LX27901ID |
Product Status
In Production |
Overview
The LX27901 is an extremely versatile high-performance controller for driving LEDs from the HVDC (output) rail of a standard PFC front-end. The controller allows the user to utilize three different converter drive schemes, LLC (resonant), conventional PWM control, and Microsemi’s proprietary synchronous scheme, all selectable by the multi-function ENABLE pin. In non-resonant mode, the controller provides two 180° phase-shifted pulse-width modulated drive signals for implementing various two-switch DC-DC converter topologies, such a half-bridge and asymmetrical forward converter. It can also be used for one-switch topologies. Direct PWM input dimming operation can be realized by inputting a suitable dimming pulse train to the DIM pin. The LX27901 supports analog LED current control utilizing the BRTA pin for setting the analog LED current. In addition, a proprietary dimming algorithm ACU_BRITE® is incorporated. The controller integrates the pulsed LED current and compares it with a reference for very accurate brightness control irrespective of duty cycle. The LX27901 is designed to operate with Microsemi’s proprietary lossless (magnetic) current balancing schemes. See more at ![]() Features
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Package Carrier: | Tube |
Electrical Rating | Symbol | Min | Typ | Max | Unit |
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Input Voltage | Vin |
7.5 | 27 | VDC | |
Quiescent Current | IQ | 200 | 400 | µA |
Resources
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