MIC4833YML-TR

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The MIC4833YML-TR is a high-voltage integrated lighting controller with a high-voltage open-drain output for inductive load applications, such as lamp ballast. This device integrates a Pulse Width Modulation (PWM) controller, current-sense amplifier, with hysteretic control, and is designed to provide a direct control of the leading edge dimming ballast. The device is intended to offer a simple yet highly efficient lighting solution with flexible brightness control.

The MIC4833YML-TR offers a wide range of application advantages, including accurate PWM dimming, long dimming range, low standby losses and improved efficiency over its predecessor the MIC4830. The voltage regulation range of the MIC4833YML-TR is from 1.2 V to 14 V, and the peak output current is up to 550 mA. The dimming range of the controller is up to 20 kHz. The output voltage accuracy is 1.5% and the typical output ripple is 25mV.

The device works through detecting the short circuit current and turns off the triac after a certain time period, thus controlling the lumens emitted by the lamp. The input voltage is sensed by the current-sense amplifier and compared with the internal reference voltage. The time period for which the trigger signal is pulsed is directly proportional to the voltage difference between the two levels. This pulse width modulation achieves the desired dimming control.

The MIC4833YML-TR is ideal for applications such as dimmer switches, street-lights, decorative and specialized lighting systems. Additional features such as Open Load Detection and Zero Droop Compensation functions make the device a reliable and cost-effective solution with improved system stability. The device is available in through-hole and surface mount packages, making it ideal for a wide range of lighting applications.

In summary, the MIC4833YML-TR is a high-voltage lighting controller which integrates a PWM controller, current-sense amplifier and hysteretic control for accurate dimming of ballast lamps. The device offers a simple, efficient and cost-effective solution with improved system stability for numerous lighting applications.

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