UC3872DWTRG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High-performance power factor correction controller
• Package: SOIC-16
• Essence: Efficiently converts AC input to regulated DC output
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 85VAC to 265VAC
• Output Voltage Range: 380VDC to 400VDC
• Maximum Output Power: 300W
• Operating Temperature Range: -40°C to +85°C
• Efficiency: Up to 98%
• Frequency Range: 50Hz to 60Hz

Detailed Pin Configuration

1. VCC: Power supply voltage input
2. FB: Feedback pin for regulating the output voltage
3. COMP: Compensation pin for loop stability
4. CS: Current sense pin for monitoring the input current
5. RT/CT: Timing components for controlling the switching frequency
6. GND: Ground reference
7. INV: Inverting input of the error amplifier
8. VREF: Reference voltage output
9. OSC: Oscillator timing capacitor
10. SS: Soft-start pin for gradual startup
11. DTC: Duty cycle control pin
12. CT: Timing capacitor for soft-start
13. DRV: Gate driver output
14. OUT: Output voltage
15. NC: No connection
16. HV: High-voltage input

Functional Features

• High power factor correction (PFC) performance
• Wide input voltage range for universal compatibility
• Accurate regulation of output voltage
• Overvoltage and overcurrent protection
• Soft-start function for smooth startup
• Low standby power consumption
• Built-in gate driver for external MOSFET control

Advantages and Disadvantages

Advantages: - High efficiency leading to energy savings - Improved power factor resulting in reduced harmonics - Compact package for space-constrained applications - Robust protection features ensuring system reliability - Easy integration into various power supply designs

Disadvantages: - Requires external components for complete power supply implementation - Limited output power compared to higher-rated PFC controllers - Higher cost compared to non-PFC power supply solutions

Working Principles

The UC3872DWTRG4 is a power factor correction controller designed to improve the efficiency and power quality of AC-DC power supplies. It operates by regulating the input current waveform to achieve a high power factor and low harmonic distortion. The controller uses a boost converter topology to convert the AC input voltage to a regulated DC output voltage.

During operation, the UC3872DWTRG4 continuously monitors the input current through the CS pin and adjusts the duty cycle of the external MOSFET connected to the HV pin. This control mechanism ensures that the input current follows the shape of the input voltage, resulting in a near-unity power factor.

The controller also provides comprehensive protection features such as overvoltage and overcurrent protection, ensuring safe and reliable operation of the power supply.

Detailed Application Field Plans

The UC3872DWTRG4 is widely used in various power management applications, including:

1. Switched-mode power supplies (SMPS)
2. LED lighting systems
3. Industrial motor drives
4. Uninterruptible power supplies (UPS)
5. Electric vehicle charging stations
6. Renewable energy systems

Its high-performance PFC capabilities make it suitable for applications where compliance with power quality standards is essential.

Detailed and Complete Alternative Models

1. UC3854: High-performance power factor correction controller with similar specifications and features.
2. NCP1653: Integrated PFC controller with enhanced protection features and higher output power capability.
3. L6562A: Transition-mode PFC controller with advanced control algorithms for improved efficiency.

These alternative models offer similar functionality and can be considered as substitutes based on specific application requirements.

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