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Product Detailed Parameters
- Description：IC PFC CTR AV CURR 500KHZ 20DIP
- Series：-
- Mfr：Texas Instruments
- Package：Tube
- Mode：Average Current
- Frequency - Switching：500kHz
- Voltage - Supply：15.5V ~ 20V
- Operating Temperature：0°C ~ 70°C
- Mounting Type：Through Hole
- Package / Case：20-DIP (0.300", 7.62mm)
- Supplier Device Package：20-PDIP
- Current - Startup：150 µA
- Grade：-
- Qualification：-
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Overview
The UC3855AN is a high-performance power factor preregulator controller from Texas Instruments, designed for average current mode control. It operates with a maximum switching frequency of 500 kHz and supports a supply voltage range of 10 V to 20 V. The device features zero-power detection and requires a start-up supply current of 0.3 mA. It is housed in a 20-pin PDIP package with dimensions of approximately 27.94 mm in length, 7.62 mm in width, and 4.57 mm in height. The operational temperature range extends from 0 °C to +70 °C.
Feature Summary
- Provides average current mode control for power factor correction applications
- Includes integrated zero-power detection capability
- Supports high-frequency operation up to 500 kHz
Applications
- Power factor preregulator circuits
- Average current mode PFC controllers
- High-performance power factor correction systems
Procurement Notes
Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix 'AN' corresponds to the 20-pin PDIP package variant. Check for obsolescence status as this part may be discontinued. Ensure compatibility with existing PCB footprints and thermal management requirements before procurement.
Selection Notes
Select this component for designs requiring average current mode PFC control. Verify that the 20-pin PDIP package fits the mechanical constraints. Ensure the input voltage stays within the 10 V to 20 V range. Consider the 500 kHz switching frequency for inductor sizing. Confirm the commercial temperature range meets environmental needs.
Part Context
The UC3855AN belongs to the UC385xA series of power factor preregulators. It is distinct from the UC3854 series which typically operates at lower frequencies. This component is part of Texas Instruments' legacy PMIC portfolio. It serves as a dedicated controller for improving power efficiency in AC-DC conversion stages.
Replacement Considerations
The UC3855ADW is listed as a similar substitute option. Verify pinout compatibility and electrical specifications before substitution. Check if the SOIC package variant meets the assembly requirements.
