TL4581P

Product Overview

Category: Integrated Circuit (IC)

Use: TL4581P is a voltage mode PWM controller IC used in power supply applications.

Characteristics: - TL4581P operates at a high frequency, making it suitable for switching power supplies. - It provides precise regulation of output voltage and current. - The IC offers protection features such as overvoltage and overcurrent protection. - TL4581P has a wide input voltage range, allowing it to be used in various power supply designs.

Package: TL4581P is available in a standard 8-pin dual in-line package (DIP).

Essence: TL4581P is designed to control the pulse width modulation (PWM) signal in power supply circuits, ensuring stable and efficient power delivery.

Packaging/Quantity: TL4581P is typically sold in reels or tubes containing multiple units. The exact quantity depends on the supplier.

Specifications

• Input Voltage Range: 7V to 40V
• Output Voltage Range: Adjustable, typically up to 36V
• Maximum Output Current: 1A
• Switching Frequency: 100kHz to 500kHz
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The TL4581P IC has the following pin configuration:

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| | --| VCC GND |-- Pin 1: Power Supply --| COMP FB |-- Pin 2: Feedback Input --| CS OUT |-- Pin 3: Current Sense / Output --| RT CT |-- Pin 4: Timing Components --| EN INV |-- Pin 5: Enable / Inverting Input --| SS NC |-- Pin 6: Soft Start / Not Connected --| REF OSC |-- Pin 7: Reference Voltage / Oscillator --| UVLO NC |-- Pin 8: Undervoltage Lockout / Not Connected |___________| ```

Functional Features

• Voltage Mode PWM Control: TL4581P utilizes voltage mode control to regulate the output voltage of the power supply.
• Soft Start Function: The soft start pin (SS) allows for a gradual increase in output voltage during startup, reducing stress on components.
• Current Sense and Limiting: The current sense pin (CS) monitors the output current and provides overcurrent protection by limiting the duty cycle.
• Enable and Shutdown Capability: The enable pin (EN) can be used to turn the IC on or off, allowing for power saving and system control.
• Reference Voltage and Oscillator: The reference voltage pin (REF) provides a stable voltage reference for precise regulation, while the oscillator pin (OSC) sets the switching frequency.

Advantages and Disadvantages

Advantages: - High-frequency operation enables compact and efficient power supply designs. - Precise regulation ensures stable output voltage and current. - Protection features safeguard against overvoltage and overcurrent conditions. - Wide input voltage range allows for versatile application possibilities.

Disadvantages: - Limited maximum output current may not be suitable for high-power applications. - Requires external timing components (RT and CT) for setting the switching frequency.

Working Principles

TL4581P operates based on the voltage mode control technique. It compares the feedback voltage from the output with a reference voltage to generate an error signal. This error signal is then processed to adjust the duty cycle of the PWM signal, which controls the power delivered to the load. By continuously monitoring and adjusting the duty cycle, TL4581P maintains the desired output voltage and current levels.

Application Field Plans

TL4581P finds applications in various power supply designs, including but not limited to: - Switching Mode Power Supplies (SMPS) - DC-DC Converters - LED Drivers - Battery Chargers

Alternative Models

Some alternative models that can be considered as alternatives to TL4581P are: - UC3842 - SG3525 - TL494 - MC34063

These models offer similar functionality and can be used depending on specific design requirements.

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