LYT2004E

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The LYT2004E Offline Switcher is a low power, high current IC designed for use in offline AC-DC power supplies such as adapters, external power supplies, and battery charger circuits. This device integrates several topologies and features providing reliability, efficiency and low-EMI. The LYT2004E IC is specifically designed for use in universal input voltage range and discontinuous conduction mode flyback primary side regulation applications.

This IC integrates several topologies and features, such as a controller with high performance comparators, an optional high voltage startup circuit, a voltage reference, fast oscillator clock drivers, a programmable over-temperature function, a latch circuit and a current sense amplifier. An extensive command set allows up to 36 parameters to be programmed. The IC is suitable for the offline AC-DC application market.

The LYT2004E is significantly different from other AC-DC converters, offline switchers and linear regulators. The LYT2004E uses a single primary switch, coupled with a transformar with an auxiliary winding for control, to achieve high performance. This makes the IC an integrated solution and helps to achieve high efficiency and low-EMI with minimal external components. As it does not require a linear circuit for regulation, the LYT2004E does not suffer from the efficiency trade-off that is typical for linear regulates.

The LYT2004E works on the principle of primary side regulation (PSR). The PSR is implemented using a dedicated control loop to regulate the output voltage. The device compares the output power against the internal voltage reference, and then uses the difference to adjust the duty cycle of the primary switch. This control circuit is also coupled with a transformer with an auxiliary control winding, which helps to detect and adjust the current, reducing the output ripple and improving the conversion efficiency. The PSR works with both AC and DC mains.

The LYT2004E also provides comprehensive protection features, including short circuit protection and overcurrent protection, to ensure safe operation and enhanced reliability. Additionally, an instantaneous overcurrent protection (IOCP) feature is available to protects secondary circuits from inrush current. The LYT2004E can also detect and react to over-temperature situations to provide safe operations. It can also turn off the main switch in latches to protect from wrong operations.

In conclusion, the LYT2004E is an ideal solution for offline AC-DC applications, offering high performance, low power consumption and protection features in a single IC. It delivers high efficiency and low-EMI through a PSR technique using a transformer. Additionally, it features a wide command set for features for increased flexibility.

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