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MAX16831 - High-Power LED Driver

Description

The MAX16831 is a current-mode, high-brightness LED (HBLED) driver designed to control two external n-channel MOSFETs for the single-string LED current regulation.

The MAX16831 integrates all the building blocks necessary to implement fixed-frequency HBLED drivers with wide-range dimming control.

Features

  • o Wide Input Range: 6V to 76V With Cold-Start Operation to 5.5V o Integrated Differential LED Current-Sense Amplifier o Floating Dimming Driver Capable of Driving an n-Channel MOSFET o 5% LED Current Accuracy o 200Hz On-Board Ramp Syncs to External PWM Dimming Signal o Programmable Switching Frequency (125kHz to 600kHz) and Synchronization o Output Overvoltage Load Dump, LED Short, Overtemperature Protection o Low 107mV LED Current Sense for High Efficiency o Enable/Shutdown Input with Shutdown.

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Full PDF Text Transcription

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19-0809; Rev 0; 4/07 High-Voltage, High-Power LED Driver with Analog and PWM Dimming Control General Description The MAX16831 is a current-mode, high-brightness LED (HBLED) driver designed to control two external n-channel MOSFETs for the single-string LED current regulation. The MAX16831 integrates all the building blocks necessary to implement fixed-frequency HBLED drivers with wide-range dimming control. The MAX16831 is configurable to operate as a step-down (buck), step-up (boost), or step-up/-down (buck-boost) current regulator. Current-mode control with leading-edge blanking simplifies control-loop design. Internal slope compensation stabilizes the current loop when operating at duty cycles above 50%.
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