The part number "UCC27424DR" corresponds to a specific product from Texas Instruments (TI). It is a dual high-speed, low-side MOSFET driver designed to drive Power MOSFETs in applications such as motor control, power conversion, and high-speed switching.
Package:
The "DR" suffix in the part number indicates the package type, which in this case is SOIC-8 (Small Outline Integrated Circuit). This package consists of 8 pins.
Pin Function Specifications for UCC27424DR:
Pin Number Pin Name Pin Type Pin Function Description 1 VDD Power Supply Positive supply voltage input (typically +10V to +20V). 2 COM Ground Ground pin, typically connected to the system ground. 3 IN1 Input Logic input to control the first MOSFET gate (logic level). 4 IN2 Input Logic input to control the second MOSFET gate (logic level). 5 nC1 Output Output for the first MOSFET gate drive (active low). 6 nC2 Output Output for the second MOSFET gate drive (active low). 7 VSS Ground System ground pin for the MOSFET driver circuit. 8 NC No Connect No connection, often not used or can be internally tied to VSS.Explanation of Pin Functions:
VDD (Pin 1): This is the supply voltage pin for the MOSFET driver. A positive voltage is applied here to power the internal circuitry of the UCC27424DR. Typically, this voltage is between 10V and 20V, and it powers the gate driver outputs (pins 5 and 6).
COM (Pin 2): This is the common ground pin for the circuit. It is essential to connect this pin to the system ground to complete the current path for the driver.
IN1 and IN2 (Pins 3 and 4): These are the input pins that control the MOSFETs. A high voltage (e.g., 3.3V or 5V) at these pins turns the respective MOSFET gate drive on, whereas a low voltage turns the gate drive off. These inputs are typically controlled by a logic signal from a microcontroller or similar device.
nC1 and nC2 (Pins 5 and 6): These are the output pins that provide the drive signals to the gates of the external MOSFETs. When the corresponding input pin (IN1 or IN2) is high, the output pin (nC1 or nC2) will drive the gate of the MOSFET low, turning it on. These are low-side outputs, meaning they are referenced to the ground (COM).
VSS (Pin 7): This pin is used for system grounding. It connects to the source of the MOSFETs or the lower side of the power supply.
NC (Pin 8): This is a "no connect" pin, meaning it does not have any electrical connection or function in the circuit. It is typically used for internal routing within the chip.
FAQs for UCC27424DR:
1. What is the supply voltage range for the UCC27424DR? The UCC27424DR requires a supply voltage between 10V and 20V for proper operation. 2. What is the function of the IN1 and IN2 pins? IN1 and IN2 are logic input pins that control the gate drive outputs, turning the external MOSFETs on and off. 3. What type of MOSFETs can the UCC27424DR drive? The UCC27424DR is designed to drive low-side MOSFETs in power conversion applications, typically in a half-bridge or full-bridge configuration. 4. What is the purpose of the COM pin? COM is the ground reference pin for the driver and needs to be connected to the system ground. 5. What is the significance of the VDD pin? VDD provides the positive supply voltage to the internal driver circuitry, enabling the gate drive outputs. 6. Can the UCC27424DR drive high-side MOSFETs? No, the UCC27424DR is designed for low-side MOSFETs only. For high-side MOSFETs, you would need a different driver, like a high-side driver or a bootstrap circuit. 7. What is the typical output voltage level on nC1 and nC2? The output voltage levels on nC1 and nC2 are typically close to the ground potential when turned on (low-side), and they will be pulled down to a low voltage when the MOSFETs are driven low. 8. What is the package type of the UCC27424DR? The UCC27424DR comes in an SOIC-8 package with 8 pins. 9. Can the UCC27424DR be used in a high-speed switching application? Yes, the UCC27424DR is designed for high-speed switching applications and can switch MOSFETs at high frequencies, making it suitable for motor control and power conversion. 10. How do I calculate the gate resistor for driving MOSFETs with the UCC27424DR? The gate resistor is typically chosen based on the desired switching speed and the gate charge of the MOSFET. A small resistor (e.g., 10Ω to 100Ω) is typically used to limit the inrush current and reduce ringing. 11. What is the maximum output current capability of the UCC27424DR? The UCC27424DR can provide up to 2A peak current to the gate of the MOSFETs, which is sufficient for driving most standard power MOSFETs. 12. Can the UCC27424DR be used in a low-voltage system? The UCC27424DR operates best with a supply voltage in the 10V to 20V range. It may not work efficiently in lower-voltage systems without proper design adjustments. 13. What is the typical delay time for the UCC27424DR? The UCC27424DR has low propagation delay, typically around 35ns, making it suitable for high-speed switching applications. 14. Can I use the UCC27424DR to drive a MOSFET directly from a microcontroller? Yes, you can use the IN1 and IN2 inputs to directly interface with a microcontroller to control the MOSFET gates, as long as the microcontroller output voltage is sufficient to turn the driver on (typically 3.3V or 5V logic). 15. What is the power dissipation of the UCC27424DR? The power dissipation of the UCC27424DR is relatively low, but it will depend on the switching frequency, gate charge of the MOSFETs, and supply voltage. 16. Is there any protection circuitry built into the UCC27424DR? The UCC27424DR includes some protection features, such as under-voltage lockout and short-circuit protection, to ensure safe operation. 17. Can I use the UCC27424DR for driving both N-channel and P-channel MOSFETs? The UCC27424DR is designed to drive N-channel MOSFETs in a low-side configuration. It is not suitable for driving P-channel MOSFETs directly. 18. What is the minimum input voltage required for the IN1 and IN2 pins? The IN1 and IN2 pins typically require a voltage of 3V or higher to turn on the respective MOSFET gate drive. 19. Can I use the UCC27424DR for single MOSFET drive? Yes, you can use the UCC27424DR to drive a single MOSFET in applications where a low-side driver is needed. 20. What is the maximum frequency that the UCC27424DR can switch at? The UCC27424DR can handle high-frequency switching, with a typical operating frequency of up to 1 MHz depending on the application and gate charge of the MOSFETs.This should provide a detailed breakdown of the UCC27424DR’s pin functions and FAQs. Let me know if you need further clarification or have additional questions!