LNK3604G-TL

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The LNK3604G-TL is an integrated monolithic power controller targeted at AC/DC energy conversion applications in a variety of end-use products. It is designed to provide high performance and low external component count for offline power supply designs. The LNK3604G-TL features startup current, adjustable current limiting, simple thermal protection, and open loop voltage clamping in its protection feature set. It is suitable for applications such as portable products, home appliances, lighting, and industrial electronics.

The LNK3604G-TL is designed to be used as a low-cost, high performance analogue integrated circuit for offline switched-mode power supplies. It is a single stage, quasi-resonant design with a patented integrated flyback topology. This topology uses a quasi-resonant switch to deliver power with low audible noise, improved energy efficiency, and low cost. It also has an adjustable current limit which ensures modest protection in applications with varying line voltages and provides a consistent performance over the full line voltage range. In addition, the quasi-resonant switch provides a fast response time to ensure low power loss and low system cost. This controller is also equipped with a soft-start circuit which prevents large inrush currents and allows the controller to gradually increase its average power output in a controlled manner.

In terms of its working principle, the LNK3604G-TL uses a primary switch, typically a MOSFET, to control a flyback type AC/DC converter. The primary switch provides a pulse width modulated (PWM) waveform to the transformer primary side which induces current into the transformer\'s secondary side winding. The output of the secondary winding is rectified and fed to the output capacitor filter circuit, which produces the desired DC output voltage. The primary switch is controlled by an internal error amplifier, which compares a sample of the output voltage to a feedback reference. This error amplifier drives an internal oscillator, which provides a sinusoidal waveform to the primary switch. By carefully controlling the duty cycle of this waveform, the average output power can be controlled, giving the controller its power management capability. The frequency of the waveform is adjusted in order to maintain the desired output voltage. This method of operation is highly efficient, as the controller minimizes power dissipation by dynamically adjusting its operating frequency in order to accommodate the load.

In summary, the LNK3604G-TL enables high efficiency and low cost AC/DC power conversion by providing stable power and noise performance. Its built-in current limit and open loop voltage protection provide excellent system protection. Its primary switch controller is designed to minimize power losses and provide a soft-start capability. Together, these features make it an ideal choice for a variety of end-use products which require low cost, high performance AC/DC power conversion.

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