UC3844BVDR2

Frequency - Switching:	Up to 500kHz
Base Part Number:	UC384*B
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 105°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	48%
Series:	--
Voltage - Supply (Vcc/Vdd):	10 V ~ 36 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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UC3844BVDR2 Application Field and Working Principle

The UC3844BVDR2 is a Pulse Width Modulation (PWM) controller integrated circuit (IC) that is classified as an off-line switching regulator. It has been developed for use in switch mode power supplies (SMPS) in the 4-30W single-output ranges, such as personal computers and set-top boxes. It operates from a wide range of input voltages ranging from 4.0V to 35V and provides improved protection features such as thermal shutdown or fa ilure protection.The UC3844BVDR2 falls under the general category of power management integrated circuits (PMIC) - Voltage Regulators - DC DC Switching Controllers. The purpose of this device is to maximize the performance and efficiency of a switch mode power supply (SMPS) by using Pulse Width Modulation (PWM) control. The device contains all of the necessary circuitry to accurately control the power output of the supply, allowing it to achieve the highest levels of efficiency and power.The UC3844BVDR2 is designed to work in a variety of operating modes. These include Fixed Frequency Mode (FFM) and Variable Frequency Mode (VFM). In FFM, the switching frequency is determined by the external components connected to the device. In VFM, on the other hand, the switching frequency is determined by an internal oscillator circuit. This allows for better control of the power output of the circuit, as well as improved efficiency.The operating principle of the UC3844BVDR2 is relatively straightforward. The device accepts an input voltage, which it uses to generate a pulse width modulated (PWM) signal. This signal is then used to drive a power transistor, which in turn controls the output voltage of the circuit. The output voltage is determined by the switching frequency of the PWM signal as well as the duty cycle of the signal, which is adjustable with external components.The UC3844BVDR2 also provides protection features such as over-voltage protection and under-voltage lockout. The device also has an internal temperature sensor which allows the device to enter a safe state if the die temperature gets too high. Finally, the UC3844BVDR2 also has an adjustable soft-start feature to reduce start-up surge currents.These features make the UC3844BVDR2 ideal for use in a variety of applications. The device is suitable for use in both offline and online switching power supplies ranging from 4-30W in the single output ranges. The device also offers improved protection features such as thermal shutdown or failure protection, as well as adjustable soft-start features. In addition, the device can be used in both FFM and VFM modes, providing increased performance and power control.

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