UC3867NG4

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

UC3867NG4 Application Field and Working Principle

The UC3867NG4 is a DC to DC switching controller designed to provide wide, adjustable, power conversion with higher efficiency and lower thermal stress for switching power supplies. Employing a PWM clock with adjustable frequency and programmable slope compensation, optimal regulation performance is achieved even in the mobile environment.

Applications

The UC3867NG4 is suitable for a variety of switching power supplies for the following fields:

• Computers
• Industrial equipment
• Networking
• Miscellaneous consumer electronics

Features

The UC3867NG4 provides a few important features to enhance power supply design and performance:

• Pulse width modulation clock with adjustable frequency
• Programmable peak current-limited power supply ON/OFF control
• Programmable Band Gap Reference (BGR) source to supply VDD power-up sequence
• Programmable pulse slope compensation
• Programmable soft start time
• External compensation connection

Working Principle

The UC3867NG4 works by using pulse-width modulation (PWM) to change the output voltage. PWM works by varying the duty cycle of the on periods, which affects the time the output voltage is in the ON state. The on time is balanced with the off time to create the desired average voltage level. The UC3867NG4 provides internal slope compensation, allowing for more precise control over the average output voltage level.

The UC3867NG4 also provides programmable peak current-limit control, to help protect the power supply against excessive current draw. Additionally, it features an adjustable soft-start time, to ramp up the output voltage slowly for improved system stability. The on/off control of the PWM output is provided by the external gate drive connection.

The UC3867NG4 also provides a programmable Band Gap Reference (BGR) source, to provide power-up sequencing. This prevents the power supply from being switched on before other components are properly connected and powered-up. This can be especially important when dealing with the sensitive devices and systems which are common to modern equipment.

The UC3867NG4 is a robust and versatile solution for DC to DC switching power supply designs. With its adjustable PWM clock, programmable current-limit, Band Gap Reference source, and external compensation connection, it is well suited for a variety of applications.

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