IR21531

Product Overview

Category: Integrated Circuit (IC)

Use: The IR21531 is a high-voltage, half-bridge gate driver IC designed for use in power electronics applications. It provides the necessary drive signals for the high-side and low-side MOSFETs in a half-bridge configuration.

Characteristics: - High voltage capability - Half-bridge configuration - Gate driver functionality - Suitable for power electronics applications

Package: The IR21531 is available in a compact and industry-standard 8-pin DIP (Dual Inline Package) or SOIC (Small Outline Integrated Circuit) package.

Essence: The essence of the IR21531 lies in its ability to efficiently drive high-voltage MOSFETs in a half-bridge configuration, enabling the control of power electronics systems.

Packaging/Quantity: The IR21531 is typically sold in reels or tubes containing multiple units, with quantities varying depending on the supplier.

Specifications

• Supply Voltage Range: 10V to 20V
• Output Current: 200mA (source/sink)
• Operating Temperature Range: -40°C to 125°C
• Propagation Delay: 150ns (typical)
• Maximum Duty Cycle: 50%
• Undervoltage Lockout (UVLO) Threshold: 9.5V (on), 7.6V (off)

Pin Configuration

The IR21531 features an 8-pin package with the following pin configuration:

1. VCC: Power supply voltage input
2. VB: Bootstrap capacitor voltage input
3. HO: High-side gate driver output
4. LO: Low-side gate driver output
5. VS: High-side floating supply return
6. COM: Common connection for bootstrap capacitor and logic ground
7. SD: Shutdown input (active low)
8. RT: Oscillator timing resistor connection

Functional Features

• High-voltage half-bridge gate driver
• Integrated bootstrap capacitor voltage supply
• Shutdown input for system control
• Internal oscillator with adjustable frequency
• UVLO protection for reliable operation

Advantages and Disadvantages

Advantages: - High-voltage capability enables use in power electronics applications - Compact package size for space-constrained designs - Integrated bootstrap capacitor simplifies circuit layout - UVLO protection enhances system reliability

Disadvantages: - Limited maximum duty cycle of 50% - Requires external components for complete functionality - Not suitable for applications requiring duty cycles beyond 50%

Working Principles

The IR21531 operates by generating the necessary drive signals to control the high-side and low-side MOSFETs in a half-bridge configuration. It utilizes an internal oscillator to generate the switching frequency and provides gate drive signals with appropriate timing and voltage levels.

When powered on, the IR21531 charges the bootstrap capacitor through the VB pin, which is used to provide the necessary voltage for driving the high-side MOSFET. The HO and LO pins deliver the gate drive signals to the respective MOSFETs, enabling efficient switching and control of the power electronics system.

Detailed Application Field Plans

The IR21531 finds application in various power electronics systems, including: - Switching power supplies - Motor drives - Inverters - Uninterruptible Power Supplies (UPS) - Solar inverters

Its high-voltage capability, integrated bootstrap capacitor, and reliable gate drive make it suitable for these applications, where efficient power conversion and control are essential.

Detailed and Complete Alternative Models

1. IR2155: Similar to IR21531, but with additional features such as fault protection and adjustable dead time.
2. IRS21844: Half-bridge gate driver IC with integrated current sensing and protection features.
3. MCP1407: High-speed MOSFET driver with adjustable dead time and UVLO protection.

These alternative models offer similar functionality to the IR21531, but may have additional features or different specifications that cater to specific application requirements.

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