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

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

Product Details

Key Features

Simplified Block Diagram

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Key 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

Applications/Uses

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

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 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.

Simplified Block Diagram

MAX16801A/B, MAX16802A/B: Typical Operating Circuit MAX16801A/B, MAX16802A/B: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .