company blog about Recycle TI Gate Drivers:Half-Bridge Driver,Isolated Gate Driver,Low-Side Driver

Recycle TI Gate Drivers:Half-Bridge Driver,Isolated Gate Driver,Low-Side Driver

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I. Low-Side Gate Drivers: A Basic Drive Solution Suitable for Controlling Single-Channel Power Devices

Low-side gate drivers are the most fundamental and widely used type in the field of gate driving. Their core characteristic is that the source (or emitter) of the power device is directly grounded, with the driver and power device sharing a common ground. This eliminates the need for additional level-shifting or isolation circuits, resulting in a simple design and low cost, making them suitable for scenarios requiring the switching control of a single power device.

1. Core Operating Principles and Characteristics

The input of a low-side driver receives a low-voltage control signal (typically 3.3V or 5V) from a microcontroller (MCU) or DSP, whilst the output provides sufficient source/drain current to rapidly charge and discharge the gate capacitance of the power device, thereby enabling rapid turn-on and turn-off of the device. TI’s low-side gate drivers feature high output current, fast switching speeds and low quiescent current. Some models also integrate functions such as under-voltage lockout (UVLO), overcurrent protection and thermal shutdown, effectively enhancing system reliability and preventing damage to power devices caused by abnormal operating conditions.

Furthermore, TI’s low-side gate drivers support a wide input voltage range to accommodate the power supply requirements of various control circuits. They are compatible with a variety of power devices, including MOSFETs and IGBTs, and the output current can be flexibly selected according to the application, ranging from several hundred milliamps to tens of amperes, thereby meeting the drive requirements for low- to medium-power applications.

2. Typical Models and Application Scenarios

Classic models of TI’s low-side gate drivers include the UCC2751x, UCC2752x and UCC27x24 series. Among these, the UCC2751x series offers output currents of up to 5 A source/5 A drain, with a wide supply voltage range of 4.5 V to 18 V and switching delays as low as tens of nanoseconds, making it suitable for applications such as high-frequency switching power supplies, motor control and lighting drivers; The UCC27x24 series, on the other hand, focuses on high integration, incorporating built-in current-limiting protection and thermal shutdown functions, making it suitable for applications with high reliability requirements, such as automotive electronics and industrial automation.

Typical applications for low-side drivers are concentrated in the field of single-channel power switch control, such as DC-DC step-down converters, LED driver power supplies, speed control of small motors, and switch control in battery management systems (BMS). In these scenarios, low-side driver solutions enable stable power control with a minimalist circuit design, reducing system size and cost.

II. Half-Bridge Gate Drivers: Dual-Channel Coordinated Drive, Tailored to the Core Requirements of Half-Bridge Topologies

The half-bridge topology is one of the most commonly used topologies in power electronics systems. Comprising two power devices—a high-side and a low-side device—connected in series, it is widely used in inverters, motor drives, UPS systems and new energy charging stations. TI’s half-bridge gate drivers are specifically designed for half-bridge topologies. They integrate both high-side and low-side drive channels to enable coordinated control of the two devices, resolving the issue of level matching when driving the high-side device and enhancing the stability and efficiency of the topology’s operation.

1. Core Operating Principles and Characteristics

The key challenge in half-bridge gate drivers lies in driving the high-side power device—the source (or emitter) potential of the high-side device varies dynamically during circuit operation and cannot be directly grounded. Consequently, TI’s half-bridge drivers employ a bootstrap circuit solution, using a bootstrap diode and bootstrap capacitor to provide a floating power supply to the high-side drive channel, thereby ensuring reliable driving of the high-side device. Furthermore, the driver incorporates built-in dead-time control, allowing flexible adjustment of the conduction interval between the high-side and low-side devices. This prevents power supply short circuits caused by both devices conducting simultaneously, thereby enhancing system safety.

TI’s half-bridge gate drivers feature independent control of the high-side and low-side channels, symmetrical output current, high common-mode transient immunity (CMTI) and low switching delay. Some models also integrate functions such as bootstrap undervoltage protection, overcurrent protection and fault feedback, enabling real-time monitoring of circuit operating status and prompt reporting of fault information, thereby simplifying the design of system protection circuits. Furthermore, certain high-end models support programmable dead-time, adapting to the switching characteristics of different power devices and further optimising system switching losses.

