UCC21540 - 4A/6A 5.7kVRMS Isolated Gate Driver | Texas Instruments
MPN: UCC21540 ✓ AktifUCC21540 Genel Bakış
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.
Drop-in alternatifler için UCC21540 — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller UCC21540 (aynı form faktörü ve ayağa oturma) — farklı olan Package, Isolation Rating, Isolation Technology, Operating Temperature, Automotive Qualification.
UCC21540A
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
UCC21540QDWKRQ1
✅ Yerleştirme✗ Stokta Yok
$2.21 / Birim
Veri Şablonunu Görüntüle →UCC21521DWR
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →UCC21520
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →UCC21530Q-Q1
⚡ Aynı PaketFiyat için iletişime geçin
Veri Şablonunu Görüntüle →NCD57000
⚡ Aynı Paket ⚠️ Onaylanmamış Özellikler📋 Katalogda Olmayan Referans Alternatifi
UCC21540 Maksimum Değerlendirmeler & Elektriksel Özellikler
| 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 |
| Paket | SOIC-16 (DW); DWK with 3.3-mm channel spacing |
| Channel-to-Channel Spacing (DWK) | 3.3 mm |
| Isolation Type | Reinforced / galvanic |
| Montaj Türü | Surface Mount |
| RoHS Durumu | Compliant |
UCC21540 Pin Yapısı
| Pin 1 | VCCI — Input-side supply voltage |
| Pin 2 | GND — Input-side ground |
| Pin 3 | INA — Input A (non-inverting channel A) |
| Pin 4 | INB — Input B (inverting channel B) |
| Pin 5 | DIS — Disable input - forces both outputs low |
| Pin 6 | DT — Deadtime programming resistor pin |
| Pin 7 | NC — No connect |
| Pin 8 | NC — No connect |
| Pin 9 | NC — No connect |
| Pin 10 | VDDA — Output-side supply channel A |
| Pin 11 | OUTA — Gate drive output A |
| Pin 12 | VEEA/COM — Output-side ground / negative rail channel A |
| Pin 13 | VEEB/COM — Output-side ground / negative rail channel B |
| Pin 14 | OUTB — Gate drive output B |
| Pin 15 | VDDB — Output-side supply channel B |
| Pin 16 | NC — No connect |
Tipik Uygulamalar
UCC21540 için uygundur 6 uygulamas: 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.
Önerilen
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.
Önerilen
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.
Önerilen
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.
Önerilen
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.
Önerilen
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.
Önerilen
Önerilen Ürünler Özeti
Mühendislik referans verileri: UCC21540 — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | 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 |
Ana Farklılayıcılar
- 8-V UVLO optimized for 10-12V MOSFET/IGBT drive with cost advantage (karşılaştırma:UCC21520)
- 5-V UVLO GaN-friendly upgrade available in same footprint (karşılaştırma:UCC21540A)
- Dual channels with programmable deadtime in one isolated package (karşılaştırma:NCD57000)
- Automotive path with same family (karşılaştırma:UCC21540A)
Tasarım Notları
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.
Uyumluluk Bilgisi
RoHS compliant per TI product listing. The UCC21540-Q1 variant provides automotive-grade operation with wide temperature range per TI product page.
