The model number "IRS21867STRPBF" refers to a specific integrated circuit (IC) from International Rectifier (now part of Infineon Technologies). It is a high-voltage, high-speed power MOSFET driver commonly used in applications such as motor control, power supplies, and other power electronics.
Pin Function Specifications and Circuit Principles
The IRS21867STRPBF comes in a SOIC-20 (Small Outline Integrated Circuit) package. This package includes 20 pins, and each pin has a specific function for the operation of the IC. Below is a detailed explanation of each pin's functionality.
Pin Function List (20 pins for SOIC-20 package)
Pin Number Pin Name Description 1 VSS Ground pin. Connect to system ground. 2 COM Common connection for low-side driver. Connect to system ground. 3 LO Low-side gate drive. Connect to the gate of the low-side MOSFET. 4 VSS Ground pin. Connect to system ground. 5 SD Shutdown pin. A low-level input shuts down the driver (low enables the driver). 6 HIN High-side input for PWM signals (logic control of the high-side MOSFET). 7 LIN Low-side input for PWM signals (logic control of the low-side MOSFET). 8 VDD Supply voltage for the logic circuits. Connect to a positive voltage source. 9 VBS Bootstrap voltage for high-side driver. Connect a capacitor to enable high-side operation. 10 HO High-side output to drive the gate of the high-side MOSFET. 11 VB Bootstrap capacitor connection for high-side driver. 12 LO Low-side gate drive. Connect to the gate of the low-side MOSFET. 13 VSS Ground pin. Connect to system ground. 14 NC No connection. Reserved for internal purposes or future use. 15 VSS Ground pin. Connect to system ground. 16 VS Source voltage for the high-side MOSFET. 17 VDD Supply voltage for the logic circuits. Connect to a positive voltage source. 18 HO High-side gate drive. Connect to the gate of the high-side MOSFET. 19 VS Source voltage for the high-side MOSFET. 20 VSS Ground pin. Connect to system ground.Circuit Principle Explanation
The IRS21867STRPBF is designed to drive MOSFETs in a half-bridge configuration, meaning it controls both the high-side and low-side MOSFETs. The low-side driver controls the gate of the low-side MOSFET, while the high-side driver controls the gate of the high-side MOSFET. The bootstrap capacitor (connected to pin 9) is used to provide the necessary voltage for the high-side MOSFET's gate drive. The SD pin is used to disable the device, and the logic inputs (HIN and LIN) control the switching of the MOSFETs.
20 FAQs with Detailed Answers
What is the main application of the IRS21867STRPBF? The IRS21867STRPBF is primarily used in high-voltage power switching applications like motor control, power supplies, and other power electronics. How many pins are there in the IRS21867STRPBF package? The IRS21867STRPBF comes in a 20-pin SOIC-20 package. What is the purpose of the LO pin? The LO pin is used for the low-side gate drive. It is connected to the gate of the low-side MOSFET to control its switching. What is the function of the VSS pin? The VSS pin is the ground connection for the IRS21867STRPBF. It should be connected to the system ground. What is the function of the VDD pin? The VDD pin is the supply voltage input for the logic circuits within the IRS21867STRPBF. It must be connected to a positive voltage source. How does the high-side driver get its voltage? The high-side driver uses a bootstrap capacitor connected to the VBS pin to provide the necessary voltage for the high-side MOSFET gate. What happens when the SD pin is low? When the SD pin is low, the driver is shut down, and the gate drivers are disabled, stopping the MOSFETs from switching. Can I connect the COM pin to the system ground? Yes, the COM pin is the common reference point for the low-side driver and should be connected to the system ground. What is the function of the HIN pin? The HIN pin receives the logic input for controlling the high-side MOSFET. It is used for PWM control signals.What is the function of the LIN pin?
The LIN pin receives the logic input for controlling the low-side MOSFET. It is used for PWM control signals.How do I drive the high-side MOSFET?
The high-side MOSFET is driven through the HO pin, which connects to the gate of the MOSFET.What is the purpose of the VB pin?
The VB pin is used to connect the bootstrap capacitor, which is necessary for high-side gate drive.What is the function of the NC pin?
The NC (No Connection) pin is reserved for internal use and has no external connection.What is the voltage range for the VDD pin?
The VDD pin typically requires a supply voltage in the range of 10V to 20V.How do I calculate the required bootstrap capacitor value for the IRS21867STRPBF?
The recommended value for the bootstrap capacitor (connected to the VBS pin) is typically between 0.1µF and 1µF.Can I use the IRS21867STRPBF for both low-side and high-side MOSFETs?
Yes, the IRS21867STRPBF is designed to drive both low-side and high-side MOSFETs in a half-bridge configuration.What is the maximum voltage that can be applied to the VS pin?
The maximum voltage for the VS pin is typically 600V.What is the switching frequency range for the IRS21867STRPBF?
The IRS21867STRPBF supports switching frequencies up to 500 kHz.Can I use the IRS21867STRPBF in applications that require high-speed switching?
Yes, the IRS21867STRPBF is designed for high-speed switching and is suitable for applications such as motor control and power supplies.How can I protect the IRS21867STRPBF from overvoltage conditions?
Overvoltage protection can be achieved by using external components such as Zener diodes or transient voltage suppressors ( TVS ) on the VS and VDD pins to clamp excessive voltages.This detailed description should help you understand the functionality and application of the IRS21867STRPBF IC, including all pin descriptions and common questions.