Overview
The UC3854BDWG4 is an advanced high-power factor preregulator controller produced by Texas Instruments. This integrated circuit (IC) is designed to achieve near-unity power factor correction (PFC) in power supply systems. It utilizes average current mode control to shape the AC input line current waveform, ensuring stable and low distortion sinusoidal line current without the need for slope compensation. The UC3854BDWG4 is part of the enhanced UC3854A/B series, offering improved features and performance over its predecessors.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | UC3854BDWG4 |
| Manufacturer | Texas Instruments |
| Mode | Average Current |
| Frequency - Switching | 200kHz |
| Current - Startup | 250µA |
| Voltage - Supply | 10V ~ 20V |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount |
| Package / Case | 16-SOIC (0.295", 7.50mm Width) |
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 AC Offset (Eliminates External Resistor), 0 V to 5 V Multout Common-Mode Range
- VREFGOOD Comparator and 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 UC3854BDWG4 is primarily used in power supply systems that require high power factor correction, such as:
- Switch-Mode Power Supplies
- Offline Power Supplies
- High-Power DC-DC Converters
- Power Factor Corrected Preregulators
- Industrial and Consumer Electronics
Q & A
- What is the primary function of the UC3854BDWG4?
The UC3854BDWG4 is designed to achieve near-unity power factor correction in power supply systems by shaping the AC input line current waveform.
- What is the switching frequency of the UC3854BDWG4?
The switching frequency is 200kHz.
- What is the startup supply current of the UC3854BDWG4?
The startup supply current is 250µA.
- What is the operating temperature range of the UC3854BDWG4?
The operating temperature range is 0°C to 70°C.
- What type of package does the UC3854BDWG4 come in?
The UC3854BDWG4 comes in a 16-SOIC (0.295", 7.50mm Width) package.
- Does the UC3854BDWG4 support world-wide operation without switches?
- What are the UVLO options available for the UC3854BDWG4?
The UVLO options are 16 V/10 V or 10.5 V/10 V.
- What is the bandwidth of the current amplifier in the UC3854BDWG4?
The bandwidth of the current amplifier is 5 MHz.
- Does the UC3854BDWG4 have integrated current- and voltage-amplifier output clamps?
- What is the typical application of the UC3854BDWG4?
The UC3854BDWG4 is typically used in switch-mode power supplies, offline power supplies, and high-power DC-DC converters.
