UCC25702N - English Editing Encyclopedia Entry

Product Overview

Category

UCC25702N belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in power management applications.

Characteristics

• UCC25702N is a high-performance voltage mode PWM controller.
• It operates at a wide input voltage range, making it suitable for various power supply designs.
• The IC offers excellent line and load regulation, ensuring stable output voltages.
• It features adjustable frequency and soft-start functions, providing flexibility in power management.

Package and Quantity

UCC25702N is available in a standard 8-pin dual in-line package (DIP). It is typically sold in reels containing 250 units.

Specifications

• Input Voltage Range: 4.5V to 65V
• Output Voltage Range: 0.8V to 60V
• Operating Temperature Range: -40°C to 125°C
• Switching Frequency: Adjustable up to 1MHz
• Maximum Duty Cycle: 100%

Pin Configuration

The UCC25702N IC has the following pin configuration:

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| | --| VCC GND |-- Pin 1: Power Supply --| FB COMP |-- Pin 2: Feedback and Compensation --| CS SS |-- Pin 3: Current Sense and Soft-Start --| RT CT |-- Pin 4: Oscillator Timing Components --| OUT SYNC |-- Pin 5: Output and Synchronization --| NC EN |-- Pin 6: Not Connected and Enable --| INV UVLO |-- Pin 7: Inverting Input and Undervoltage Lockout --| REF DRV |-- Pin 8: Reference and Gate Driver |___________| ```

Functional Features

1. Voltage Mode PWM Control: UCC25702N utilizes voltage mode control to regulate the output voltage accurately.
2. Wide Input Voltage Range: The IC can operate within a wide input voltage range, making it suitable for various power supply designs.
3. Adjustable Frequency: The switching frequency of UCC25702N can be adjusted according to the application requirements.
4. Soft-Start Function: It incorporates a soft-start feature that gradually ramps up the output voltage, reducing inrush current and improving system reliability.
5. Excellent Line and Load Regulation: UCC25702N ensures stable output voltages even under varying line and load conditions.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for versatile applications.
• Adjustable frequency provides flexibility in power management.
• Soft-start function reduces inrush current and enhances system reliability.
• Excellent line and load regulation ensures stable output voltages.

Disadvantages

• Limited pin configuration may restrict certain complex power supply designs.
• Lack of built-in protection features may require additional external circuitry for certain applications.

Working Principles

UCC25702N operates based on the voltage mode control technique. It compares the feedback voltage with a reference voltage to generate an error signal. This error signal is then amplified and used to control the duty cycle of the PWM signal. By adjusting the duty cycle, the IC regulates the output voltage to maintain it at the desired level.

The soft-start function gradually increases the duty cycle during startup, preventing excessive inrush current. The adjustable frequency feature allows optimization of the switching frequency based on the specific application requirements.

Application Field Plans

UCC25702N finds extensive use in various power management applications, including but not limited to: - DC-DC converters - AC-DC converters - LED lighting systems - Industrial power supplies - Telecom power systems

Alternative Models

1. UCC25702M: Similar to UCC25702N, but available in a smaller surface-mount package.
2. UCC25703N: Offers additional protection features such as overvoltage and overcurrent protection.
3. UCC25704N: Provides higher output current capability for demanding applications.

These alternative models offer similar functionality to UCC25702N while catering to specific design requirements.

In conclusion, UCC25702N is a versatile voltage mode PWM controller used in power management applications. Its wide input voltage range, adjustable frequency, and soft-start function make it suitable for various designs. However, designers should consider the limited pin configuration and the need for additional external circuitry for certain applications.