MAX16820ATTT中文資料美信數(shù)據(jù)手冊PDF規(guī)格書

General Description

The MAX16819/MAX16820, step-down constant-current high-brightness LED (HB LED) drivers provide a cost effective solution for automotive interior/exterior lighting, architectural and ambient lighting, LED bulbs such as MR16 and other LED illumination applications.

The MAX16819/MAX16820 operate from a 4.5V to 28V input voltage range and feature a 5V/10mA on-board regulator. A high-side current-sense resistor adjusts the output current and a dedicated PWM input (DIM) enables a wide range of pulsed dimming.

The MAX16819/MAX16820 are well suited for applications requiring a wide input voltage range. The high-side current-sensing and an integrated current-setting circuitry minimize the number of external components while delivering an LED current with ±5 accuracy. A hysteretic control algorithm ensures excellent input-supply rejection and fast response during load transients and PWM dimming. The MAX16819 features a 30 inductor current ripple and the MAX16820 features a 10 current ripple. These devices operate up to 2MHz switching fre quency, thus allowing for small component size.

Features

? High-Side Current Sense

? Dedicated Dimming Control Input

? 20kHz Maximum Dimming Efficiency

? Hysteretic Control: No Compensation

? Up to 2MHz Switching Frequency

? ±5 LED Current Accuracy

? Adjustable Constant LED Current

? 4.5V to 28V Input Voltage Range

? Over 25W Output Power

? 5V, 10mA On-Board Regulator

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

Applications

? Architectural, Industrial, and Ambient Lighting

? Automotive RCL, DRL, and Fog Lights

? MR16 and Other LED Bulbs

? Indicators and Emergency Lighting

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