company blog about Recycle TI GaN Power Stages:GaN Half-Bridge,GaN FET

Recycle TI GaN Power Stages:GaN Half-Bridge,GaN FET

Shenzhen Mingjiada Electronics Co., Ltd. is a globally renowned electronic component recycling company. By providing professional recycling services, we help customers realise the value of their idle electronic components; thanks to our strong financial standing and comprehensive service system, we have earned the long-term trust and cooperation of numerous manufacturing clients and traders.

Recycling Process:

1. Inventory Classification and Submission of Inventory List

Clients should first classify their idle stock, specifying the model, brand, date of manufacture, quantity, packaging type and condition. A detailed inventory list may be submitted to our valuation team via email or fax.

2. Professional Valuation and Quotation

Upon receipt of the inventory list, our company will complete a preliminary valuation and provide a quotation within 24 hours.

3. Contract Signing and Logistics Arrangements

Once the price has been agreed, a formal recycling contract will be signed to clarify the transaction details.

4. Goods Inspection and Prompt Payment

Upon arrival at our warehouse, the goods will undergo a final quality inspection. Upon passing the inspection, we guarantee payment within three working days to ensure a swift return of funds. Flexible payment methods include wire transfer, cash or other arrangements tailored to the client’s requirements.

I. Core Technical Characteristics of TI GaN Field-Effect Transistors

TI GaN field-effect transistors (GaN HEMTs) are enhancement-mode lateral gallium nitride power devices. Distinct from the vertical structure of traditional silicon MOSFETs, they leverage the wide bandgap properties of third-generation semiconductors to revolutionise power device performance at a fundamental physical level. They serve as the core building blocks for TI’s GaN half-bridge power stages.

1. Core Physical and Electrical Advantages

Firstly, zero reverse recovery loss. As GaN devices lack a PN junction structure, they do not exhibit the reverse recovery charge (Qrr) inherent in silicon MOSFETs. This completely eliminates reverse recovery losses in high-frequency hard-switching scenarios, allowing switching frequencies to easily exceed the MHz range. Compared to silicon devices, efficiency is improved by 3% to 8%, with even more significant gains under high-frequency operating conditions. Secondly, they feature ultra-low parasitic parameters; the device’s gate capacitance and output capacitance are extremely small, resulting in switching losses far lower than those of silicon MOSFETs of the same specification. This supports high-speed turn-on and turn-off whilst significantly reducing switching spike voltages and electromagnetic interference. Furthermore, they offer excellent on-state characteristics, with lower on-resistance for the same package size, which substantially reduces on-state losses and ensures efficiency under both light and full loads. Finally, high voltage rating and high switching speed: TI’s GaN FETs cover mainstream voltage ratings from 80 V to 650 V, making them suitable for a wide range of applications including low-voltage motor drives and medium- to high-voltage power conversion; their switching speed is 5 to 10 times faster than that of silicon devices.

2. Device Structure and Operating Principle

TI’s enhancement-mode GaN field-effect transistors employ a normally-off, normally-on control logic, regulating the conduction of the two-dimensional electron gas (2DEG) via gate voltage to achieve switching control of the power circuit. Compared to discrete silicon MOSFETs, TI’s GaN FETs feature optimised wafer processes and packaging layouts, which significantly reduce internal parasitic inductance and capacitance, thereby suppressing high-frequency switching oscillations at source. Furthermore, the devices support bidirectional conduction, enabling them to replace traditional diodes for reverse current flow, thereby simplifying power circuit topologies and reducing the number of external components.

II. Architecture and Operating Mechanism of TI’s GaN Half-Bridge Power Stage

The half-bridge topology is one of the most widely used fundamental architectures in the field of power conversion. Traditional discrete half-bridge circuits suffer from issues such as difficulty in device matching, high parasitic parameters in wiring, high risk of crosstalk, and complex debugging. TI’s integrated GaN half-bridge power stage highly integrates two GaN field-effect transistors, a dedicated gate driver, dead-time control circuitry, overcurrent/overtemperature/overvoltage protection circuits and a bootstrap circuit within a single package. It represents a standardised, highly reliable and mass-producible power stage solution that thoroughly resolves the numerous challenges associated with discrete half-bridge designs.

