UC3856NG4

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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UC3856NG4 Application Field and Working Principle

UC3856NG4 is a member of the UC38xx (UC38xxN) two-terminal step-down current-mode PWM controller family. It is built with a CMOS technology and is optimized for off-line SMPS. The current-mode control scheme provides fast transient response and ease of loop stabilization. The UC3856NG4 is available in a 5-pin TO-220 package.

Application Field:

UC3856NG4 is an integrated circuit developed for the purpose of current-mode PWM control. It is widely used in switching power supply applications such as AC/DC converter, DC/DC converter, offline SMPS, and lightning protection relays.

Working Principle:

UC3856NG4 employs a current-mode control scheme for fast transient response and easy loop stabilization. It is designed with a complete protection circuitry that prevents faults from happening in the output circuit, and helps the applications to operate safely. The device is built with a CMOS technology which minimizes the power dissipation and consumes low quiescent current.The current-mode control mode used by UC3856NG4 works by monitoring the current that is going through the power switch and generating a control signal based on the level of current. When the current increases above the reference level, the PWM signal will be reduced such that the power switch turns off. When the current decreases below the reference level, the PWM signal will be increased such that the power switch turns on. The duty cycle of the PWM signal is set such that the output voltage remain constant.When operating in current-mode control, UC3856NG4 features under-voltage lockout to allow for switching turn on, over-voltage protection to prevent excessive current from damaging the circuit, as well as over-temperature protection so that the circuit shut down during high temperature operation. The device also includes an external gate-drive circuitry which helps to reduce the complexity of the output circuit.In summary, UC3856NG4 is a two-terminal, step-down current-mode PWM controller, suitable for offline SMPS and various switching power supply applications. It offers fast current-mode control with robust protection circuitry.

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