ON Semiconductor
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KA3524
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KA3524

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage mode PWM controller for switching power supplies

Characteristics: - High frequency operation - Wide input voltage range - Adjustable output voltage - Current limiting protection - Over-temperature protection

Package: Dual in-line package (DIP)

Essence: The KA3524 is a versatile PWM controller designed for use in various switching power supply applications.

Packaging/Quantity: Available in tubes or reels, with 25 pieces per tube/reel.

Specifications

  • Input Voltage Range: 8V to 35V
  • Output Voltage Range: 1.25V to 30V
  • Maximum Duty Cycle: 100%
  • Oscillator Frequency Range: 100kHz to 500kHz
  • Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The KA3524 has 16 pins, which are assigned as follows:

  1. VCC: Power supply input
  2. GND: Ground reference
  3. COMP: Error amplifier output
  4. FB: Feedback input for regulating the output voltage
  5. RT/CT: Timing resistor and capacitor connection
  6. CT: Timing capacitor connection
  7. OSC: Oscillator timing capacitor connection
  8. OSC: Oscillator timing resistor connection
  9. SYNC: Synchronization input for multiple ICs
  10. DTC: Dead time control input
  11. INV: Inverting input of the error amplifier
  12. NC: No connection
  13. DRV: Gate driver output
  14. OUT: Switching power supply output
  15. CS: Current sense input
  16. VREF: Reference voltage output

Functional Features

  • Voltage mode control for stable regulation
  • Adjustable oscillator frequency for flexibility
  • Error amplifier for precise voltage regulation
  • Current limiting protection for overload conditions
  • Over-temperature protection for thermal management

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile applications - High frequency operation enables compact designs - Adjustable output voltage provides flexibility - Current limiting protection ensures system safety - Over-temperature protection prevents IC damage

Disadvantages: - Limited maximum duty cycle may restrict certain applications - Requires external components for complete power supply implementation

Working Principles

The KA3524 operates as a voltage mode PWM controller, where the error amplifier compares the feedback voltage with a reference voltage to generate an error signal. This error signal is then used to control the duty cycle of the output waveform, which regulates the output voltage. The oscillator sets the switching frequency, and the dead time control ensures proper timing between the high-side and low-side switches.

Detailed Application Field Plans

The KA3524 can be used in various switching power supply applications, including: - AC/DC converters - DC/DC converters - Battery chargers - LED drivers - Inverters

Detailed and Complete Alternative Models

Some alternative models to the KA3524 include: - UC3842: Similar voltage mode PWM controller with adjustable frequency - TL494: PWM controller with additional features like soft-start and shutdown - SG3524: PWM controller with built-in oscillator and error amplifier

These alternative models offer similar functionality and can be used as replacements for the KA3524 depending on specific requirements.

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Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af KA3524 i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of KA3524 in technical solutions:

  1. Q: What is KA3524? A: KA3524 is a pulse width modulation (PWM) controller IC commonly used in power supply applications.

  2. Q: What is the operating voltage range of KA3524? A: The operating voltage range of KA3524 is typically between 8V and 40V.

  3. Q: Can KA3524 be used for both step-up and step-down converters? A: Yes, KA3524 can be used for both step-up (boost) and step-down (buck) converters.

  4. Q: What is the maximum switching frequency supported by KA3524? A: The maximum switching frequency supported by KA3524 is typically around 500kHz.

  5. Q: Does KA3524 have built-in protection features? A: Yes, KA3524 includes various protection features such as overcurrent protection, thermal shutdown, and under-voltage lockout.

  6. Q: Can KA3524 be used in battery charging applications? A: Yes, KA3524 can be used in battery charging applications by controlling the charging current and voltage.

  7. Q: Is KA3524 suitable for high-power applications? A: KA3524 is generally more suitable for low to medium power applications, typically up to a few hundred watts.

  8. Q: Can KA3524 operate in a synchronized mode? A: Yes, KA3524 can operate in a synchronized mode with an external clock signal for multi-phase operation or reducing input ripple.

  9. Q: Are there any reference designs available for KA3524-based power supplies? A: Yes, many manufacturers provide reference designs and application notes for KA3524-based power supply circuits.

  10. Q: Can KA3524 be used in audio amplifier applications? A: While KA3524 is primarily designed for power supply applications, it can also be used in audio amplifier circuits for controlling the output stage.

Please note that the answers provided here are general and may vary depending on specific application requirements and circuit design considerations.