TOP245F

Product Overview

Category: Integrated Circuit (IC)
Use: Power Management
Characteristics: High Efficiency, Low Standby Power, Wide Input Voltage Range
Package: TO-220, TO-263, DIP-8
Essence: Switching Power Supply Controller
Packaging/Quantity: Tape and Reel, 1000 units per reel

Specifications

Input Voltage Range: 85VAC to 265VAC
Output Power: Up to 150W
Frequency Range: 50kHz to 500kHz
Operating Temperature Range: -40°C to +125°C
Maximum Duty Cycle: 75%
Startup Current: 25µA
Quiescent Current: 4mA

Detailed Pin Configuration

VCC: Power Supply Voltage
GND: Ground
FB: Feedback Pin
COMP: Compensation Pin
CS: Current Sense Pin
DRAIN: Power MOSFET Drain Pin
SOURCE: Power MOSFET Source Pin
NC: No Connection

Functional Features

Primary-Side Regulation (PSR) Control
Built-in Over-Temperature Protection
Auto-Restart Mode for Fault Conditions
Frequency Modulation for EMI Reduction
Adjustable Line Undervoltage Lockout (UVLO)
Cycle-by-Cycle Current Limiting
Soft Start for Controlled Startup

Advantages

High Efficiency Conversion
Low Standby Power Consumption
Simplified Design with Few External Components
Wide Input Voltage Range for Universal Applications
Robust Protection Features for Enhanced Reliability

Disadvantages

Limited Output Power Capability
Requires External Components for Complete Power Supply Design
Higher Cost Compared to Linear Regulators

Working Principles

The TOP245F is a switching power supply controller that utilizes primary-side regulation (PSR) control. It operates by modulating the duty cycle of the power MOSFET to regulate the output voltage. The feedback pin (FB) senses the output voltage and adjusts the duty cycle accordingly. The compensation pin (COMP) allows for stability optimization by adjusting the loop response.

Detailed Application Field Plans

The TOP245F is commonly used in various applications, including:

AC-DC Power Supplies
LED Lighting Systems
Consumer Electronics
Industrial Equipment
Telecommunications Devices
Automotive Electronics

Detailed and Complete Alternative Models

TOP246F: Similar specifications and features, different package (TO-220)
TOP247F: Higher output power capability, similar specifications and features
TOP248F: Lower output power capability, similar specifications and features
TOP249F: Higher frequency range, similar specifications and features

Note: This is not an exhaustive list, and there are other alternative models available from various manufacturers.

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技術ソリューションにおける TOP245F の適用に関連する 10 件の一般的な質問と回答をリストします。

Sure! Here are 10 common questions and answers related to the application of TOP245F in technical solutions:

Q: What is TOP245F? A: TOP245F is a highly integrated offline switcher IC (integrated circuit) designed for low-power applications.
Q: What are the typical applications of TOP245F? A: TOP245F is commonly used in power supplies for various electronic devices such as TVs, monitors, set-top boxes, and LED lighting.
Q: What is the maximum output power that TOP245F can handle? A: The maximum output power of TOP245F depends on the specific design and external components used, but it can typically handle up to 45 watts.
Q: Can TOP245F operate with both AC and DC input voltages? A: No, TOP245F is specifically designed to work with AC input voltages ranging from 85VAC to 265VAC.
Q: Does TOP245F require an external MOSFET for operation? A: Yes, TOP245F requires an external MOSFET to control the switching of the power supply.
Q: Is TOP245F suitable for high-voltage applications? A: No, TOP245F is not recommended for high-voltage applications as it is designed for low-power applications with lower voltage requirements.
Q: Can TOP245F provide multiple outputs? A: No, TOP245F is a single-output device. If multiple outputs are required, additional circuitry or a different IC may be needed.
Q: What are the key features of TOP245F? A: Some key features of TOP245F include built-in frequency jittering for reduced EMI, cycle-by-cycle current limit, and thermal shutdown protection.
Q: Can TOP245F operate in a wide temperature range? A: Yes, TOP245F can operate within a temperature range of -40°C to 150°C, making it suitable for various environmental conditions.
Q: Are there any specific design considerations when using TOP245F? A: Yes, some design considerations include proper heat sinking, component selection, and following the recommended application circuit provided in the datasheet.

Please note that these answers are general and may vary depending on the specific application and design requirements. It is always recommended to refer to the datasheet and consult with technical experts for accurate information.