TOP245GN-TL

Product Overview

• Category: Integrated Circuit
• Use: Power Management
• Characteristics: High Efficiency, Low Standby Power, Wide Input Voltage Range
• Package: TO-220
• Essence: Switching Power Supply Controller
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 85VAC to 265VAC
• Output Power: Up to 45W
• Switching Frequency: 66kHz to 132kHz
• 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. GND: Ground
3. FB: Feedback Pin for Output Voltage Regulation
4. COMP: Compensation Pin for Loop Stability
5. DRAIN: Drain Pin for External MOSFET
6. SOURCE: Source Pin for External MOSFET
7. CS: Current Sense Pin for Overload Protection
8. SYNC: Synchronization Pin for Multiple ICs

Functional Features

• Primary-Side Regulation (PSR): Eliminates the need for an optocoupler and secondary-side feedback components.
• Frequency Jittering: Reduces EMI emissions and improves system reliability.
• Auto-Restart: Automatically restarts the power supply after a fault condition is removed.
• Cycle-by-Cycle Current Limiting: Provides accurate current limiting for overload protection.

Advantages and Disadvantages

Advantages

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

Disadvantages

• Requires an external MOSFET for operation.
• Limited output power compared to higher-rated controllers.
• Higher switching frequency may require additional EMI filtering.

Working Principles

The TOP245GN-TL is a primary-side regulated switcher that operates in a flyback topology. It uses a control algorithm to regulate the output voltage by adjusting the duty cycle of the power switch. The feedback pin (FB) senses the output voltage and provides feedback to the controller, which adjusts the duty cycle accordingly. The compensation pin (COMP) is used to stabilize the control loop and ensure proper transient response.

During operation, the controller continuously monitors the current flowing through the external MOSFET by sensing the voltage drop across the current sense resistor connected to the CS pin. If the current exceeds a set limit, the controller initiates cycle-by-cycle current limiting to protect the system from overload conditions.

Detailed Application Field Plans

The TOP245GN-TL is widely used in various applications, including:

1. AC/DC Power Supplies: Provides efficient power conversion for consumer electronics, industrial equipment, and lighting applications.
2. LED Lighting: Enables high-efficiency LED drivers with low standby power consumption.
3. Home Appliances: Used in power supplies for refrigerators, air conditioners, and other household appliances.
4. Industrial Controls: Provides reliable power management for motor drives, control systems, and automation equipment.

Detailed and Complete Alternative Models

• TOP246GN: Similar specifications and features, but with higher output power capability.
• TOP247GN: Similar specifications and features, but with lower output power capability.
• TOP248GN: Similar specifications and features, but with additional protection features.

(Note: This is not an exhaustive list; there are several alternative models available in the same product family.)

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