UC3875QP

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High-performance PWM Controller
• Package: QP (Quad Flat Package)
• Essence: Regulates power supply in various applications
• Packaging/Quantity: Available in tape and reel packaging, quantity varies based on supplier

Specifications

• Input Voltage Range: 10V to 20V
• Output Voltage Range: 0V to 15V
• Operating Temperature Range: -40°C to 85°C
• Maximum Duty Cycle: 100%
• Frequency Range: 50kHz to 1MHz
• Output Current: Up to 2A
• Supply Voltage: 4.5V to 20V

Detailed Pin Configuration

The UC3875QP has the following pin configuration:

1. VCC: Power supply voltage input
2. GND: Ground reference
3. COMP: Compensation pin for feedback control loop
4. RT/CT: Timing components connection pin
5. CS: Current sense input pin
6. FB: Feedback voltage input pin
7. OUT: Output voltage pin
8. SYNC: Synchronization input pin
9. SS/TR: Soft-start and shutdown control pin
10. INV: Inverting input pin
11. NC: No connection pin
12. UVLO: Under-voltage lockout pin
13. OSC: Oscillator timing capacitor connection pin
14. OSC/RT: Oscillator timing resistor connection pin
15. REF: Reference voltage output pin
16. VREF: Reference voltage input pin

Functional Features

• High-performance pulse-width modulation (PWM) controller
• Provides precise regulation of power supply
• Wide input voltage range for versatile applications
• Adjustable output voltage and frequency
• Over-current protection
• Soft-start and shutdown control
• Synchronization capability for multi-phase operation
• Under-voltage lockout (UVLO) protection

Advantages and Disadvantages

Advantages: - High-performance and precise power regulation - Wide input voltage range allows for flexibility in applications - Adjustable output voltage and frequency provide customization options - Over-current protection ensures safe operation - Soft-start and shutdown control for smooth power transitions - Synchronization capability enables multi-phase operation - UVLO protection prevents damage due to low voltage conditions

Disadvantages: - Limited output current capacity (up to 2A) - Requires external timing components for operation - Not suitable for high-power applications

Working Principles

The UC3875QP is a high-performance PWM controller that regulates the power supply in various applications. It operates by comparing the feedback voltage with a reference voltage and adjusts the duty cycle of the output waveform accordingly. This control mechanism ensures precise regulation of the output voltage.

The IC incorporates features such as over-current protection, soft-start and shutdown control, synchronization capability, and under-voltage lockout (UVLO) protection. These features enhance the reliability and safety of the power supply system.

Detailed Application Field Plans

The UC3875QP is commonly used in the following application fields:

1. Switching Power Supplies: The IC is widely employed in switch-mode power supplies (SMPS) for various electronic devices, including computers, telecommunication equipment, and industrial machinery.

2. LED Lighting: The precise regulation capabilities of the UC3875QP make it suitable for driving LED lighting systems, ensuring stable and efficient illumination.

3. Motor Control: The IC can be utilized in motor control circuits, providing accurate power regulation for motors in appliances, automotive systems, and robotics.

4. Audio Amplifiers: The UC3875QP can be integrated into audio amplifier designs to regulate the power supply for optimal audio performance.

Detailed and Complete Alternative Models

1. UC3875N: DIP (Dual Inline Package) version of the UC3875QP
2. UC3875DWP: SOIC (Small Outline Integrated Circuit) version with increased power dissipation capability
3. UC3875DW: SOIC version with similar specifications to UC3875QP

These alternative models offer similar functionality and can be used as replacements for the UC3875QP in various applications.

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