UC1843AVTD2

Voltage - Supply (Vcc/Vdd):	7.6 V ~ 30 V
Supplier Device Package:	Die
Package / Case:	Die
Operating Temperature:	-55°C ~ 125°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	96%
Frequency - Switching:	Up to 500kHz
Series:	--
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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UC1843AVTD2 Application Field and Working Principle

The UC1843AVTD2 is a FM regulated current-mode PWM controller. It is designed for off-line and DC-to-DC converter applications, such asSwitch Mode Power Supplies (SMPS) and Uninterruptible Power Supplies (UPS). It operates in the continuous conduction mode (CCM) and provides PWM current-mode control.

Features and Benefits

• High accuracy current mode control
• Integrated power MOSFET
• Low operating current of 1.5 mA
• Programmable switching frequency
• Optimized for light load operation
• Integrated voltage reference
• Can double integration with single voltage loop and no opto-isolator

Application Field

The UC1843AVTD2 is suitable for driving various types of resistive and inductive loads, such as power supplies, battery chargers, lighting, heating, and motor controllers. It provides low operating current, high accuracy current mode control, and optimized light load efficiency.

Working Principle

The UC1843AVTD2 operates in the continuous conduction mode (CCM). In CCM, the inductor current always continues to rise exponentially after zero crossing. The UC1843AVTD2 senses the instantaneous current in the inductor and compares it to an internal reference voltage. When the current reaches the reference level, the controller switches off the power MOSFET and the inductor current begins to fall until the zero crossing point is reached.

Protection Features

The UC1843AVTD2 provides several protection features, including short-circuit, overcurrent and undervoltage lockout (UVLO). The short-circuit protection shuts off the power supply when the output is shorted. The over-current protection limits the inductor current to a safe value. The UVLO ensures that the input power is above a predetermined level before the output can be enabled.

Conclusion

The UC1843AVTD2 is a highly efficient and cost effective solution for off-line and DC-to-DC converter applications. It provides high accuracy current mode control, low operating current, and integrated protection features. It is suitable for a variety of applications, including power supplies, battery chargers, lighting, heating, and motor controllers.

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