TOP271EG

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High Efficiency, Low Standby Power, Wide Input Voltage Range
• Package: TO-220-7L
• Essence: Switching Power Supply Controller
• Packaging/Quantity: Tray, 500 units per tray

Specifications

• Input Voltage Range: 85VAC to 265VAC
• Output Power: Up to 25W
• Switching Frequency: 132 kHz to 200 kHz
• Operating Temperature Range: -40°C to +125°C
• Protection Features: Overvoltage Protection, Overcurrent Protection, Overtemperature Protection

Detailed Pin Configuration

1. VCC: Power supply voltage input
2. FB: Feedback pin for regulating the output voltage
3. COMP: Compensation pin for stability control
4. CS: Current sense pin for current limit protection
5. GND: Ground reference
6. DRAIN: Switching power MOSFET drain connection
7. SOURCE: Switching power MOSFET source connection

Functional Features

• Primary-Side Regulation: Eliminates opto-coupler and secondary-side feedback components, reducing cost and complexity.
• Frequency Jittering: Reduces EMI emissions, enabling compliance with international standards.
• Auto-restart: Protects against fault conditions such as output short circuit or open loop, ensuring continuous operation.
• Cycle-by-Cycle Current Limiting: Provides accurate current regulation, preventing excessive power dissipation.

Advantages

• High efficiency, resulting in reduced power consumption and heat generation.
• Low standby power, meeting energy-saving requirements.
• Wide input voltage range, suitable for universal mains applications.
• Compact TO-220-7L package, facilitating easy integration into various designs.
• Comprehensive protection features ensure reliable operation and safeguard connected devices.

Disadvantages

• Requires external components for complete power supply implementation.
• Limited output power capability compared to higher-rated ICs in the same category.
• May require additional heat sinking for high-power applications.

Working Principles

The TOP271EG is a switching power supply controller that operates on the principle of pulse width modulation (PWM). It regulates the output voltage by controlling the duty cycle of the switching MOSFET. The primary-side regulation eliminates the need for an opto-coupler and secondary-side feedback components, simplifying the design and reducing cost. The frequency jittering technique reduces electromagnetic interference (EMI) emissions, ensuring compliance with international standards.

Detailed Application Field Plans

The TOP271EG is widely used in various applications, including:

1. AC/DC Power Supplies: Provides efficient power conversion for consumer electronics, industrial equipment, and lighting systems.
2. Battery Chargers: Enables fast and reliable charging of batteries in portable devices, electric vehicles, and renewable energy systems.
3. LED Drivers: Delivers constant current or constant voltage to drive LEDs in lighting fixtures, displays, and automotive applications.
4. Audio Amplifiers: Offers power management capabilities for audio amplification circuits in home theater systems, car audio, and professional audio equipment.

Detailed and Complete Alternative Models

1. TOP258PN: Similar functionality with different pin configuration and package (DIP-8).
2. LNK364GN: Integrated offline switcher with similar specifications and features.
3. UC3842B: PWM controller with adjustable frequency and duty cycle for power supply applications.

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