onsemi KA5H0380RTU: A High-Performance Off-Line Switching Power Supply Solution

The onsemi KA5H0380RTU represents a highly integrated power switcher IC designed specifically for off-line switching power supply applications. This device combines a high-voltage power MOSFET with a current-mode PWM controller in a single TO-220F package, offering a compact and efficient solution for auxiliary power supplies in consumer electronics, appliances, and industrial systems.

Engineered for robustness, the KA5H0380RTU operates with a fixed switching frequency of 100 kHz, which optimizes performance while minimizing electromagnetic interference (EMI). Its current-mode control architecture ensures excellent line and load regulation, simplifying feedback loop design and enhancing transient response. The integrated 800V avalanche-rugged MOSFET provides superior durability against voltage spikes commonly encountered in off-line environments, significantly improving system reliability.

Key features include built-in soft-start to reduce inrush current during startup, cycle-by-cycle current limiting for overload protection, and an under-voltage lockout (UVLO) function that ensures stable operation within the specified voltage range. The device’s low operating current in startup and standby modes makes it particularly suitable for energy-efficient designs compliant with global energy standards.

With its minimal external component count and high level of integration, the KA5H0380RTU reduces both design complexity and overall system cost. It is an ideal choice for designers seeking a reliable, high-performance switcher for flyback converters in power adapters, LED drivers, and home appliance power modules.

ICGOODFIND: The onsemi KA5H0380RTU integrates a high-voltage MOSFET and PWM controller, delivering a reliable, efficient, and cost-effective solution for off-line power supplies.

Keywords:

Switching Power Supply

Current-Mode PWM

Integrated MOSFET

Off-Line Converter

High Reliability