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UC3842BNG

The UC3842BNG is a high-voltage, high-current, fixed frequency, current-mode PWM controller designed for offline switch mode power supply applications. It is manufactured by ON Semiconductor.

Description:

The UC3842BNG is a monolithic integrated circuit that provides all the features required for a current-mode PWM controller. It includes an error amplifier, a pulse width modulator, an oscillator, a dead time controller, and protection circuits. The device is available in a thermally enhanced SO-8 package.

Features:

1. Fixed 50kHz switching frequency
2. Current-mode control for fast transient response and easy loop compensation
3. High-voltage startup with under-voltage lockout
4. Over-current protection with cycle-by-cycle current limiting
5. Thermal shutdown protection
6. Soft-start function to reduce inrush current
7. Push-pull output stage with totem-pole structure for high efficiency
8. Synchronous rectification for improved efficiency in low-voltage applications
9. Wide operating voltage range from 4.5V to 40V

Applications:

The UC3842BNG is suitable for a wide range of offline switch mode power supply applications, including:

1. Desktop and laptop computer power supplies
2. Telecommunications power supplies
3. Industrial power supplies
4. LED lighting power supplies
5. Battery chargers
6. DC-DC converters
7. Uninterruptible power supply (UPS) systems

The UC3842BNG is a versatile and reliable choice for designers looking to implement a high-performance power supply solution. Its fixed frequency operation and current-mode control make it easy to design and implement, while its wide operating voltage range and robust protection features ensure reliable operation over a variety of input and output conditions.