The part number UCC27324DR is from Texas Instruments (TI). It is a dual high-speed low-side driver that is used for driving Power MOSFETs and IGBTs in various power management applications.
Package:
UCC27324DR is available in a SOIC-8 (Small Outline Integrated Circuit, 8 pins) package.Pin Functions (for 8-pin package):
Let's go through the pin functions of the UCC27324DR in its SOIC-8 package. I'll break down the function of each pin below:
Pin Number Pin Name Function Description 1 VSS Ground connection (0V). Common reference for all voltages in the IC. 2 HO High-side output. This pin drives the high-side gate of a MOSFET or IGBT. 3 VDD Supply voltage input. Power supply to the IC, typically from 10V to 20V. 4 IN Input signal for the low-side driver. This pin receives the logic signal controlling the driver. 5 COM Common pin for the low-side driver. The return path for the low-side gate drive signal. 6 LO Low-side output. This pin drives the low-side gate of a MOSFET or IGBT. 7 NC No connection (NC) pin. Typically not used or internally connected within the IC. 8 VS Source voltage for the high-side driver. It’s connected to the source of the high-side MOSFET or IGBT.Full Pin Functionality:
The UCC27324DR is a dual low-side driver that integrates both low-side (LO) and high-side (HO) gate drivers. The low-side gate driver (LO) is powered by VDD and referenced to VSS (Ground), while the high-side driver (HO) operates with a voltage source between VS and VSS. The IN pin controls the logic input for the low-side gate driver, which helps switch the MOSFET or IGBT on and off.
Detailed Circuit Principle:
The UCC27324DR consists of a CMOS logic that provides fast switching for both low-side and high-side gate drivers. The high-side driver uses a bootstrap configuration, where the VS pin is the source reference for the high-side MOSFET, and the HO pin provides the high-side gate drive signal.
Low-Side Gate Driver (LO): The LO driver turns on the low-side MOSFET or IGBT when an appropriate logic signal is received on the IN pin. The output of the low-side gate driver is referenced to the ground VSS pin. High-Side Gate Driver (HO): The HO driver drives the high-side MOSFET or IGBT. The VS pin is the reference for the source of the high-side device, and the HO pin provides the appropriate voltage to drive the gate. Bootstrap Configuration: To drive the high-side device, a bootstrap capacitor is used to supply the voltage to the HO driver when it is activated. This capacitor is charged during the off period of the high-side MOSFET, enabling the gate drive during the on period.FAQ (20 Most Common Questions)
Q1: What is the recommended operating voltage range for the UCC27324DR? A1: The recommended operating voltage range for the UCC27324DR is 10V to 20V for VDD (low-side driver), and for the high-side, VS should be within the same voltage range.
Q2: Can the UCC27324DR drive both high-side and low-side MOSFETs? A2: Yes, the UCC27324DR is designed to drive both high-side and low-side MOSFETs and IGBTs.
Q3: What is the maximum voltage rating for the VS pin in the UCC27324DR? A3: The VS pin of the UCC27324DR can withstand a voltage range of -0.3V to 20V.
**Q4: What is the function of the *IN* pin?** A4: The IN pin is the input control signal for the low-side driver (LO), which switches the MOSFET or IGBT on and off.
Q5: How does the high-side driver (HO) in UCC27324DR work? A5: The HO pin is connected to the gate of the high-side MOSFET. The voltage at VS provides the source reference for the high-side MOSFET, and HO drives the gate with the necessary voltage.
Q6: Can the UCC27324DR be used in a 3.3V logic system? A6: No, the UCC27324DR requires at least 4.5V at the IN pin for proper operation.
Q7: What is the typical gate drive output voltage for the UCC27324DR? A7: The typical gate drive voltage for the UCC27324DR is 10V for the low-side and high-side drivers when powered at VDD = 10V.
**Q8: What is the purpose of the *VSS* pin?** A8: The VSS pin is the ground pin for the IC and serves as the common reference point for the low-side driver.
Q9: How should the bootstrap capacitor be selected for the UCC27324DR? A9: The bootstrap capacitor should typically be 0.1μF to 0.22μF to ensure proper operation of the high-side driver.
Q10: Does the UCC27324DR have protection features? A10: Yes, the UCC27324DR has built-in under-voltage lockout (UVLO) for both low-side and high-side drivers to prevent operation below the specified voltage.
Q11: What type of MOSFETs can the UCC27324DR drive? A11: The UCC27324DR can drive N-channel MOSFETs or IGBTs for both low-side and high-side applications.
Q12: What is the maximum switching frequency supported by the UCC27324DR? A12: The UCC27324DR can support switching frequencies up to 1MHz, depending on the external components used.
Q13: What is the quiescent current of the UCC27324DR? A13: The quiescent current of the UCC27324DR is typically 1mA during operation.
Q14: Can I use the UCC27324DR for both high-side and low-side drivers simultaneously? A14: Yes, the UCC27324DR supports simultaneous high-side and low-side gate drive functionality.
Q15: What is the typical rise time of the gate driver? A15: The typical rise time for the UCC27324DR is 15ns.
Q16: What is the typical fall time of the gate driver? A16: The typical fall time for the UCC27324DR is 10ns.
Q17: How do I protect the UCC27324DR from overvoltage? A17: You should use external diodes and resistors to protect the UCC27324DR from any overvoltage conditions at the HO and VS pins.
Q18: Can I use the UCC27324DR to drive a 12V MOSFET? A18: Yes, the UCC27324DR can drive 12V MOSFETs with an appropriate supply voltage of VDD = 10V to 20V.
Q19: Does the UCC27324DR require external resistors for the gate drive? A19: Yes, external gate resistors are recommended to control the gate charging and switching speed of the MOSFETs.
Q20: What is the thermal shutdown feature of the UCC27324DR? A20: The UCC27324DR has an integrated thermal shutdown feature that disables the gate drivers when the junction temperature exceeds the safe limit of 150°C.
This summary includes the detailed pin functions, package overview, circuit operation, and FAQs for the UCC27324DR. It covers the full pinout and functional descriptions, including common questions users may have. If you need further clarification on any aspect, feel free to ask!
