UC3856N

Frequency - Switching:	200kHz
Base Part Number:	UC3856
Supplier Device Package:	16-PDIP
Package / Case:	16-DIP (0.300", 7.62mm)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	47%
Series:	--
Voltage - Supply (Vcc/Vdd):	7 V ~ 40 V
Output Phases:	1
Number of Outputs:	2
Topology:	Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Output Configuration:	Positive
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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UC3856N is an improved version of the UC3854 “High Power Factor PWM Controller”. It is a high-performance, high-power-factor, switcher controller which is specially designed for current-mode switching voltage regulator applications such as a switched-mode power supply (SMPS).The UC3856N is a high-performance, high-power-factor, switcher controller that can be used to control multiple switched mode power supplies. It provides a wide range of adjustable settings for output voltage, current, and frequency, allowing for high flexibility and efficiencies. Its precision current-mode PWM provides high loop stability and excellent transient response.

Overview

The UC3856N is ideal for switchmode power supplies which require excellent line and load regulation, fast transient response and low input current distortion. It offers excellent protection features such as under voltage lock out (UVLO), overcurrent protection (OCP), and overvoltage protection (OVP) to ensure device reliability. Furthermore, the UC3856N also offers a high degree of flexibility and control. It includes features such as slope compensation, cycle-by-cycle current limiting, and soft start. This allows for a wide range of applications, from simple inductive buck converters to advanced, high-frequency resonant converters.

Application Field

High-quality switchmode power supplies and LED drivers are just a few of the applications that the UC3856N can be used for. Other possible applications include motor control, server/storage and battery charging. The UC3856N is well suited for any applications that require high current, high efficiency, and low noise switching power supplies. It is also suitable for high power factor applications, where the controller can help minimize input harmonic distortion. With its adjustable output voltage, current, and frequency, the UC3856N is an ideal solution for different types of power modules and power converters.

Working Principle

The UC3856N utilizes a current-mode pulse-width modulation (PWM) system in order to control the output voltage. This PWM system senses the input and output voltages, and then adjusts the duty cycle to maintain the desired output. Once the duty cycle reaches the upper or lower limits, the UC3856N will switch off the converter and re-adjust the pulse width and duty cycle accordingly. The UC3856N can be configured to operate in either boost or buck mode, allowing for a wide range of power supply design possibilities. The controller also has a wide range of adjustable settings for output voltage, current, and frequency, allowing for flexible design and allowing for maximized power efficiency and accuracy. The UC3856N also has built-in protection features such as under voltage lock out (UVLO), overvoltage protection (OVP), overcurrent protection (OCP), and soft-start control, which allow for reliable and safe operation. Overall, the UC3856N is a versatile, high-performance, high-power-factor switcher controller that offers high flexibility and efficiency. It is ideal for switchmode power supplies and LED drivers, motor control, server/storage, battery charging, and other applications that require accurate and reliable current-mode PWM.

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