LNK305GN-TL Integrated Circuits (ICs)

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The LNK305GN-TL is a low-cost high-performance off-line Quasi-Resonant Flyback current-mode PWM IC. This device is especially suited for topologies such as High-Voltage Transformer-based DC-DC converters, Adapter and Battery Chargers, Offline Switcher applications and other systems that may require high power levels. The LNK305GN-TL offers a wide range of features resulting in superior performance, in a very small package for both new designs and design replacements.

The LNK305GN-TL integrates a Peak Current Mode control with Constant-off Time for cycle-by-cycle current limiting protection and over-temperature protection (OTP), making it an ideal AC-DC converter. The device has an Internal Slope-Compensation circuit to provide superior load regulation and fast transient response. The Quasi-Resonant Operation mode not only reduces switching losses, but maintains a low EMI profile while supporting a wide variety of power levels. The LNK305GN-TL supports Random Frequency Operation with its built-in Load-Adaptive Constant-off Time to reduce switching harmonic content and extend system performance.

The LNK305GN-TL supports single-ended Synchronous Rectifier mode, which combined with a Novel Synchronized-Turn-off mechanism, allows forTransformer size reduction, higher efficiency and improved power conversion performance. The device also supports non-dissipative over-current protection and a specialized input voltage under-voltage lockout (UVLO) scheme, making it an ideal candidate for cost-sensitive offline/non-isolated converter applications.

The LNK305GN-TL working principle is simple and easy to understand. When an AC power source is connected to the device, it senses the input voltage and current, and the internal slope compensation then adjusts its output power level accordingly. The device also incorporates a special Pulse-Skip modulation mode, which allows it to reduce its internal power consumption and reduce the output voltage ripple. When the input voltage or current reaches its limit, the device automatically switches into a low-power standby mode, ensuring that the system operates at its optimal efficiency.

The LNK305GN-TL are targeted for a wide range of applications, such as AC-DC adapter chargers, battery chargers, non-isolated DC/DC converters, offline switchers and other high power related applications. It is available in an 8-lead SOIC package, making it an ideal component for compact and space-constrained designs. The device is designed to provide enhanced performance, low-cost and high-efficiency power solutions.

The superior performance of the LNK305GN-TL lies in its sophisticated built-in protection circuits, making it a preferred choice for AC-DC adapter, battery charger and offline switcher applications. It has on-board temperature sensor to generate over-temperature shutdown that prevents the device from being damaged due to excessive temperature rises. It also uses a cycle-by-cycle current-limiting scheme to protect the design from unexpected overcurrent conditions. This feature makes the LNK305GN-TL an ideal choice for AC-DC converter solutions.

The LNK305GN-TL has a wide operating temperature range of -20°C to +85°C, making it suitable for a wide variety of AC-DC converter applications and operating environments. This device also features an ultra-wide input voltage range of 88VAC to 264VAC, with no external component required, making it an ideal solution for cost-sensitive basic isolated and non-isolated applications. The device is also rated for overvoltage protection, making it suitable for operating in environments prone to high line surges and transients.

Overall, the LNK305GN-TL is an ideal choice for AC-DC converters, offline switchers and other similar applications that require reliable high power solutions. Its low-cost and high efficiency make it an appealing product for the cost-conscious consumer. Its versatile features and protection circuits make it the device of choice in many harsh and hazardous environments, while its wide operating temperature range makes it suitable for a wide range of applications.

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