Overview
The UCC21 520DWR is a dual-channel isolated gate driver from Texas Instruments (TI) designed for high-speed switching control applications of MOSFET, IGBT, and SiC power devices. This device integrates two independent isolated drive channels, supporting high-side and low-side power switching control, and can be used in half-bridge, full-bridge, three-phase inverters, and other isolated power conversion topologies.
The UCC21520DWR employs capacitive isolation technology, exhibiting high common-mode transient immunity (CMTI) and supporting a maximum peak source current of 4A and a peak sink current of 6A . It can rapidly drive external power MOSFETs, IGBTs, and SiC MOSFETs. The device has a wide operating voltage range and provides UVLO, enable control, and input fault protection, improving the stability and reliability of power conversion systems under high-speed switching conditions.
With its dual-channel integration, high-speed switching capability, and enhanced isolation performance, the UCC21520DWR is suitable for applications such as industrial power supplies, solar inverters, UPS, motor drives, server power supplies, EV charging equipment, and high-voltage DC/DC converters .
Core parameters
| Parameter | Value |
| Product Type | Dual-channel isolated gate driver |
| Manufacturer | Texas Instruments |
| drive channel | 2 channels |
| Peak source current | 4A |
| Peak sink current | 6A |
| Isolation technology | Capacitive isolation |
| Maximum propagation delay | 19ns |
| Common-mode transient immunity (CMTI) | Up to 125kV/µs |
| Output power range | 6.5V ~ 25V |
| Input voltage range | 3V ~ 5.5V |
| Isolation rated voltage | 5kVrms |
| Switching frequency | Up to MHz level |
| UVLO | support |
| Logical input | CMOS / TTL compatible |
| Operating temperature range | -40°C to +125°C |
| Encapsulation type | SOIC-16 |
| Packaging | Tape & Reel |
| Environmental standards | RoHS compliant |
Features
Dual-channel isolated gate drive
The UCC21520DWR integrates two independent isolated gate drive channels within a single package, allowing for separate control of two power switching devices. In a half-bridge configuration, the two channels can be used to drive the high-side and low-side MOSFETs or IGBTs respectively, thereby reducing the number of external drive devices and improving system integration.
The dual-channel architecture is also suitable for full-bridge and multiphase power conversion systems, and the drive signals can be configured according to the specific topology.
High peak drive current
The UCC21520DWR supports a maximum peak source current of 4A and a peak sink current of 6A , enabling rapid charging and discharging of the gates of external power devices .
Stronger gate drive capability can shorten the switching transition time of MOSFETs, IGBTs, or SiC MOSFETs, thereby reducing switching losses and supporting higher frequency power conversion designs.
High common-mode transient immunity
In high-voltage power conversion systems, the high-speed switching of power devices generates significant common-mode voltage variations. The UCC21520DWR features a CMTI of up to 125kV/µs , enabling reliable isolation between input and output signals under conditions of rapid voltage changes .
This characteristic is particularly important for high-voltage half-bridges, SiC power devices, and high-frequency inverters.
High-speed propagation response
The device features low propagation delay, enabling high-speed gate control in typical applications. Shorter signal delays help improve the timing accuracy of power device switching and reduce timing errors in high-speed PWM control systems.
For high-frequency topologies such as LLC, phase-shifted full-bridge, and dual active bridge (DAB), fast drive response can improve power switch control performance.
Wide range gate power supply
The UCC21520DWR’s output side supports a wide power supply range, allowing selection of the appropriate gate drive voltage based on the type of external power device.
Therefore, the same driver can be adapted to MOSFETs, IGBTs and some wide bandgap power devices of different specifications, improving the design flexibility of the power supply platform.
Integrated undervoltage lockout protection
The device integrates an Under Voltage Lockout (UVLO) function. When the drive supply voltage is lower than a specified threshold, the drive output is limited to a safe state, thereby preventing the power MOSFET or IGBT from being in a partially turned-on state when the gate drive voltage is insufficient.
This feature helps reduce conduction losses and device heat generation under abnormal operating conditions.
