Overview
The UC2854BDWTR 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, utilizing average current mode control. This approach maintains stable, low distortion sinusoidal line current without the need for slope compensation, unlike peak current mode control.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 16-pin SOIC (DW) |
| Operating Temperature Range | -40°C to 85°C |
| Switching Frequency | 80 kHz ~ 120 kHz |
| Startup Supply Current | 250 µA |
| Supply Voltage Range | 10 V ~ 20 V |
| UVLO Thresholds | 10.5 V / 10 V |
| Mounting Type | Surface Mount |
| Line Frequency Range | 50 Hz ~ 400 Hz |
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 VAC Offset (Eliminates External Resistor), 0 V to 5 V Multout Common-Mode Range
- VREF GOOD Comparator
- Faster and Improved Accuracy ENABLE Comparator
- UVLO Options (16 V/10 V or 10.5 V/10 V)
- 300-µA Start-Up Supply Current
Applications
The UC2854BDWTR is suitable for various power supply applications that require high power factor correction, such as:
- Switch-mode power supplies
- Offline power supplies
- Active power factor corrected preregulators
- High-power electronic devices requiring efficient and stable power input
Q & A
- What is the primary function of the UC2854BDWTR?
The UC2854BDWTR is a Power Factor Correction (PFC) controller designed to achieve near-unity power factor by shaping the AC input line current waveform to correspond to the AC input line voltage.
- What type of control mode does the UC2854BDWTR use?
The UC2854BDWTR uses fixed-frequency average current-mode control.
- What is the operating temperature range of the UC2854BDWTR?
The operating temperature range is -40°C to 85°C.
- What are the UVLO threshold options for the UC2854BDWTR?
The UVLO threshold options are 16 V/10 V or 10.5 V/10 V.
- What is the switching frequency range of the UC2854BDWTR?
The switching frequency range is 80 kHz ~ 120 kHz.
- What is the startup supply current of the UC2854BDWTR?
The startup supply current is 250 µA.
- What type of package is the UC2854BDWTR available in?
The UC2854BDWTR is available in a 16-pin SOIC (DW) package.
- Does the UC2854BDWTR require external slope compensation?
No, the UC2854BDWTR does not require external slope compensation due to its average current mode control.
- What are some key features of the UC2854BDWTR's amplifier?
The amplifier features high bandwidth (5 MHz), low offset, and integrated current- and voltage-amplifier output clamps.
- What applications is the UC2854BDWTR suitable for?
The UC2854BDWTR is suitable for switch-mode power supplies, offline power supplies, active power factor corrected preregulators, and high-power electronic devices requiring efficient and stable power input.
