UC3872NG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High-performance power factor correction controller
• Package: DIP-16 (Dual In-line Package with 16 pins)
• Essence: Efficiently controls power factor correction in electronic devices
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Input Voltage Range: 85V to 265V AC
• Output Voltage Range: 10V to 20V DC
• Operating Frequency: 100kHz to 500kHz
• Maximum Duty Cycle: 95%
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

1. VCC: Power supply voltage input
2. GND: Ground reference
3. COMP: Compensation pin for feedback control
4. RT/CT: Timing components connection for oscillator frequency control
5. CS: Current sense input for current limit protection
6. FB: Feedback pin for output voltage regulation
7. INV: Inverting input for error amplifier
8. VREF: Reference voltage output
9. VSENSE: Voltage sense input for output voltage regulation
10. OSC: Oscillator timing capacitor connection
11. SS: Soft-start capacitor connection
12. SD: Shutdown pin for enabling/disabling the device
13. NC: No connection
14. NC: No connection
15. NC: No connection
16. NC: No connection

Functional Features

• High-performance power factor correction (PFC) controller
• Enables efficient conversion of AC input to regulated DC output
• Provides precise control over power factor correction
• Supports a wide input voltage range for versatile applications
• Incorporates current limit protection for enhanced safety
• Offers soft-start functionality for smooth power-up
• Shutdown pin allows easy enable/disable control

Advantages and Disadvantages

Advantages

• High-performance PFC controller ensures efficient power conversion
• Wide input voltage range enables versatile applications
• Current limit protection enhances safety
• Soft-start functionality ensures smooth power-up

Disadvantages

• Limited pin configuration options may restrict certain applications
• Requires external timing components for oscillator frequency control

Working Principles

The UC3872NG4 is a high-performance power factor correction (PFC) controller designed to efficiently convert AC input to regulated DC output. It utilizes an error amplifier, feedback loop, and various control pins to achieve precise power factor correction. By actively controlling the input current waveform, it minimizes harmonic distortion and improves overall power efficiency.

The device operates by comparing the feedback voltage from the output with a reference voltage. The error amplifier amplifies the difference between these voltages and generates an error signal. This signal is then used to adjust the duty cycle of the internal power switch, which controls the power delivered to the load.

Additionally, the UC3872NG4 incorporates current sense input for current limit protection, soft-start functionality for smooth power-up, and a shutdown pin for easy enable/disable control.

Detailed Application Field Plans

The UC3872NG4 is widely used in various power management applications, including:

1. Switching Power Supplies
2. LED Lighting Systems
3. Motor Drives
4. Industrial Equipment
5. Telecommunications Equipment
6. Consumer Electronics

Its high-performance characteristics and versatile input voltage range make it suitable for a wide range of applications requiring efficient power factor correction.

Detailed and Complete Alternative Models

1. UC3872N: Similar functionality, but available in a different package (PDIP-16)
2. UC3854: Enhanced version with additional features such as overvoltage protection and power good signal
3. UC3856: Higher voltage version with extended input voltage range and improved efficiency

These alternative models offer similar functionality to the UC3872NG4, providing options for different package preferences or additional features as per specific application requirements.

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