Overview
The UC3854BDWTR is an enhanced bipolar Continuous Conduction Mode (CCM) Power Factor Correction (PFC) controller produced by Texas Instruments. This component is designed to provide all the necessary functions for active power factor corrected preregulators. It achieves near-unity power factor by shaping the AC input line current waveform to correspond to the AC input line voltage using average current mode control. This approach maintains stable, low distortion sinusoidal line current without the need for slope compensation. The UC3854BDWTR is available in a 16-pin SOIC (DW) package and operates over a temperature range of 0°C to 70°C.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOIC (DW), 16 pins |
| Operating Temperature Range | 0°C to 70°C |
| Switching Frequency | 200 kHz |
| Start-Up Supply Current | 300 µA |
| Minimum Operating Supply Voltage | 10 V |
| Maximum Operating Supply Voltage | 16 V |
| UVLO Turn-On Threshold | 10.5 V / 10 V |
| UVLO Turn-Off Threshold | 10 V / 10 V |
| Topology | Boost PWM |
Key Features
- Controls Boost PWM to Near-Unity Power Factor
- Limits Line Current Distortion To <3%
- World-Wide Operation Without Switches
- Accurate Power Limiting
- Fixed-Frequency Average Current-Mode Control
- High Bandwidth (5 MHz), Low-Offset Current Amplifier
- Integrated Current- and Voltage-Amplifier Output Clamps
- Multiplier Improvements: Linearity, 500 mV VACOffset (Eliminates External Resistor), 0 V to 5 V Multout Common-Mode Range
- VREFGOOD Comparator
- Faster and Improved Accuracy ENABLE Comparator
- UVLO Options (16 V/10 V or 10.5 V/10 V)
- Lower Startup Supply Current
- Enhanced Multiply/Divide Circuit
Applications
The UC3854BDWTR is primarily used in power factor correction (PFC) preregulators for various power supply applications. It is suitable for designs requiring high power factor, low line current distortion, and efficient power management. Typical applications include:
- Switch-Mode Power Supplies
- Offline Power Supplies
- High-Power Electronic Devices
- Industrial Power Systems
Q & A
- What is the primary function of the UC3854BDWTR?
The UC3854BDWTR is a power factor correction (PFC) controller designed to achieve near-unity power factor in power supply applications.
- What package types are available for the UC3854BDWTR?
The UC3854BDWTR is available in 16-pin SOIC (DW), PDIP (N), CDIP (J), and 20-pin PLCC (Q) packages.
- What is the operating temperature range of the UC3854BDWTR?
The operating temperature range is 0°C to 70°C.
- What is the switching frequency of the UC3854BDWTR?
The switching frequency is 200 kHz.
- What are the UVLO threshold options for the UC3854BDWTR?
The UVLO threshold options are 16 V/10 V and 10.5 V/10 V.
- Does the UC3854BDWTR require external components for slope compensation?
No, the UC3854BDWTR uses average current mode control, which does not require slope compensation.
- What is the start-up supply current of the UC3854BDWTR?
The start-up supply current is 300 µA.
- What are the key improvements over the UC3854?
The UC3854BDWTR offers a wide bandwidth, low offset current amplifier, faster and improved accuracy enable comparator, VREFGOOD comparator, and an enhanced multiply/divide circuit.
- Is the UC3854BDWTR compliant with EU RoHS regulations?
- What are typical applications for the UC3854BDWTR?
Typical applications include switch-mode power supplies, offline power supplies, high-power electronic devices, and industrial power systems.
