UCC21540 - 4A/6A 5.7kVRMS Isolated Gate Driver | Texas Instruments
Référence : UCC21540 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $3.2 | $3,20 |
| 10 | $2.9 | $29,00 |
| 100 | $2.45 | $245,00 |
| 500 | $2.1 | $1 050,00 |
| 1 000 | $1.85 | $1 850,00 |
UCC21540 Présentation
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.
Alternatives de remplacement direct pour UCC21540 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec UCC21540 (même facteur de forme et même empreinte) — différant par Package, Isolation Rating, Isolation Technology, Operating Temperature, Automotive Qualification.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
UCC21540A
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
UCC21540QDWKRQ1
✅ Remplacement direct✓ En stock
$2.21 / unité
Voir la fiche technique →UCC21521DWR
✅ Remplacement direct✓ En stock
$2.15 / unité
Voir la fiche technique →UCC21520
✅ Remplacement direct✓ En stock
$1.55 / unité
Voir la fiche technique →UCC21530Q-Q1
⚡ Même boîtier✓ En stock
$2.1 / unité
Voir la fiche technique →NCD57000
⚡ Même boîtier ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
UCC21540 Valeurs maximales et caractéristiques électriques
| 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 |
| Boîtier | SOIC-16 (DW); DWK with 3.3-mm channel spacing |
| Channel-to-Channel Spacing (DWK) | 3.3 mm |
| Isolation Type | Reinforced / galvanic |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
Configuration des broches de UCC21540
| Broche 1 | VCCI — Input-side supply voltage |
| Broche 2 | GND — Input-side ground |
| Broche 3 | INA — Input A (non-inverting channel A) |
| Broche 4 | INB — Input B (inverting channel B) |
| Broche 5 | DIS — Disable input - forces both outputs low |
| Broche 6 | DT — Deadtime programming resistor pin |
| Broche 7 | NC — No connect |
| Broche 8 | NC — No connect |
| Broche 9 | NC — No connect |
| Broche 10 | VDDA — Output-side supply channel A |
| Broche 11 | OUTA — Gate drive output A |
| Broche 12 | VEEA/COM — Output-side ground / negative rail channel A |
| Broche 13 | VEEB/COM — Output-side ground / negative rail channel B |
| Broche 14 | OUTB — Gate drive output B |
| Broche 15 | VDDB — Output-side supply channel B |
| Broche 16 | NC — No connect |
Applications typiques
UCC21540 convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour UCC21540 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- 8-V UVLO optimized for 10-12V MOSFET/IGBT drive with cost advantage (vs UCC21520)
- 5-V UVLO GaN-friendly upgrade available in same footprint (vs UCC21540A)
- Dual channels with programmable deadtime in one isolated package (vs NCD57000)
- Automotive path with same family (vs UCC21540A)
Notes de conception
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.
Informations de conformité
RoHS compliant per TI product listing. The UCC21540-Q1 variant provides automotive-grade operation with wide temperature range per TI product page.
