MAX16801A

Offline and DC-DC PWM Controllers for High-Brightness LED Drivers

LED Driver Solution with Wide Range of Operation and High-Current Accuracy

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Overview

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

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

Applications

Commercial and Industrial Lighting
Decorative and Architectural Lighting
Offline and DC-DC LED Drivers
RGB Back Light for LCD TVs and Monitors

Documentation

Data Sheet 1

MAX16801-MAX16802B: Offline and DC-DC PWM Controllers for High-Brightness LED Drivers Data Sheet (Rev.2) 04/01/2010

Technical Articles 1

Design of a Nonisolated, Flyback LED Driver Circuit 02/20/2023

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX16802B

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Features and Benefits

10.8V to 30V Wide Supply Voltage Range

Current-Controlled Output

Up to 750mA LED Current at 12V Output

Linear and PWM Dimming Control

Over 80% Efficiency at Full Load

Supply Undervoltage Lockout

Output Overvoltage Protection

Product Details

The MAX16802B evaluation kit (EV kit) demonstrates a current-controlled, high-output-current LED driver based on the MAX16802B. This EV kit is capable of supplying stable output currents of up to 750mA, can run at supply voltages between 10.8V and 30V, and can operate at temperatures ranging from -40°C to +85°C.

The MAX16802B EV kit features two different types of dimming controls using either a linear input voltage or a PWM input signal to control the LED brightness. This EV kit also has a UVLO feature to turn off the EV kit operation during low input supply voltage and an overvoltage protection to protect the EV kit under an open-LED condition. The MAX16802B EV kit is a fully assembled and tested board.

Warning: Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this EV kit with care to avoid possible personal injury.