1. Architectural Composition

TI’s GaN half-bridge power stage integrates four core modules, featuring a highly streamlined structure and comprehensive functionality. Firstly, the high-side and low-side GaN FET pairs: two highly parameter-matched enhancement-mode GaN field-effect transistors are connected in series to form the half-bridge main power circuit, ensuring switching consistency between the upper and lower transistors and avoiding unbalanced load losses; Secondly, a dedicated high-frequency gate driver, optimised for the low gate capacitance and high-speed switching characteristics of GaN devices, provides precise gate drive voltage and current, eliminating common issues with GaN devices such as false triggering and oscillation; Thirdly, an intelligent dead-time control module with built-in adaptive dead-time sequencing logic automatically mitigates crosstalk between the high-side and low-side FETs without the need for complex external configuration, balancing safety and conversion efficiency; fourthly, a comprehensive set of protection circuits integrating overcurrent protection, thermal shutdown, gate overvoltage and undervoltage protection, and short-circuit protection, which significantly enhances the operational stability of the power stage. Some high-end models also integrate a bootstrap diode and bootstrap capacitor, further simplifying peripheral wiring.

2. Operating Principle and Timing Logic

The GaN half-bridge power stage operates in a complementary switching mode. A PWM control signal is input via an external controller and, after being processed by the internal driver, drives the high-side and low-side GaN FETs to conduct alternately. During operation, the internal dead-time control module inserts a minute dead-time at the moment of switching between the high-side and low-side FETs, thereby completely preventing a power supply short circuit caused by simultaneous conduction of both FETs. The high-side device employs a floating-ground drive architecture, utilising an integrated internal bootstrap circuit to provide a floating power supply, thereby meeting the voltage conversion requirements of high-voltage half-bridge applications; the low-side device utilises a ground-driven configuration, offering simple control logic and fast response times. At the output, the alternating switching of the high-side and low-side FETs converts the DC bus voltage into a high-frequency AC square-wave voltage. In conjunction with the downstream inductor and capacitor resonant network, this enables power conversion functions such as buck, boost and resonant conversion.

III. Core Technical Advantages of TI’s GaN Half-Bridge Power Stages

Compared to discrete silicon half-bridge and discrete GaN half-bridge solutions, TI’s integrated GaN half-bridge power stages offer comprehensive advantages across four key dimensions—performance, design, cost and reliability—making them ideally suited to the evolving requirements of high-frequency, high-density power equipment.

1. Exceptional efficiency and outstanding high-frequency performance

Leveraging the zero reverse recovery characteristics and ultra-low switching losses of GaN FETs, TI’s GaN half-bridge power stage supports high-frequency switching operation at 1 MHz to 10 MHz. Under high-frequency operating conditions, the volume and weight of passive components such as the output inductor and capacitor can be significantly reduced, increasing the power density of the equipment by more than 40 per cent. At the same time, with both conduction and switching losses optimised, efficiency is significantly improved across the entire load range, easily meeting the requirements for 80 Plus Titanium-level and industrial high-efficiency power supply standards, whilst effectively reducing the equipment’s operating power consumption and thermal management demands.

2. High integration, simplifying design and mass production

Traditional discrete half-bridge designs require separate matching of MOSFETs, drivers, bootstrap components and protection circuits. Component selection, parameter matching and PCB routing are extremely challenging, and at high frequencies, parasitic parameters can easily lead to oscillation and a sharp increase in losses. TI’s GaN half-bridge integrates all core power and control components into a single unit, eliminating the need for complex peripheral circuits. It operates with only a few filter capacitors, significantly lowering the hardware design barrier. The standardised integrated package ensures consistency in device parameters, avoids batch-to-batch variations typical of discrete components, improves mass production yield, and shortens the R&D cycle.

