UC3843BVN

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UC3843BVN is a high performance, voltage mode, current mode, bidirectional, peak current mode switchmode regulator controller. It is designed to control all types of switchmode DC-DC converters including boost, flyback, forward and other topologies.This device is designed to provide better features and enhanced performance. It features improved drive capability, supply voltage up to 42V, sink and source output capability, standby current as low as 8mA, fast current limit digitally programmed and 4µs internal current limit response time. It also has an internal temperature sensing circuit that gives temperature compensation for current limit.As an application field, UC3843BVN can be used to control the power output of a wide range of power supplies from LED lighting products to industrial equipment and audio equipment. The device\'s low current consumption, low start-up current, wide voltage range and low cost make this controller especially suitable for low power applications.In terms of working principle, UC3843BVN is an integrated controller for regulating the output voltage of switched mode power supplies. A brief explanation is as follows:The device contains an oscillator, a current sensing circuit, a driver circuit, and a ramp generator circuit. The oscillator generates a square wave that is applied to the upper gate of a power MOSFET. This generates the drive to the power switch. The voltage from the output is sensed and compared with a reference voltage. The resulting error signal is amplified and used to control the oscillator. The current level is sensed by monitoring the voltage across a resistive load connected to the power switch. When the voltage across the load exceeds the current limit threshold, the oscillator is shut off, turning off the power switch.Thus, UC3843BVN is a DC DC Switching Controller which has a wide application field and is used to regulate the output voltage of switched mode power supplies. The device offers superior performance, increased efficiency, and better features coupled with a low cost.

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