MAX16802BEVKIT【PDF 1/16 页】EVAL KIT FOR MAX16802

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19-3880; Rev 2; 1/10

ATION

EVALU

AVAIL

KIT

ABLE

Offline and DC-DC PWM Controllers for

High-Brightness LED Drivers

General Description

The MAX16801A/B/MAX16802A/B high-brightness (HB)

LED driver-control ICs contain all the circuitry required

for the design of wide-input-voltage-range LED drivers

for general lighting and display applications. The

MAX16801 is well suited for universal input (rectified

85VAC to 265VAC) LED drivers, while the MAX16802 is

intended for low-input-voltage (10.8VDC to 24VDC) LED

drivers.

When the LED current needs to be tightly regulated, an

additional on-board error amplifier with 1% accurate ref-

erence can be utilized. A wide dimming range can be

implemented by using low-frequency PWM dimming.

The MAX16801/MAX16802 feature an input undervoltage

lockout (UVLO) for programming the input-supply start

voltage, and to ensure proper operation during brownout

conditions. The MAX16801 has an internal-bootstrap

undervoltage lockout circuit with a large hysteresis that

simplifies offline LED driver designs. The MAX16802 does

not have this internal bootstrap circuit and can be biased

directly from a +12V rail.

The 262kHz fixed switching frequency is internally

trimmed, allowing for optimization of the magnetic and fil-

ter components, resulting in a compact, cost-effective

LED driver. The MAX16801A/MAX16802A are offered with

50% maximum duty cycle. The MAX16801B/MAX16802B

are offered with 75% maximum duty cycle. These devices

are available in an 8-pin μMAX ? package and operate

Features

? Suitable for Buck, Boost, Flyback, SEPIC, and

Other Topologies

? Up to 50W or Higher Output Power

? Universal Offline Input Voltage Range: Rectified

85VAC to 265VAC (MAX16801)

? IN Pin Directly Driven From 10.8VDC to 24VDC

Input (MAX16802)

? Internal Error Amplifier with 1% Accurate

Reference for Precise LED Current Regulation

? PWM or Linear Dimming

? Fixed Switching Frequency of 262kHz ±12%

? Thermal Shutdown

? Digital Soft-Start

? Programmable Input Startup Voltage

? Internal Bootstrap UVLO with Large Hysteresis

(MAX16801)

? 45μA (typ) Startup Supply Current, 1.4mA (typ)

Operating Supply Current

? 50% (MAX16801A/MAX16802A) or 75%

(MAX16801B/MAX16802B) Maximum Duty Cycle

? Available in a Tiny 8-Pin μMAX Package

Ordering Information

over the -40°C to +85°C temperature range.

Applications

Offline and DC-DC LED Commercial and

Drivers Industrial Lighting

PART

MAX16801 AEUA+

MAX16801BEUA+

TEMP

RANGE

-40°C to +85°C

PIN-

PACKAGE

8 μMAX

RGB Back Light for LCD

TVs and Monitors

Decorative and

Architectural Lighting

MAX16802 AEUA+

MAX16802BEUA+

-40°C to +85°C

8 μMAX

+ Denotes lead-free package.

μMAX is a registered trademark of Maxim Integrated Products, Inc.

10.8VDC TO 24VDC

Typical Operating Circuit

PWM

ENABLE

UVLO/EN

DIM/FB

V CC

LEDs

MAX16802B

COMP

NDRV

GND

Warning: The MAX16801/MAX16802 are designed to work with high voltages. Exercise caution.

________________________________________________________________ Maxim Integrated Products

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.

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