3. Low parasitic effects and low interference for enhanced stability

The integrated package utilises a dedicated power routing layout, which drastically reduces the trace lengths of both the power and drive circuits, minimising parasitic inductance and capacitance in the loops. This suppresses high-frequency switching spikes, voltage oscillations and electromagnetic interference at source. Compared to discrete solutions, excellent EMC performance can be achieved without the need for complex RC snubber circuits or ferrite bead filter circuits, simplifying system EMC design whilst reducing voltage stress on the devices and enhancing long-term operational reliability.

4. Intelligent protection, suitable for harsh operating conditions

The entire range of TI GaN half-bridge power stages incorporates comprehensive intelligent protection mechanisms that monitor the device’s operating status in real time. Overcurrent protection responds rapidly to short-circuit faults, switching off the power transistors within nanoseconds to prevent device destruction; over-temperature protection automatically shuts down the system when the chip junction temperature exceeds the threshold and automatically resets once the temperature returns to normal; gate voltage protection eliminates the risks of under-voltage false triggering and over-voltage breakdown. This comprehensive protection system enables the power stage to operate stably under harsh conditions such as high industrial temperatures, high-frequency transients and load fluctuations.

IV. Typical Devices in TI’s Mainstream GaN Half-Bridge Power Stage Portfolio

TI has established a comprehensive GaN half-bridge product portfolio tailored to different power ratings and voltage withstand requirements, covering a full range of applications including low-voltage motor drives, medium- and high-voltage power supplies, and new energy inverters. The key parameters and positioning of the core mainstream devices are as follows:

- LMG5200: An integrated GaN half-bridge power stage with a 80V voltage rating and 10A rated current, suitable for low-voltage, high-current applications. Primarily used in BLDC motor drives up to 36V, low-voltage high-frequency inverters and portable fast-charging power supplies, it features a compact package and extremely high integration, making it the preferred solution for low-voltage industrial control.

- LMG2100R026: A high-current GaN half-bridge power stage with a continuous voltage rating of 93V, a pulse voltage rating of 100V and a current rating of 53A. It features an extremely low on-resistance and excellent loss performance under high-current conditions, making it suitable for high-power low-voltage power supplies, industrial motor drives and low-voltage power stages in energy storage converters.

- LMG3410R070/LMG3422: 650V high-voltage GaN half-bridge power stages, specifically designed for medium- and high-voltage high-frequency power conversion. They support MHz-level soft-switching and hard-switching operating modes and are widely used in medium- and high-voltage high-efficiency applications such as totem-pole PFC, LLC resonant converters, server power supplies and PV micro-inverters, meeting Titanium-level energy efficiency standards.

V. Typical Application Scenarios

Leveraging their core advantages of high frequency, high efficiency, high integration and high reliability, TI’s GaN half-bridge power stages have become the core power stage solutions for the next generation of high-end power electronic equipment. Mainstream application scenarios span four major areas. Firstly, high-efficiency switching power supplies, including server power supplies, industrial power supplies and new energy fast-charging power supplies; high-frequency design reduces equipment size, improves full-load efficiency and meets high-end energy efficiency certification requirements; Second, new energy conversion equipment, used in photovoltaic micro-inverters, energy storage converters and on-board power supplies. The high-voltage GaN half-bridge architecture enables highly efficient energy conversion and reduces equipment energy consumption; third, motor drive systems, suitable for high-frequency drive applications in BLDC brushless motors and servo motors, where low-voltage, high-current GaN half-bridges enable precise speed control and low-loss operation; Fourthly, high-frequency resonant converters: in resonant topologies such as LLC and DCX, the high-speed switching characteristics of GaN devices enable soft-switching operation, completely eliminating switching losses and maximising power density.