LNK6767V

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LNK6767V, an LED-driver integrated circuit from Power Integrations, is a high-performance AC/DC PWM (pulse-width-modulated) converter for LED lighting applications. It provides the required level of performance, robustness, and efficiency to achieve the advantages of durable and energy-efficient LED lighting.

The LNK6767V features a wide range of features that improve system performance, including the patented TOPSwitch-JX high-frequency, low-noise step-down converter, a low-voltage boost DC/DC converter with selectable output voltage ranges, dynamic peak current control, and an adjustable switch-off voltage with minimum ripple. It also includes protection against open/short-circuit, over-temperature, over-voltage and minimum input-voltage conditions.

The main application field of the LNK6767V is LED lighting, particularly for tubes and power supplies for other loads at mains voltages. It consists of two main parts: a high-frequency switched-mode power converter and a MOSFET power switch. This is integrated in a single IC, which simplifies the design of a high-efficiency LED lighting system. It is capable of delivering up to 90W at an output of 48V, with a wide input voltage range of 85-305VAC or 127-432VDC.

The working principle of the LNK6767V follows that of the standard PWM converter. It converts an unregulated AC or DC input voltage to a regulated DC output voltage, generating relatively low output noise. The primary AC or DC input voltage is converted to a square-wave bipolar PWM signal. This signal is used to control the MOSFET switching in the converter. The on-time and off-time of the MOSFET power switch control the regulated output voltage.

The LE and BOOST pins drive the internal MOSFET power switch, turning it on and off at specific frequencies to provide the desired output voltage. An external soft-start capacitor helps to reduce inrush current. The dynamic peak current-control feature increases the efficiency of the converter and reduce the need for a bulky heat sink.

The LNK6767V also provides a number of protection features, such as open and short circuit protection, over-temperature protection, over-voltage protection, and a minimum input voltage selector. These features protect the converter from various internal and external faults, improving system reliability and reducing the need for extra protective circuitry.

Overall, the LNK6767V is a highly efficient, integrated DC/DC PWM converter, suitable for powering LED lighting systems. The wide input voltage range, dynamic peak current-control, and protection features make it an ideal choice for designers looking for reliable, energy-efficient LED lighting applications.

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