UC1843TD2

Frequency - Switching:	Up to 500kHz
Base Part Number:	UC1843
Supplier Device Package:	Die
Package / Case:	Die
Operating Temperature:	--
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, Forward
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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The UC1843TD2 is a high-efficiency monolithic pulse width modulation (PWM) current-mode control IC for controlling DC/DC switching regulators. As an advanced and robust current-mode control solution, the UC1843TD2 can provide active power factor correction (PFC) and other power conversion needs. The UC1843TD2 is suitable for Flyback, Forward, and Boost converter topologies.The UC1843TD2 implicates a fixed frequency PWM operation, with adjustable on-time per switching cycle and operates of up to 650 kHz frequency, allowing for a wide range of design applications with low component count and minimal external components. The on-time can be adjusted by a single external resistor, allowing the use of a wide range of output power requirements. The device also features very low start-up and shutdown current, a low operating current of 85 μA and a wide input voltage range of 1. Calibration circuits are included to maximize the output accuracy of the overall system. In terms of features, the UC1883TD2 supports an advanced adaptive dead-time control (DTC) architecture, allowing the device to accurately maintain a fixed switching frequency while dynamically adjusting the dead-time to maintain a fast transient response and high loop gain. The device also supports external synchronization and reduce noise. Additional built-in features such as cycle by cycle over-current protection, over-temperature protection and short-circuit protection make the UC1883TD2 a reliable, high performance solution for switching regulator applications.The UC1883TD2 is suitable for a wide range of application fields such as low- and high-power LED lighting, consumer applications, consumer mobility and other electronic applications. As such, the UC1883TD2 is a general-purpose solution for all types of DC/DC PFC rectifier designs, and Buck, Buck-boost, Flyback, and Boost PWM applications.To better understand the operation principles of the UC1883TD2, let us take a look at how the device works.In terms of working principle, the UC1883TD2 is controlled by an internal PWM comparator. This comparator is connected to a voltage loop sampling pin, where the feedback signal of the output voltage is fed. This voltage amplifies the output voltage, compares the amplified voltage with a reference voltage and takes the necessary steps to control the duty cycle of the UC1883TD2 output.The UC1883TD2 also has a gated oscillator to ensure fixed frequency PWM operation. This fixed frequency PWM can be programmed by adjusting the external resistor and capacitor values. The UC1883TD2 also has a pre-bias function that increases the efficiency of the overall system, by reducing start-up time and time to full load.Also included in the UC1883TD2 is a soft-start circuit that reduces in-rush current upon start-up. This circuit helps against load oscillations and provides smoother start-ups. Other features such as over-voltage protection, on-off control, latch control, current limit, and thermal protection provide additional stability and reliability.Overall, the UC1883TD2 provides a robust and reliable solution for PFC and DC/DC Buck, Buck-boost, Flyback, and Boost PWM applications in consumer, consumer mobility, and lighting applications. The device features active power factor correction and an adjustable on-time control, while the gated oscillator and calibration circuits enable higher system efficiency and accuracy. The device\'s built-in features and soft-start circuitry further provide system stability and reliability, making it the ideal choice for applications of all types.

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