UCC38C41DGK

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UCC38C41DGK Application Field and Working Principle

The UCC38C41DGK are high performance offline switcher ICs for use as offline power supply controllers in numerous distributed power applications, such as highly integrated adapters, desktop and portable systems. This switching controller is based on the biCMOS process which is particularly suitable for high efficiency and low cost offline all but the most sensitive operation. The device operates with an input voltage range from 85V to 265V, so that the primary side power supply components can be shared across many different applications. The gate driver output works with an external MOSFET for power switches for standby power, allowing for higher efficiency, compact size and robustness than equivalent designs equipped with BJTs.

Features

• Compatible with multiple types of MOSFET voltage, current mode transition control
• Integrated (i.e. no opto-isolator) and TTL compatible pulse width modulation (PWM) and peak current mode control
• Frequency modulation-free circuitry
• System includes overvoltage protection and error amplifier
• Integrated top-of-the-line bootstrap (Booster) circuit
• Ready-to-use auto-restart protection system

Applications

• High-integrated adapter
• Desktop power/DV/DC power
• Portable equipment, telephone booth provided
• Low power PC
• Power adapters

Operating Principle

The UCC38C41DGK is mainly composed of circuits such as pulse width modulation (PWM) sensing, error amplifier, output echo and remittance circuit, oscillator, start-up circuit and protection circuit. The circuit can detect the output voltage and adjust the output current following varying load conditions. The operating principle of the UCC38C41DGK is based on the principle of high current driver, where when the PWM signal is high, it means that the MOSFET switch is ON, and when it is low, the switch is OFF. The output voltage of the power circuit is regulated by the error amplifier, which will compare the feedback voltage and the reference voltage, and output an error signal that is used to regulate the pulse width of the PWM signal. In this way, the error amplifier can maintain a constant output voltage, which is independent of load variation.

Conclusion

The UCC38C41DGK are excellent choices for high performance offline switcher IC applications, offering high efficiency, small size, robustness and compatibility with multiple types of MOSFETs. With their integrated functions, they are a great choice for desktop and portable systems, adapters and low power PCs. The operating principle is based on the high current driver, providing for a well regulated power supply that is independent of load variation.

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