UC3843DX

Frequency - Switching:	Up to 500kHz
Base Part Number:	UC3843
Supplier Device Package:	14-SOP
Package / Case:	14-SOIC (0.209", 5.30mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	97%
Series:	--
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 30 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Part Status:	Obsolete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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UC3843DX Application Field and Working Principle

UC3843DX is a DC-DC switching controller belonging to the family of Pulse Width Modulation Integrated Circuits (PMIC). It is a low-cost, easy to use option for DC-DC voltage regulation, allowing it to be used in a wide range of applications.The two main applications of UC3843DX are current-mode and voltage-mode DC-DC switching controllers. In current-mode applications, the circuit receives a voltage across its reference inputs and oscillates at a fixed frequency proportional to the level of the input voltage. During each cycle, the circuit measures the average current from the output and compares it with the reference voltage. If the measured current or voltage differs from the reference, the output of the circuit is adjusted to correct the difference.The power source for the UC3843DX is typically a battery or a 5V supply. A typical current-mode application of the UC3843DX would be something like a buck or boost regulator, or a buck/boost converter. The circuit would be used to convert a lower voltage to a higher voltage, or vice versa. For example, a 5V battery could be converted to 6V.In voltage-mode applications, the circuit works a little differently. It receives a reference current at its inputs and, like current-mode operation, oscillates at a fixed frequency. However, instead of measuring the average current at the output, it measures the voltage and compares it with the reference current. If the measured voltage is lower or higher than the reference current, the output of the circuit is adjusted to correct the difference.A typical voltage-mode application of the UC3843DX would be something like a linear controller or a flyback converter. These are circuits that are used to maintain a constant voltage or provide a polarity change (in the case of a flyback converter). This can be used for example for powering a mobile phone charger or for driving a motor.The UC3843DX is a popular choice for DC-DC switching applications, due to its low cost, easy to use design, and reliable performance. It also comes with various options for protecting the circuit from over-voltage, over-current, and over-temperature conditions, which help to ensure its safety and stability.Overall, the UC3843DX is an ideal solution for a wide range of DC-DC switching applications, due to its low cost, easy to use design, and reliable performance. Whatever the application may be, the UC3843DX can be relied upon to provide a reliable, stable, and cost-efficient solution.

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