UC3843AD1

Frequency - Switching:	Up to 500kHz
Base Part Number:	UC3843A
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
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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UC3843AD1 is a device belonging to PMIC(Power Management IC) family and more precisely to the Voltage Regulator subfamily and the DC DC Switching Controllers class. This device could be used for multiple purposes, one of which is controlling the power supply voltages in a system.Working PrincipleUC3843AD1 is based on the principle of pulse width modulation (PWM) for controlling the power supply voltages. Its basic principle is simple. In PWM, the output can be easily set to a certain voltage level by adjusting the ratio between ON and OFF time of a square wave or any other type of wave with equal ON and OFF time. By adjusting the ON and OFF time of the wave, we can adjust the output voltage.The UC3843AD1 is a linear current mode PWM controller. It has two part, the oscillator and the comparator. The oscillator produces a square wave with equal ON and OFF times and the comparator compares it with the output voltage. If the voltage is higher than the set value, the comparator will turn off the output voltage and if it is lower, then the comparator will turn on the output voltage. This process is repeated with each cycle, thus allowing the output voltage to be adjusted continuously.The device has a PWM Ramp Circuit which helps in avoiding a dramatic increase in the output voltage when the comparator turns on the output voltage. This prevents the output voltage from being affected by noise and other disturbances.Application FieldUC3843AD1 is used for controlling the power supply voltages in various kinds of systems. These systems include power supplies, switching supplies and converters. It is mostly used in applications where the output voltage needs to be adjusted continuously or at low noise levels. Some of the common applications include computer systems, telecommunication systems, motor speed controllers and motor control systems.ConclusionUC3843AD1 is a device belonging to PMIC (Power Management IC) family and more precisely to the Voltage Regulator subfamily and the DC DC Switching Controllers class. It is based on the principle of pulse width modulation (PWM) for controlling the power supply voltages. It could be used for controlling the power supply voltages in various kinds of systems, including power supplies, switching supplies and converters. It is mostly used in applications where the output voltage needs to be adjusted continuously or at low noise levels.

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