UC3855AN

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Mode:	Average Current
Frequency - Switching:	500kHz
Current - Startup:	150µA
Voltage - Supply:	15.5 V ~ 20 V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Through Hole
Package / Case:	20-DIP (0.300", 7.62mm)
Supplier Device Package:	20-PDIP
Base Part Number:	UC3855A

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UC3855AN Application Field and Working Principle

UC3855AN is an integrated voltage regulator circuit from Texas Instruments. It is one of the many power factor correction (PFC) integrated circuits available in the market today. The UC3855AN is used to reduce power distortions caused by non-linear loads. This type of regulator was developed to help reduce harmonic distortion in the system, as well as reduce power losses due to inefficient utilization of the available power supply voltage.In general, non-linear loads create distortion in the power system due to their poor power factor. This type of distortion is referred to as harmonic distortion, and it adversely affects the performance of other equipment connected to the system. The major cause of this power distortion is the non-linear load’s current draw, which changes in relation to the input voltage.This type of distortion can cause power losses due to the parasitic inductance and capacitance of the system as well as interfering with other electronic components on the same system. The UC3855AN is designed to reduce this type of distortion.

How does the UC3855AN work?

The UC3855AN uses a closed loop control system to ensure improved power factor, better line regulation and reduced current waveform distortion. The controller works by comparing the output voltage at the load to a reference voltage, adjusting the duty cycle of the main switch in order to maintain the correct system voltage.This closed-loop control system works by monitoring the output voltage at the load, adjusting the duty cycle of the main switch in order to maintain the desired voltage. The error amplifier compares the reference voltage to the output voltage and modulates the duty cycle as necessary. The oscillator frequencies are set by pins 6 and 7.The UC3855AN is a pulse-width modulation (PWM) integrated circuit. It will adjust the duty cycle of the main switch to maintain the output voltage at the load. This type of PFC system can improve the power factor of a non-linear load, reducing overall harmonic distortion of the system.Current waveform distortion occurs when the load current does not follow the mains supply waveform. This type of distortion is common in non-linear loads due to their current draw being dependent on the input voltage. The UC3855AN will regulate the current waveform of a load and reduce the harmonic distortion produced by these loads.

Applications of the UC3855AN

The UC3855AN is used in a wide range of applications, such as adjustable power converters, switching power supplies and converters. It is often found in consumer electronics, automotive and industrial equipment.The UC3855AN can be used in applications requiring improved power factor and reduced current waveform distortion. The controller can be used in high power applications, such as motors and transformers, where harmonic distortion is a concern.The UC3855AN can also be used in lighting systems, where it can improve the overall power factor and reduce line loss. This type of system can also reduce electromagnetic interference (EMI) from fluorescent and halogen lamps.

Conclusion

The UC3855AN is an integrated voltage regulator circuit from Texas Instruments. It is part of their Power Factor Correction range and is used to reduce power distortions caused by non-linear loads. The UC3855AN works by comparing the output voltage at the load to a reference voltage, adjusting the duty cycle of the main switch in order to maintain the correct system voltage.This type of PFC system can improve the power factor of a non-linear load, reducing overall harmonic distortion in the system. It can also be used to reduce current waveform distortion and reduce EMI from fluorescent and halogen lamps. The UC3855AN is used in a wide range of applications, such as adjustable power converters, switching power supplies and converters.

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