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What is the benefit of XDPL8221 primary side regulation (PSR)?

What is the benefit of XDPL8221 primary side regulation (PSR)?

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The XDPL8221 PSR supports the LED driver design with an output operating window, consisting of three types of control schemes: Constant Voltage (CV), Constant Current (CC) or Limited Power (LP) mode. The accurate CV, CC and LP set-point control eliminates a secondary-side feedback loop for cost savings, while providing a high degree of flexibility with the digitally configurable output operating window.

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