LNK603DG

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The LNK603DG is a pushed-mode flyback DC/DC converter controller with integrated Green-mode TM operation and multiple features that enhance system performance and ease of design. It is a high-voltage integrated circuit (HVI) designed to drive an external MOSFET to generate isolated DC output from an AC source. The LNK603DG is designed specifically for applications such as AC/DC adapters, isolated DC/DCs, and switching power supplies. It is able to operate in wide input voltage range with zero-crossing control, and can achieve an output power up to 10W.

The input of the LNK603DG is rectified but not regulated. Its input range is 4.5V to 150V, with a typical value of 85V. Its quiescent current is low and its output power is up to 10W. It is highly integrated, with integrated UVLO and OVP protection, integrated green-mode control, and hysteresis temperature control for extended system life. In addition, it has a wide frequency range of 30kHz to 500kHz, allowing for efficient design and power conversion.

The architecture used in the LNK603DG consists of two stages: the driving stage and the sensing stage. In the driving stage, a half-bridge is used to drive an external MOSFET. The MOSFET is driven by a push-pull driver, which is controlled by the current-sense Signal generated in the sensing stage. In the sensing stage, an isolated transformer is used to sense the output current and generate the current-sense signal. The current-sense signal is compared to a reference voltage which is adjustable by an external resistor. The output voltage is adjusted by the feedback signal, which is then compared to the internal error-amplifier.

The LNK603DG features Green-mode(TM) control, a power-saving technology which reduces the peak power consumption of the system by limiting the amount of energy stored in the output capacitor. When the input voltage is low, the peak current is reduced and the peak power is reduced as well. The LNK603DG also has a built-in Internal Soft-Start feature, which limits the inrush current during startup and reduces stress on the system components.

PWM is used to control the output voltage, and the switching frequency is varied dynamically to maximize efficiency. The LNK603DG has a built-in Delay-off Timer for minimum off-time control, and a built-in PFC-loss detector for improved system efficiency. In addition, it supports multiple fault detection, including open-loop and short-circuit protection. With a typical efficiency of up to 90%, the LNK603DG is a highly integrate, high-performance solution to 12V AC/DC applications.

In conclusion, the LNK603DG is a high-voltage, low-power IC designed to provide high-efficiency, low-cost solutions in AC/DC applications such as AC/DC adapters, isolated DC/DCs, and switching power supplies. With a wide input voltage range and integrated power-saving features, the LNK603DG is an ideal choice for low-power, high-efficiency application designs.

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