Rainbow-electronics MAX16832C Instrukcja Użytkownika Pobierz pdf

General Description

The MAX16832A/MAX16832C 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 MAX16832A/MAX16832C operate from a +6.5V to

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

resistor adjusts the output current up to 700mA, 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 MAX16832A allows 10% current ripple, and

the MAX16832C allows 30% current ripple. Both

devices operate up to a 2MHz switching frequency,

thus allowing the use of small-sized components.

The MAX16832A/MAX16832C 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. Additional features

include thermal-shutdown protection.

The MAX16832A/MAX16832C operate over the -40°C to

+125°C automotive temperature range and are available

in a thermally enhanced 8-pin SO package.

Applications

Architectural, Industrial, and Ambient Lighting

Automotive RCL, DRL, and Fog Lights

Heads-Up Displays

Indicator and Emergency Lighting

MR16 and MR111 LED Lights

Features

o High-Efficiency Solution

o 6.5V to 65V Input Voltage Range

o On-Board 65V, 0.45Ω Power MOSFET

o Hysteretic Control: Up to 2MHz Switching

Frequency

o ±3% LED Current Accuracy

o 200mV Current-Sense Reference

o Resistor-Programmable Constant LED Current

o Integrated High-Side Current Sense

o Thermal-Foldback Protection/Linear Dimming

o Thermal-Shutdown Protection

o Available in a Thermally Enhanced 8-Pin SO

Package

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

MAX16832A/MAX16832C

2MHz, High-Brightness LED Drivers with

Integrated MOSFET and High-Side Current Sense

________________________________________________________________

Maxim Integrated Products

Ordering Information

LXPGND

TEMP_I

DIMIN

GND

MAX16832A

MAX16832C

OFF

HB LEDs

NTC

OPTIONAL

SENSE

Typical Application Circuit

19-4140; Rev 0; 5/08

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.

Denotes a lead-free package.

Future product—contact factory for availability.

EP = Exposed pad.

PART TEMP RANGE

PIN-PACKAGE

MAX16832AASA+ -40°C to +125°C 8 SO-EP**

MAX16832CASA+*

-40°C to +125°C 8 SO-EP**

Pin Configuration appears at end of data sheet.

1 2 3 4 5 6 7 8 9

MAX16832A/MAX16832C 1

Podsumowanie treści

Strona 1 - MAX16832A/MAX16832C

General DescriptionThe MAX16832A/MAX16832C step-down constant-cur-rent high-brightness LED (HB LED) drivers provide acost-effective design solution fo

Strona 2

MAX16832A/MAX16832C2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense2 ______________________________________________

Strona 3

MAX16832A/MAX16832C2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense________________________________________________

Strona 4

MAX16832A/MAX16832C2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense4 ______________________________________________

Strona 5

MAX16832A/MAX16832C2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense________________________________________________

Strona 6

MAX16832A/MAX16832C2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense6 ______________________________________________

Strona 7

Undervoltage Lockout (UVLO)The MAX16832A/MAX16832C include a UVLO with500mV hysteresis. The internal MOSFET turns off whenVINfalls below 5.5V to 6.0V.

Strona 8

MAX16832A/MAX16832C2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current Sense8 ______________________________________________

Strona 9

MAX16832A/MAX16832C2MHz, High-Brightness LED Drivers withIntegrated MOSFET and High-Side Current SenseMaxim cannot assume responsibility for use of an

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