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FAN9673Q

15v Lqfp-32(7x7)

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Overview of FAN9673Q

The FAN9673Q is a critical conduction mode (CRM) PFC controller IC designed for use in power factor correction (PFC) applications in switched-mode power supplies (SMPS). This IC provides a compact and efficient solution for achieving high power factor and low total harmonic distortion in power supply designs.

Pinout

(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

  • VCC: Positive Power Supply
  • VREF: Reference Voltage Output
  • COMP: Error Amplifier Output
  • FB: Feedback Pin
  • RT/CLK: Oscillator Resistor/Clock
  • SS/EN: Soft-Start/Enable
  • CS: Current Sense Input
  • SENSE: Voltage Sense Input
  • UVLO: Under Voltage Lockout
  • GND: Ground

Circuit Diagram

Incorporate a circuit diagram that illustrates the connections and operation of the FAN9673Q for a more visual representation.

Key Features

  • Critical Conduction Mode (CRM) Control: The FAN9673Q utilizes CRM control to achieve high power factor and low THD in power supplies.
  • Programmable Internal Slope Compensation: This feature enables flexible design optimization to meet different system requirements.
  • Soft-Start Function: The integrated soft-start function reduces inrush current during startup, enhancing system reliability.
  • Accurate Voltage and Current Sense Inputs: The FAN9673Q provides precise voltage and current sensing for optimal PFC performance.
  • Wide Operating Voltage Range: The IC supports a wide input voltage range, making it suitable for various power supply applications.

Note: For detailed technical specifications, please refer to the FAN9673Q datasheet.

Application

  • Switched-Mode Power Supplies: The FAN9673Q is commonly used in PFC circuits within SMPS for applications including LED lighting, consumer electronics, and industrial power supplies.
  • Power Factor Correction: This IC is specifically designed for implementing power factor correction functionality to ensure compliance with power quality standards.
  • High-Efficiency Power Supplies: The FAN9673Q enables the design of high-efficiency power supplies with improved power factor and reduced THD.

Functionality

The FAN9673Q integrates critical conduction mode control to enable high power factor correction and low harmonic distortion, essential for efficient and compliant power supply designs.

Usage Guide

  • Power Supply: Connect VCC (Pin 1) to the positive power supply and GND (Pin 10) to ground.
  • Feedback: Connect FB (Pin 4) to the feedback network to regulate the output voltage.
  • Current Sensing: Utilize the CS (Pin 7) input for accurate current sensing in the PFC circuit.

Frequently Asked Questions

Q: What is critical conduction mode (CRM) control?
A: CRM control allows the FAN9673Q to regulate the PFC stage for optimal power factor and reduced THD by operating the boost converter in critical mode.

Q: Can the FAN9673Q be used in LED driver applications?
A: Yes, the FAN9673Q is suitable for LED driver applications, providing efficient PFC functionality for LED lighting systems.

Equivalent

For similar functionalities, consider these alternatives to the FAN9673Q:

  • FAN9611: Another PFC controller IC offering similar features and performance for power factor correction in SMPS designs.
  • UCC28180: This PFC controller IC provides advanced features for high-performance power factor correction and can be an alternative to the FAN9673Q.
  • IR1150: A critical conduction mode PFC controller IC that can serve as an alternative for PFC applications in SMPS.

Specifications

The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Status Active Compliance PbAHP
Package Type LQFP-32 Case Outline 561AB
MSL Type 3 MSL Temp (°C) 260
Container Type JTRAY Container Qty. 2500
ON Target Y PFC Mode CCM
Frequency Operation Fixed Control Mode Current Mode
Topology Step-Up fSW Typ (kHz) 40 / 75
VCC Max (V) 30 Drive Cap. (mA) 470 / 550
UVLO (V) 12.8 Latch No
UVP Yes Inhibition No
Pricing ($/Unit) $3.1101Sample

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