LNK6768E

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The LNK6768E is a linear regulator controllers that offer low-noise, high- efficiency, and thin form-factor for both offline and online AC/DC applications. It is optimized for .75 to 5V output in buck and boost configurations. In addition, it includes active current limit, dynamic voltage scaling, and advanced Features Protections.

The LNK6768E is well-suited for bridge & single-ended (non-isolated) DC/DC applications such as ac-dc wall adapters, dc-dc post-regulators, 5V/12V standby, and industrial applications that require pre-regulator maintenance and make significant use of indirect or self-generated feedback.

As a linear-regulator controller, it is designed to minimize switching loss and minimize the size of the external components, using a current management approach. Commonly referred to as switched-mode current regulation technique, the controllers maintain a constant output DC level by using a combination of inductive and resistive elements placed in series with the output. The principle of operation is based on a feedback loop which monitors the current flowing through the series elements, and adjusts the switch duty cycle accordingly.

A comparison between the operating efficiency of linear-regulator converters and switch-mode converters is important, as the first type is by far the most efficient solution for low output levels in the range <5V ~500mA. The switch-mode solution, on the other hand, is more efficient with higher output and load current requirements, because of its reduced heat dissipation and smaller size. The LNK6768E allows for a seamless transition between linear- and switch-mode regulation, allowing for lower cost and more compact designs.

The linear-regulator controller offers numerous features and benefits, such as:

• High efficiency at low output levels, up to 96% with an operating temperature up to 100°C
• Advanced overvoltage and overcurrent protection, enabling continuous operations in case of faults
• Low current standby mode, with no load current as low as 0.1mA
• Frequency dithering to reduce EMI emissions, and selectable switching frequency between 70kHz and 500kHz
• Dynamic voltage scaling, to automatically adjust the output voltage for different load conditions

In conclusion, the LNK6768E is a linear-regulator controller suitable for a wide range of AC/DC applications that require precise voltage regulation and low power consumption. Its numerous features and benefits, coupled with its highly-efficient operation, make it a great choice for engineers designing power supplies, bridges, and AC/DC wall adapters. With its low EMI noise and high-efficiency output, the LNK6768E can provide the desired performance and reliability, even in the toughest operating conditions.

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