E-UC3843BD1

Frequency - Switching:	250kHz
Base Part Number:	UC3843B
Supplier Device Package:	8-SO
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	96%
Series:	--
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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<p>The STMicroelectronics (ST) E-UC3843BD1 is a high performance, monolithic integrated circuit switchingmode voltage regulator control circuit with a minimal external parts count. It is designed to be used in fixed frequency, pulse width modulation (PWM) type DC-DC switching power supplies with step-down (buck) topology. The application field of the E-UC3843BD1 include but is not limited to a wide range of distributed power systems, computer related products, air conditioners, low AC voltages, low AC current applications and many more.</p><p>The E-UC3843BD1 has a variety of features that make it a desirable choice for power supply design. The device provides a high level of integration and low total system cost, as well as excellent load and line regulation. It features an input voltage range of up to 100V, an output current capability of up to 8A, and a frequency range of up to 200 kHz. It also provides thermal protection, over-voltage safety shutdown and under-voltage lockout.</p><p>In order to understand the working principle of the E-UC3843BD1, it is important to understand the different components of a switching power supply system and how they work together to convert AC voltage to DC voltage. The main components used in such a system include an input transformer, rectifier, filter, output transformer, PWM controller and a MOSFET switch. The input transformer steps down the line voltage to a level suitable for the rectifier. The rectifier converts the AC voltage to DC voltage. The filter further smooths the DC voltage output. The output transformer steps up the DC voltage before it is inverted to obtain the desired output voltage. The PWM controller controls the operation of the output MOSFET switch, causing it to turn on and off at a specific frequency. This in turn generates a PWM signal with the desired voltage, that can be used as the output voltage. The E-UC3843BD1 is used to drive the MOSFET switch, so that the voltage output of the system is regulated.</p><p>The E-UC3843BD1 incorporates several control functions, including over-current protection, under-voltage protection, over-voltage protection, thermal shut-down, soft voltage ramp up and low EMI. It also features improved efficiency and a high level of immunity to transient conditions such as load dumps and input voltage transients. These functions are essential for today\'s demanding applications where reliability is of primary concern.</p><p>In conclusion, the STMicroelectronics E-UC3843BD1 is a versatile and powerful switching mode voltage regulator control IC, with an application field comprising of a wide range of distributed power systems, computer related products, air conditioners, low AC voltages, low AC current applications and many more. Its unique features and functions make it an ideal choice for power supply design in various applications.</p>

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