Power Integrations
L'immagine può essere rappresentativa.
Vedi le specifiche per i dettagli del prodotto.
TOP245F
vedi dettagli Schede tecniche

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

  1. VCC: Power Supply Voltage
  2. GND: Ground
  3. FB: Feedback Pin
  4. COMP: Compensation Pin
  5. CS: Current Sense Pin
  6. DRAIN: Power MOSFET Drain Pin
  7. SOURCE: Power MOSFET Source Pin
  8. 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:

  1. AC-DC Power Supplies
  2. LED Lighting Systems
  3. Consumer Electronics
  4. Industrial Equipment
  5. Telecommunications Devices
  6. Automotive Electronics

Detailed and Complete Alternative Models

  1. TOP246F: Similar specifications and features, different package (TO-220)
  2. TOP247F: Higher output power capability, similar specifications and features
  3. TOP248F: Lower output power capability, similar specifications and features
  4. 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.

Word count: 314 words

10 domande e risposte comuni relative all'applicazione di TOP245F nelle soluzioni tecniche

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

  1. Q: What is TOP245F? A: TOP245F is a highly integrated offline switcher IC (integrated circuit) designed for low-power applications.

  2. 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.

  3. 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.

  4. 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.

  5. Q: Does TOP245F require an external MOSFET for operation? A: Yes, TOP245F requires an external MOSFET to control the switching of the power supply.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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.