input-voltage range. The high-side current sens-

ing and an integrated current-setting circuitry minimize

the number of external components while delivering an

average output current with ±3% accuracy. A hysteretic

control method ensures excellent input supply rejection

and fast response during load transients and PWM dim-

ming. The MAX16822A allows 10% current ripple and

the MAX16822B allows 30% current ripple. Both

devices operate up to a switching frequency of 2MHz,

thus allowing the use of small-sized components.

The MAX16822A/MAX16822B offer an analog dimming

feature that reduces the output current by applying an

external DC voltage below the internal 2V threshold volt-

age from TEMP_I to GND. TEMP_I also sources 25µA to

a negative temperature coefficient (NTC) thermistor con-

nected between TEMP_I and GND, thus providing an

analog thermal-foldback feature that reduces the LED

current when the temperature of the LED string exceeds

a specified temperature point.

An additional feature includes thermal-shutdown pro-

tection that turns off the LX driver when the junction

temperature exceeds +165°C.

The MAX16822A/MAX16822B operate over the -40°C to

+125°C automotive temperature range and are available

in an 8-pin SO package.

Applications

Architectural, Industrial, and Ambient Lighting

Automotive RCL, DRL, and Fog Lights

Heads-Up Displays

Indicator and Emergency Lighting

Features

♦ High-Efficiency Solution

♦ 6.5V to 65V Input-Voltage Range

♦ On-Board 65V, 0.85Ω Power MOSFET

♦ Hysteretic Control: Up to 2MHz Switching

Frequency

♦ ±3% LED Current Accuracy

♦ 200mV Current-Sense Reference

♦ Resistor-Programmable Constant LED Current

♦ Integrated High-Side Current Sense

♦ Thermal-Foldback Protection/Linear Dimming

♦ Thermal-Shutdown Protection

♦ Available in an 8-Pin SO Package

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

MAX16822A/MAX16822B

2MHz, High-Brightness LED Drivers with

Integrated MOSFET and High-Side Current Sense

________________________________________________________________

Maxim Integrated Products

Ordering Information

LXPGND

TEMP_I

DIMIN

GND

MAX16822A

MAX16822B

OFF

HB LEDs

NTC

OPTIONAL

SENSE

Typical Application Circuit

19-4141; Rev 1; 6/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

Denotes a lead-free/RoHS-compliant package.

PART TEMP RANGE

PIN-PACKAGE

MAX16822AASA+

-40°C to +125°C 8 SO

MAX16822BASA+

-40°C to +125°C 8 SO

Pin Configuration appears at end of data sheet.

1 2 3 4 5 6 7 8 9 10

MAX16822A/MAX16822B 1

Resumo do Conteúdo

Página 1 - MAX16822A/MAX16822B

General DescriptionThe MAX16822A/MAX16822B step-down constant-cur-rent high-brightness LED (HB LED) drivers provide acost-effective design solution fo

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MAX16822A/MAX16822B2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current SenseMaxim cannot assume responsibility for use of an

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MAX16822A/MAX16822B2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense2 ______________________________________________

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MAX16822A/MAX16822B2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense________________________________________________

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MAX16822A/MAX16822B2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense4 ______________________________________________

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MAX16822A/MAX16822B2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense________________________________________________

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MAX16822A/MAX16822B2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense6 ______________________________________________

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Undervoltage Lockout (UVLO)The MAX16822A/MAX16822B include UVLO with500mV hysteresis. The internal MOSFET turns off whenVINfalls below 5.5V to 6.0V.DI

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MAX16822A/MAX16822B2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense8 ______________________________________________

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MAX16822A/MAX16822B2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense________________________________________________

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Rainbow-electronics MAX16822B Manual do Utilizador Página 1

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