UCC21540 - 4A/6A 5.7kVRMS Isolated Gate Driver | Texas Instruments
MPN： UCC21540 ✓ 啟用中UCC21540 概覽
An isolated gate driver is a specialized IC that provides galvanic isolation between a low-voltage controller and a high-voltage power stage, enabling safe, ground-loop-free switching of power transistors in the power-conversion hierarchy: gate driver -> isolated driver -> power management IC. The UCC21540 belongs to the UCC2154x family within TI's broad isolated gate driver portfolio, optimized for 10-12V driven MOSFETs and IGBTs.
Key features include 4-A/6-A peak drive strength, 5.7-kVRMS reinforced isolation per the capacitive isolation technology, a programmable-deadtime (DT) pin that prevents shoot-through in half-bridge configurations, a disable (DIS) pin for system-level fault shutdown, and an 8-V UVLO on the secondary-side supply. VDD on the output side operates from 6.5V to 18V, supporting both dual low-side and half-bridge topologies.
Technically, the device uses TI capacitive isolation technology, delivering fast propagation delay, low channel-to-channel matching error, and high common-mode transient immunity (CMTI), which is essential when switching at high frequency across large dv/dt events such as GaN half-bridge transitions. The dual-input configuration accepts both PWM-style inverting/non-inverting inputs for flexible control interfacing.
Typical applications include server and telecom power supplies, industrial motor drives, solar string inverters, and EV onboard chargers, where its combination of drive strength, deadtime control, and isolation robustness maximizes converter efficiency and reliability.
Design tip: keep the gate-drive loop compact, set the DT pin resistor for the deadtime your switches require, and respect creepage/clearance spacing on the PCB. According to TI, pricing and availability as of 2026-08-30.
直接替換替代品，適用於 UCC21540 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： UCC21540 （相同外形與佔位） — 差異在於 Package, Isolation Rating, Isolation Technology, Operating Temperature, Automotive Qualification.
UCC21540A
✅ 直接替換📋 參考替代品（不在目錄中）
UCC21540QDWKRQ1
✅ 直接替換✗ 缺貨
$2.21 / 單位
查看資料表 →UCC21521DWR
✅ 直接替換聯絡詢價
查看資料表 →UCC21520
✅ 直接替換聯絡詢價
查看資料表 →UCC21530Q-Q1
⚡ 相同封裝聯絡詢價
查看資料表 →NCD57000
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
UCC21540 最大額定值與電氣特性
| Output Current (Peak Source) | 4 A |
| Output Current (Peak Sink) | 6 A |
| Isolation Rating | 5.7 kVRMS (reinforced) |
| Number of Channels | 2 |
| Isolation Technology | Capacitive coupling |
| Secondary-Side UVLO | 8 V |
| Output-Side Supply Range (VDD) | 6.5 V to 18 V |
| Programmable Deadtime | Yes (DT pin) |
| Disable Pin | Yes (DIS) |
| Driven Devices | Power MOSFET, IGBT, GaN transistor |
| 封裝 | SOIC-16 (DW); DWK with 3.3-mm channel spacing |
| Channel-to-Channel Spacing (DWK) | 3.3 mm |
| Isolation Type | Reinforced / galvanic |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
UCC21540 腳位配置
| 腳位 1 | VCCI — Input-side supply voltage |
| 腳位 2 | GND — Input-side ground |
| 腳位 3 | INA — Input A (non-inverting channel A) |
| 腳位 4 | INB — Input B (inverting channel B) |
| 腳位 5 | DIS — Disable input - forces both outputs low |
| 腳位 6 | DT — Deadtime programming resistor pin |
| 腳位 7 | NC — No connect |
| 腳位 8 | NC — No connect |
| 腳位 9 | NC — No connect |
| 腳位 10 | VDDA — Output-side supply channel A |
| 腳位 11 | OUTA — Gate drive output A |
| 腳位 12 | VEEA/COM — Output-side ground / negative rail channel A |
| 腳位 13 | VEEB/COM — Output-side ground / negative rail channel B |
| 腳位 14 | OUTB — Gate drive output B |
| 腳位 15 | VDDB — Output-side supply channel B |
| 腳位 16 | NC — No connect |
典型應用
UCC21540 適用於 6 應用s: Server and Telecom Power Supplies, Solar String Inverters, Industrial Motor Drives, EV Onboard Chargers and OBC Power Stages, GaN-Based High-Frequency Converters, Isolated DC-DC and Bias Supplies.
Server and Telecom Power Supplies
The UCC21540's 4-A/6-A peak drive and 5.7-kVRMS reinforced isolation make it ideal for LLC and phase-shifted full-bridge stages in server PSUs and telecom rectifiers. Its dual channels in one package drive the half-bridge pair with the DT pin enforcing shoot-through protection, while the 8-V UVLO guarantees full MOSFET enhancement before switching begins. Capacitive isolation adds no switching noise to the control ground, and the DIS pin enables fast system-level fault shutdown per PMBus protection schemes.
