LNK409LG

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The LNK409LG from Power Integrations is a low power off line switching regulator and LED driver IC typically used in off-line AC/DC switching power supplies. Its primary function is to provide a regulated DC output voltage from an AC mains input. In addition, this IC includes a secondary output specifically designed for driving high power LEDs. The LNK409LG\'s secondary output allows for direct drive of LEDs without the need for an external current-limiting resistor.

The LNK409LG is designed to operate over a wide input voltage range of 80VAC to 265VAC and a temperature range of -40°C to +105°C. It supports an output of 1.5A with a maximum output voltage of 30V and has protections against open circuit, short circuit and over-temperature conditions. The LNK409LG also features a built-in Pulse Width Modulation (PWM) circuit that provides an adjustable output current and a wide dimming range. The output current is adjustable with an external resistor.

The LNK409LG has separate primary and secondary control inputs. The primary control input is used to control the output voltage of the primary output. The secondary control input is used to control the output current of the secondary output. By controlling the output current, the LNK409LG can provide dimming control of the LEDs. It also supports a wide range of LED configurations. It can be used to drive up to ten series connected LEDs with a supply voltage up to 36V.

The LNK409LG is a highly integrated and cost effective LED driver IC. It includes a number of built-in features which reduce the component count and minimize system cost. The primary output can be used to drive high power resistive, inductive or capacitive loads while the secondary output can be used to drive high power LEDs. The LNK409LG is ideal for external LED drivers used in LED lighting applications such as street lamps, spotlights and panel lights.

The LNK409LG offers several features to optimize the performance and efficiency of LED driver designs. These features include a hysteretic-type current mode control to ensure stable and consistent output current, a built-in current sense amplifier, a high voltage startup circuit, a temperature-controlled thermal shutdown and an adjustable peak current limit circuit. This IC also has an active power factor correction circuit which is able to cancel the leading power factor. In addition, this IC includes protection circuits such as an open-load detection circuit and an over-voltage protection circuit to ensure safe and reliable operation.

The LNK409LG can be used in a wide range of LED driver applications including LED billboards, LED street lamps, LED spotlights and LED panel lights. In these applications, the IC can be used to provide a regulated output current for driving high power LEDs. The hysteretic control scheme together with the adjustable peak current limit, ensure consistent and stable LED current. The current sense amplifier can be used to measure the current in the LED chain and control the output current. The active power factor correction circuit ensures a high power factor and low total harmonic distortion. Lastly, the temperature-sensitive thermal shutdown helps to prevent IC damage due to overheating.

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