Overview
The UC3854ADWTR, produced by Texas Instruments, is a high-power factor preregulator integrated circuit designed to optimize power-line current usage while minimizing line-current distortion. This device is crucial for power systems that require active power factor correction to ensure sinusoidal current draw from sinusoidal power lines. The UC3854ADWTR implements all necessary control functions for building a power supply with high power factor and low distortion.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | 16-pin SOIC (DW) | |
| Operating Temperature Range | 0°C to 70°C | |
| PWM Frequency | Up to 200 kHz | |
| Supply Current (Startup) | 300 µA | |
| Supply Current (Operating) | 12 mA to 18 mA | |
| Gate Driver Current | 1.5 A peak | |
| Reference Voltage | 7.5 V | |
| Line Frequency Range | 50 Hz to 400 Hz | |
| Line Voltage Range | 75 V to 275 V |
Key Features
- Control Boost PWM to 0.99 Power Factor
- Limit Line-Current Distortion to < 5%
- World-Wide Operation Without Switches
- Feedforward Line Regulation
- Average Current-Mode Control
- Low Noise Sensitivity
- Low Startup Supply Current
- Fixed-Frequency PWM Drive
- Low-Offset Analog Multiplier and Divider
- 1-A Totem-Pole Gate Driver
- Precision Voltage Reference
- Integrated Current- and Voltage-Amplifier Output Clamps
- VREF GOOD Comparator and Faster ENABLE Comparator
- UVLO Options (16 V/10 V or 10.5 V/10 V)
Applications
The UC3854ADWTR is suitable for various power supply applications that require high power factor correction, including:
- Single-phase and three-phase power systems
- Power supplies for consumer electronics, industrial equipment, and medical devices
- High-efficiency power conversion systems
- Systems requiring compliance with international power factor standards
Q & A
- What is the primary function of the UC3854ADWTR?
The primary function of the UC3854ADWTR is to provide active power factor correction for power systems, ensuring that the current drawn from the power line is sinusoidal and in phase with the voltage.
- What package types are available for the UC3854ADWTR?
The UC3854ADWTR is available in 16-pin SOIC (DW) packages among others.
- What is the operating temperature range of the UC3854ADWTR?
The operating temperature range is from 0°C to 70°C.
- What is the maximum PWM frequency supported by the UC3854ADWTR?
The UC3854ADWTR supports PWM frequencies up to 200 kHz.
- What is the startup supply current of the UC3854ADWTR?
The startup supply current is 300 µA.
- What is the peak current of the gate driver in the UC3854ADWTR?
The gate driver can deliver a peak current of 1.5 A.
- What is the reference voltage provided by the UC3854ADWTR?
The reference voltage is 7.5 V.
- What line frequency range does the UC3854ADWTR support?
The UC3854ADWTR supports line frequencies from 50 Hz to 400 Hz.
- What line voltage range does the UC3854ADWTR support?
The UC3854ADWTR supports line voltages from 75 V to 275 V.
- What control method does the UC3854ADWTR use for current control?
The UC3854ADWTR uses average current-mode control.