推薦
Solar String Inverters
In solar string inverters, the UCC21540 isolates the low-voltage MCU from the high-voltage IGBT or SiC power stage while providing the 4-A/6-A drive needed for efficient hard switching. The programmable deadtime allows tailoring to IGBT tail-current requirements, minimizing cross-conduction at the 400-800V DC bus. The 5.7-kVRMS reinforced isolation rating and wide creepage DWK option support grid-tied safety isolation, and high CMTI tolerates dv/dt events from the switching nodes.
推薦
Industrial Motor Drives
For three-phase industrial motor drives, the UCC21540 drives the IGBT/MOSFET half-bridges of inverter legs with reinforced isolation between control electronics and the high-voltage DC bus. The 6-A sink current enables fast turn-off to limit short-circuit energy, while the DT pin prevents leg shoot-through during PWM commutation. The DIS pin provides a hardware path to disable all outputs during faults such as overcurrent trips detected by shunt or hall sensors.
推薦
EV Onboard Chargers and OBC Power Stages
EV onboard chargers use totem-pole PFC and CLLLC resonant stages where the UCC21540's high CMTI capacitive isolation and 4-A/6-A drive handle fast-switching superjunction MOSFETs and SiC devices. The automotive-grade UCC21540-Q1 variant carries AEC-Q100 qualification for the vehicle environment. The programmable deadtime is tuned per switch technology, and the 6.5-18V VDD range accepts standard isolated bias rails used across the power stages.
推薦
GaN-Based High-Frequency Converters
GaN half-bridges switching at hundreds of kHz to MHz generate extreme dv/dt; the UCC21540's capacitive isolation barrier with high CMTI maintains signal integrity across these transitions. The UCC21540A variant with 5-V UVLO matches the lower gate-drive rails typical of GaN FETs, while the 4-A source/6-A sink current keeps switching transition times short to minimize overlap losses. A compact gate loop with the DT interlock remains essential at these frequencies.
推薦
Isolated DC-DC and Bias Supplies
Auxiliary power converters in industrial systems use the UCC21540 to drive transformer-coupled push-pull or half-bridge primary switches with controller isolation. The dual-channel configuration drives both switches from one package with matched propagation delay, simplifying symmetric duty-cycle control. The 8-V UVLO ensures clean startup from bias rails, and the DIS pin enables orderly shutdown coordinated with system power sequencing controllers.
推薦
推薦產品摘要
工程參考資料，適用於 UCC21540 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | UCC21540A | UCC21521DWR | UCC21520 | NCD57000 |
|---|---|---|---|---|---|
| Package | SOIC-16 (DW/DWK) | SOIC-16 (DW) - same | SOIC-16 (DW) - same | SOIC-16 (DW) - same | SOIC-16 (W) - footprint verify |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
| Programmable Deadtime | Yes (DT pin) | Yes (DT pin) | Yes (DT pin, slight family difference) | Yes (DT pin) | No (single channel) |
| Channels | 2 (dual) | 2 | 2 | 2 | 1 |
主要差異化特點
- 8-V UVLO optimized for 10-12V MOSFET/IGBT drive with cost advantage (對比UCC21520)
- 5-V UVLO GaN-friendly upgrade available in same footprint (對比UCC21540A)
- Dual channels with programmable deadtime in one isolated package (對比NCD57000)
- Automotive path with same family (對比UCC21540A)
設計說明
Keep the gate-drive loop as compact as possible: route OUTA/OUTB to the MOSFET gates with minimal inductance and place the gate return resistor close to the driver. Respect creepage and clearance spacing between primary and secondary sides on the PCB per the reinforced isolation rating of 5.7 kVRMS; the DWK package requires maintaining its 3.3-mm channel-to-channel spacing benefit through correct land pattern design.
Decouple VCCI with a 0.1uF ceramic close to pin 1, and decouple VDDA/VDDB each with 0.1uF plus 1-10uF bulk capacitors. The 8-V UVLO means the output-side bias must rise above 8 V before switching begins; size the bias supply (e.g., UCC25800-based flyback) to hold VDD in the 6.5-18V range under transient load steps of 4-A/6-A gate pulses.
Set the DT pin resistor for the deadtime your switch technology requires - IGBTs need longer deadtime for tail current, GaN needs minimal deadtime. Do not leave DIS floating; tie it to GND (inactive) through a pulldown. Note the channel B input is inverting in the typical half-bridge configuration - verify logic polarity against the datasheet truth table before layout.
High CMTI handling depends on a clean reference: connect the input-side GND to a quiet analog ground, and avoid routing high-dv/dt switching nodes under the isolation barrier. Add a small RC snubber on the gate if ringing at turn-off exceeds the gate voltage rating of the MOSFET or GaN device.
合規資訊
RoHS compliant per TI product listing. The UCC21540-Q1 variant provides automotive-grade operation with wide temperature range per TI product page.
