PFET Buck Controller for High Power LED Drives
Estimated Delivery Time: Jun 22 - Jun 27 days (choose Expedited at checkout).
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The LM3409 are P-channel MOSFET (PFET) controllers for step-down (buck) current regulators which are ideal for driving LED loads.
They have wide input voltage range allowing for regulation of a variety of LED loads.
The high-side differential current sense, with low adjustable threshold voltage, provides an excellent method for regulating output current while maintaining high system efficiency.
The LM3409 uses a Controlled Off-Time (COFT) architecture that allows the converter to be operated in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) with no external control loop compensation, while providing an inherent cycle-by-cycle current limit.
The adjustable current sense threshold provides the capability to amplitude (analog) dim the LED current over the full range and the fast output enable/disable function allows for high frequency PWM dimming using no external components.
When designing, the maximum attainable LED current is not internally limited because the LM3409 is a controller. Instead it is a function of the system operating point, component choices, and switching frequency allowing the LM3409 to easily provide constant currents up to 5A. This simple controller contains all the features necessary to implement a high-efficiency versatile LED drive.
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