IRS21851C

Product Overview

• Category: Integrated Circuit
• Use: Motor Drive and Control
• Characteristics: High voltage, high-speed power MOSFET and IGBT driver
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Efficient and reliable motor drive and control solution
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Input Voltage Range: 10V to 20V
• Output Current: 2.5A
• Operating Temperature Range: -40°C to +125°C
• Isolation Voltage: 2500Vrms
• Propagation Delay: 200ns
• Undervoltage Lockout: 9.5V (typical)

Detailed Pin Configuration

The IRS21851C has a total of 8 pins:

1. VCC: Power supply for the internal circuitry
2. VB: Bootstrap supply voltage for high-side gate driver
3. HO: High-side gate driver output
4. LO: Low-side gate driver output
5. COM: Common connection for low-side gate driver and bootstrap capacitor
6. LIN: Logic input for low-side gate driver
7. HIN: Logic input for high-side gate driver
8. GND: Ground reference for the internal circuitry

Functional Features

• High voltage level shifting capability
• Integrated deadtime generation
• Under-voltage lockout protection
• Over-current protection
• Fault reporting output
• Miller clamp functionality

Advantages and Disadvantages

Advantages: - High voltage range allows compatibility with various motor types - Fast propagation delay enables precise motor control - Integrated protection features enhance system reliability - Fault reporting output aids in troubleshooting

Disadvantages: - Limited output current may not be suitable for high-power applications - Requires external bootstrap capacitor for high-side gate driver

Working Principles

The IRS21851C is designed to drive and control power MOSFETs and IGBTs in motor control applications. It utilizes high voltage level shifting techniques to provide efficient switching of these devices. The integrated deadtime generation ensures proper timing between the high-side and low-side drivers, preventing shoot-through current. Under-voltage lockout protection safeguards against insufficient supply voltage, while over-current protection prevents excessive current flow. The fault reporting output signals any detected faults, enabling prompt system diagnosis.

Detailed Application Field Plans

The IRS21851C finds extensive use in various motor drive and control applications, including:

1. Industrial automation systems
2. Electric vehicles
3. Robotics
4. HVAC (Heating, Ventilation, and Air Conditioning) systems
5. Appliances
6. Power tools

Detailed and Complete Alternative Models

1. IRS21850S: Similar features but with a different package (SOIC-16)
2. IRS21852C: Higher output current capability (4A)
3. IRS21853S: Enhanced protection features and higher isolation voltage (5000Vrms)

These alternative models offer flexibility in choosing the most suitable driver for specific application requirements.

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