TOP244FN

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High Efficiency, Low Standby Power, Wide Input Voltage Range
• Package: TO-220
• Essence: Switching Power Supply Controller
• Packaging/Quantity: Tube/50 pieces

Specifications

• Input Voltage Range: 85VAC to 265VAC
• Output Power: Up to 45W
• Switching Frequency: 132 kHz
• Operating Temperature Range: -40°C to +150°C
• Protection Features: Overload Protection, Overvoltage Protection, Overtemperature Protection

Detailed Pin Configuration

1. VCC: Power Supply Voltage
2. FB: Feedback Pin for Output Voltage Regulation
3. COMP: Compensation Pin for Loop Stability
4. CS: Current Sense Pin for Overload Protection
5. GND: Ground
6. DRAIN: Switching Transistor Drain Connection
7. SOURCE: Switching Transistor Source Connection

Functional Features

• Primary-Side Control: Eliminates the need for an optocoupler and secondary-side feedback components.
• Frequency Jittering: Reduces EMI emissions and improves system reliability.
• Auto-Restart Protection: Ensures continuous operation by automatically restarting after a fault condition is removed.
• Cycle-by-Cycle Current Limiting: Provides accurate overload protection.

Advantages

• High efficiency, reducing power consumption and heat dissipation.
• Low standby power, meeting energy-saving requirements.
• Wide input voltage range, suitable for various applications.
• Primary-side control simplifies circuit design and reduces component count.
• Auto-restart protection enhances system reliability.

Disadvantages

• Requires careful consideration of layout and noise filtering due to primary-side control.
• Limited output power compared to some other power management ICs.
• Higher cost compared to non-switching power supply solutions.

Working Principles

The TOP244FN is a primary-side control switching power supply controller. It operates by regulating the duty cycle of the switching transistor based on the feedback received from the output voltage. This eliminates the need for an optocoupler and secondary-side feedback components, simplifying the circuit design. The frequency jittering feature reduces electromagnetic interference (EMI) emissions, while the auto-restart protection ensures continuous operation by restarting the system after a fault condition is removed. The cycle-by-cycle current limiting provides accurate overload protection.

Detailed Application Field Plans

The TOP244FN is widely used in various applications, including:

1. Power Adapters: Provides efficient power conversion for laptops, smartphones, and other electronic devices.
2. LED Lighting: Enables high-efficiency LED drivers with low standby power consumption.
3. Industrial Power Supplies: Suitable for powering industrial equipment and machinery.
4. Home Appliances: Used in power supplies for refrigerators, air conditioners, and other household appliances.

Detailed and Complete Alternative Models

1. TOP245YN: Similar functionality with different pin configuration.
2. TOP246YN: Higher output power capability.
3. TOP247YN: Lower cost option with reduced features.

(Note: The above alternative models are from the same TOPSwitch family of products.)

This concludes the encyclopedia entry for TOP244FN, providing comprehensive information about its product category, basic overview, specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models.