Typical application scenarios
Industrial power supply
The UCC21520DWR can be used for MOSFET or IGBT gate control in industrial AC/DC and DC/DC power supplies, providing isolated drive for high-voltage power stages.
Solar inverter
In photovoltaic inverters, this device can be used to drive high-voltage half-bridge, full-bridge, and three-phase inverter power stages, achieving electrical isolation between the controller and the high-voltage power devices.
UPS power supply
The UCC21520DWR can be used in the inverter bridge and power conversion stage of a UPS to drive IGBTs or MOSFETs and achieve high-voltage side power switching control.
Motor drive
The dual-channel isolated drive structure is suitable for industrial motor drivers and inverters. It can be used to control half-bridge power switches and work with PWM controllers to achieve motor speed regulation.
EV charging equipment
In electric vehicle charging stations and on-board charging systems, the UCC21520DWR can be used for isolated gate drive of high-voltage DC/DC and inverter power stages.
SiC Power Converter
SiC MOSFETs exhibit high-speed switching characteristics, placing higher demands on the propagation delay, CMTI, and peak drive capability of the gate driver. The UCC21520DWR can be used for isolated gate control in high-frequency SiC power conversion systems.
Server and communication power supply
This device can also be used to achieve isolated driving of high-side and low-side power devices in server power supplies, data center power supplies and communication infrastructure.
Comparative Advantage Analysis
| Performance indicators | UCC21520DWR | Common single-channel gate driver |
| drive channel | 2 channels | 1 channel |
| Isolation function | integrated | External components may be required |
| Peak source current | 4A | Typically lower |
| Peak sink current | 6A | Typically lower |
| CMTI | Up to 125kV/µs | Depending on the model |
| UVLO | support | Partial support |
| High-side drive | support | Depending on the architecture |
| Packaging | SOIC-16 | Depending on the model |
The main advantages of the UCC21520DWR are its dual-channel isolation, high peak gate drive current, high CMTI, and high-speed response . These characteristics meet the requirements of high-frequency, high-voltage power conversion systems for gate drivers, while reducing the need for external isolation devices and driver stage design.
Manufacturer Profile: Texas Instruments
Texas Instruments (TI) is a leading global manufacturer of analog and embedded semiconductors, with products covering power management, interfaces, amplifiers, data converters, microcontrollers, and gate drivers.
TI has a complete product portfolio in industrial power supplies, automotive electronics, and high-performance power management. The UCC series is an important power management and gate drive product line of TI, covering the driving needs of various power semiconductors such as MOSFETs, IGBTs, SiC, and GaN.
The UCC21520DWR is designed for systems requiring electrical isolation and high-speed power switching control, and is suitable for industrial power supplies, inverters, charging equipment, and high-voltage DC/DC conversion platforms.
Why choose UCC21520DWR?
● Dual-channel isolated gate drive, suitable for half-bridge and full-bridge topologies.
● Up to 4A peak source current and 6A peak sink current.
● Up to 125kV/µs CMTI, suitable for high-speed power switching.
● Low propagation delay, beneficial for high-frequency PWM control
● Supports MOSFET, IGBT, and SiC power devices
● Integrated UVLO for improved safety under abnormal power supply conditions
● 5kVrms isolation capability, meeting the isolation requirements of high-voltage power stages
● SOIC-16 package, suitable for industrial PCB design.
● Suitable for industrial power supplies, inverters, UPS, EV charging, and server power supplies.
Frequently Asked Questions (FAQ)
Q1: What type of chip is the UCC21520DWR?
The UCC21520DWR is a dual-channel isolated gate driver primarily used to drive external MOSFETs, IGBTs, and other power semiconductors. It provides electrical isolation between the control circuitry and the high-voltage power stage, and enables rapid gate charging and discharging through a large peak drive current.
Q2: Can the UCC21520DWR drive a SiC MOSFET?
Yes. The UCC21520DWR features high peak output current and high CMTI, and supports fast switching response, making it suitable for some SiC MOSFET power conversion applications. However, in actual design, the external drive scheme still needs to be selected based on the specific SiC MOSFET’s gate charge, recommended drive voltage, switching frequency, and negative voltage turn-off requirements.
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