2. Typical Models and Application Scenarios

Mainstream models of TI half-bridge gate drivers include the DRV8161, LM5108 and the DRV8350 series. Among these, the DRV8161 series comprises automotive-grade half-bridge drivers supporting 3.3V and 5V logic inputs. They integrate GVDD undervoltage, bootstrap undervoltage, MOSFET overcurrent protection and thermal shutdown functions, making them suitable for applications such as motor drives and on-board chargers in automotive electronics; The LM5108 is a compact half-bridge driver housed in a 3mm × 3mm package. With a 100V voltage rating and comprehensive interlock and transconductance protection features, it is suitable for space-constrained applications such as small inverters and industrial motor drives; The DRV8350 series comprises highly integrated three-phase half-bridge drivers with built-in current sense amplifiers and step-down regulators, specifically designed for three-phase brushless DC (BLDC) motors and widely used in industrial automation and new energy vehicle motor control applications.

The application scenarios for half-bridge gate drivers focus on power electronic systems utilising half-bridge and derivative topologies (such as full-bridge and three-phase bridge), including photovoltaic inverters, uninterruptible power supplies (UPS), new energy vehicle charging points, industrial servo motor drives and variable-frequency control in household appliances. In these applications, half-bridge drivers enable precise, coordinated control of dual power devices, reducing switching losses and enhancing system power density and operational efficiency.

III. Isolated Gate Drivers: Electrical Isolation Protection for High-Voltage Safety Applications

In high-voltage power electronics systems, there is a significant potential difference between the control circuit and the power circuit. If connected directly, high-voltage interference could damage the control circuit and even pose safety hazards. TI’s isolated gate drivers use an isolation barrier to electrically isolate the control side from the power side, enabling both the reliable transmission of control signals and the blocking of high-voltage interference and leakage current, thereby ensuring safe system operation. They represent the core driver solution for high-voltage, high-reliability applications.

1. Core Operating Principles and Characteristics

TI’s isolated gate drivers primarily utilise capacitive or magnetic isolation technologies to create the isolation barrier. Among these, capacitive isolation has become the mainstream solution due to its high integration, low power consumption and high CMTI. The isolation barrier can withstand isolation voltages of several thousand volts (e.g. 5.7 kVRMS), effectively blocking high-voltage interference and common-mode noise from the power side whilst ensuring low-latency transmission of control signals. Compared to non-isolated drivers, isolated drivers offer greater electrical safety and are suitable for driving power devices in high-voltage applications.

Key features of TI’s isolated gate drivers include high isolation voltage, high CMTI (exceeding 125 V/ns in some models), a wide temperature range, and comprehensive integrated protection functions. Some models support flexible configuration, allowing switching between dual low-side, dual high-side or half-bridge drive modes to accommodate various topology requirements; furthermore, automotive-grade isolated drivers comply with the AEC-Q100 standard, offering excellent vibration resistance and temperature adaptability to meet the stringent requirements of automotive electronics. Furthermore, these isolated drivers offer high output current capability, enabling them to drive high-power devices such as IGBTs and SiC FETs, making them suitable for high-voltage, high-power applications.

2. Typical Models and Application Scenarios

Representative models of TI’s isolated gate drivers include the UCC21530-Q1, UCC21521ADWR and UCC21732-Q1 series. The UCC21530-Q1 is an automotive-grade isolated driver; the input and output sides are isolated by a 5.7 kV rms reinforced isolation barrier, with a minimum CMTI of 125 V/ns. It supports three drive modes—half-bridge, dual low-side and dual high-side—and features integrated programmable dead-time functionality, making it suitable for applications such as high-voltage inverters and on-board chargers in new energy vehicles; The UCC21521ADWR utilises capacitive isolation technology, with an isolation voltage of up to 5700 Vrms and an output current of 4 A source/6 A drain. It features fast switching speeds and is suitable for applications such as industrial high-voltage variable-frequency drives and photovoltaic inverters; The UCC21732-Q1 integrates overcurrent protection and temperature monitoring functions, utilising isolated analogue-to-PWM conversion technology, and is suited to applications with extremely high reliability requirements, such as high-voltage motor drives and UPS systems.

The applications of isolated gate drivers are primarily concentrated in high-voltage, high-reliability sectors, including high-voltage systems in new energy vehicles (inverters, DC-DC converters), industrial high-voltage variable-frequency drives, photovoltaic and wind power inverters, high-voltage UPS systems, and medical equipment power supplies. In these applications, isolated drivers effectively isolate high- and low-voltage circuits, preventing damage to control circuits caused by high-voltage faults, whilst enhancing the system’s electromagnetic compatibility (EMC) and ensuring the safety of both equipment and personnel.