UC3901DTRG4

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

UC3901DTRG4 Application Field and Working Principle

The UC3901DTRG4 is a current-mode pulse-width modulation (PWM) control IC designed to operate both isolated and non-isolated DC/DC power supplies. It is designed to regulate the output voltage of a single-ended or a half-bridge forward converter, or a quasi-resonant zero-voltage-switching flyback converter. It boasts a wide range of features and is capable of operating at high-frequency in either an isolated or non-isolated configuration.

Characteristics

The main features of the UC3901DTRG4 include:

• Output current limitation
• Adjustable over-current protection
• Current-mode control
• Input voltage range of up to 72 V
• Programmable frequency up to 2 MHz
• Thermal shutdown protection
• Input voltage threshold protection

Application Fields

The UC3901DTRG4 is designed for use in automotive, industrial, telecommunications, consumer, and computer applications. In these applications, it is often used to provide an isolated voltage supply from an non-isolated input, or vice versa, to achieve voltage regulation and/or impedance matching.

Working Principle

The UC3901DTRG4 uses a pulse-width modulation (PFM) technique to regulate the output voltage of an isolated or non-isolated DC/DC power supply. The PWM technique is based on the principle of comparing the output voltage, set by an adjustable internal reference, to an external feedback voltage, in this case the output voltage. The comparison results in an output voltage error signal, which is used to regulate the duty cycle of the PWM signal. This duty cycle is then used to control the switching of the power switch, as well as provide feedback to the main control loop. The UC3901DTRG4 is capable of operating in either continuous or discontinuous conduction mode and provides a maximum frequency of 2 MHz.

Conclusion

The UC3901DTRG4 is a current-mode PWM control IC designed for use in a wide range of applications such as automotive, industrial, telecommunications, consumer, and computer. It is ideal for regulating the output voltage of isolated or non-isolated DC/DC power supplies, up to a maximum frequency of 2 MHz and programmable frequency up to 2 MHz. Furthermore, the IC features overcurrent protection, thermal shutdown protection, and input voltage threshold protection.

The specific data is subject to PDF, and the above content is for reference