Microchip TC4428EOA713 High-Speed MOSFET Driver: Datasheet, Application Circuit, and Key Features
In the world of power electronics, efficiently switching power MOSFETs and IGBTs is a fundamental challenge. These components require significant current to charge and discharge their gate capacitances rapidly. A dedicated MOSFET driver IC, like the Microchip TC4428EOA713, is essential for this task, ensuring fast switching, reduced heat dissipation, and improved system reliability.
This article provides a detailed overview of the TC4428EOA713, exploring its key specifications, a typical application circuit, and its most critical features.
Key Features of the TC4428EOA713
The TC4428EOA713 is a dual, inverting, high-speed MOSFET driver from Microchip. It is part of a family of drivers known for their robustness and performance. Its standout characteristics include:
High Peak Output Current: With the ability to source and sink 1.5A of peak current, the TC4428 can swiftly charge and discharge large capacitive loads, minimizing switch transition times.
Fast Switching Speeds: It features exceptionally low rise and fall times of 25ns (typical) into a 1,000 pF load. This high-speed operation is crucial for high-frequency switching power supplies and applications where switching losses must be minimized.
Wide Operating Voltage Range: The device can operate from a single power supply ranging from 4.5V to 18V, making it compatible with various logic levels (e.g., 5V, 12V, 15V) and different MOSFET technologies.
Dual Inverting Channels: The IC contains two independent drivers. Each channel provides inverting functionality, meaning the output state is the logical inverse of the input state.
Low Output Impedance: A very low output impedance (typically 7Ω) ensures strong drive strength and helps prevent spurious triggering of the MOSFET.
Latch-Up Protected: The design is immune to latch-up, enhancing its durability in harsh electrical environments.
Available in 8-Pin SOIC Package: The TC4428EOA713 is offered in a small-outline IC (SOIC) package, which is suitable for space-constrained applications.
Typical Application Circuit
A standard application circuit for one channel of the TC4428EOA713 is straightforward, yet effective. The core principle involves placing the driver between a low-power PWM source (like a microcontroller) and the gate of a power MOSFET.
1. Power Supply (Vdd): A bypass capacitor (typically 1µF to 10µF tantalum or electrolytic) must be placed as close as possible between the Vdd pin (Pin 6) and ground (Pin 4). A smaller ceramic capacitor (100nF) in parallel is highly recommended to handle high-frequency current demands.
2. Input Signal: The PWM signal from the controller is connected directly to the input pin (e.g., Pin 2 for Channel 1). The input is TTL/CMOS compatible.
3. Output to MOSFET Gate: The output pin (e.g., Pin 7) is connected directly to the gate of the MOSFET. To prevent oscillations and control the switching speed, a small series resistor (a "gate resistor," typically between 5Ω and 100Ω) is often inserted in series with the gate.
4. Ground Connection: A solid, low-impedance ground connection is critical for stable operation. The ground pin (Pin 4) must be connected to the common ground plane of the system.
Note: Since the driver is inverting, a logic HIGH input will result in a LOW output, turning the MOSFET OFF, and vice versa. If non-inverting behavior is required, a second driver channel can be cascaded to double-invert the signal.
Datasheet Overview
The manufacturer's datasheet is the ultimate source of truth for any component. For the TC4428EOA713, the datasheet provides comprehensive information, including:
Absolute Maximum Ratings: The limits for supply voltage, input voltage, and power dissipation that must not be exceeded.
Electrical Characteristics: Detailed tables with parameters like quiescent current, output resistance, and threshold voltages under specific test conditions.
Timing Diagrams: Visual representations of propagation delays and rise/fall times.
Truth Table: Clarifies the inverting logic of the inputs and outputs.
Package Outline Dimensions: Mechanical drawings for PCB layout.
ICGOODFIND: The Microchip TC4428EOA713 is a robust and versatile high-speed MOSFET driver that significantly enhances switching performance in power conversion circuits. Its high peak current, fast switching speeds, and wide operating voltage range make it an excellent choice for applications such as switch-mode power supplies (SMPS), motor controllers, pulse transformers, and any circuit requiring precise and powerful control of MOSFETs or IGBTs.
Keywords: MOSFET Driver, High-Speed Switching, Gate Driving, TC4428, Inverting Driver.
