UCC21550ADWR - 4A/6A Isolated Dual Gate Driver | Texas Instruments

Solar Inverters

Solar string and central inverters use half-bridge and full-bridge power stages switching at 20-100 kHz with IGBTs or SiC MOSFETs. The UCC21550ADWR fits this application because its 5000Vrms reinforced isolation bridges the control ground to the floating power-stage ground, and its CMTI greater than 125 V/ns keeps outputs correct even when the switch node swings hundreds of volts in nanoseconds. The programmable dead time protects the bridge from shoot-through, while the 6A peak sink current rapidly discharges gate capacitance to cut switching losses and improve efficiency ratings. In MPPT stages using SiC devices, the 25V VDD range supports the higher gate-drive voltages SiC requires. Placing a low-ESR 10uF ceramic capacitor close to each VDD pin ensures the 4A source pulses are delivered without droop.

SiC Half-Bridge Power Stages

SiC MOSFET half-bridges switch faster than silicon IGBTs, producing dV/dt edges that can exceed 50-100 V/ns - levels that corrupt optocoupler drivers. The UCC21550ADWR's capacitive isolation with CMTI greater than 125 V/ns maintains signal integrity across the barrier under these conditions. Its asymmetric 4A source / 6A sink drive turns the SiC MOSFET off faster than it turns on, suppressing Miller-induced parasitic turn-on of the complementary switch. The 25V VDD capability accommodates the 15-18V gate drive SiC devices need for low on-resistance. Engineers should confirm the 5V UVLO threshold matches their bias rail and add a dedicated Miller clamp or negative bias stage at the gate if the application demands it. The -40C to +150C junction range covers harsh thermal environments.

Industrial Motor Drives

Three-phase industrial motor drives use six isolated gate drivers to switch IGBT or MOSFET bridges at 5-20 kHz. The UCC21550ADWR's universal configuration - two low-side, two high-side, or half-bridge - lets one part number cover multiple inverter positions, simplifying BOM management. Reinforced 5000Vrms isolation meets the safety separation required between user-accessible control electronics and the hazardous DC bus, which commonly reaches 400-800V. Programmable dead time prevents shoot-through even with slow-tailing IGBTs, and the DISABLE pin allows immediate shutdown during fault conditions detected by the drive controller. The -40C to +150C junction temperature range tolerates the elevated ambient temperatures inside sealed drive enclosures, supporting long design lifetimes in factory automation equipment.

Onboard Chargers and EV Power Conversion

EV onboard chargers, DC-DC converters, and auxiliary power modules operate at high frequency with SiC or GaN power stages, requiring isolation and fast switching in a compact footprint. The UCC21550ADWR provides the 5000Vrms reinforced isolation demanded by automotive safety standards and the CMTI greater than 125 V/ns needed for fast-switching topologies such as totem-pole PFC and CLLLC resonant converters. The 4A/6A asymmetric drive minimizes switching losses, directly improving converter efficiency and reducing thermal load in space-constrained modules. For production automotive programs, pair this driver's behavior with the AEC-Q100-qualified family variants (UCC21550AQDWKRQ1 or UCC21550BQDWRQ1). Verify creepage and clearance in the SOIC-16 layout against your isolation working-voltage requirement.

Server and Telecom Power Supplies

High-density server PSUs and telecom rectifiers use LLC, phase-shifted full-bridge, and totem-pole PFC topologies switching at 100 kHz to 1 MHz with GaN FETs. The UCC21550ADWR supports these designs with 6A peak sink current that rapidly discharges the gate of fast-switching devices, reducing dead-time requirements and body-diode conduction losses. Capacitive isolation with CMTI above 125 V/ns stays robust across the high dV/dt switch node, unlike slower optocoupler solutions. The DISABLE pin enables fast fault shutdown coordinated with the digital power controller, and the 5V UVLO protects the power stage during bias-rail startup sequencing. The 16-SOIC DW package fits the tight layouts of hot-swappable power modules while maintaining adequate isolation spacing for 48V-bus-derived stages.

GaN Fast Switching Converters

GaN-based converters switch at very high frequencies (300 kHz to 2 MHz) with sub-10 ns transition edges, demanding a driver with ultra-fast propagation and extreme CMTI. The UCC21550ADWR's CMTI greater than 125 V/ns and capacitive isolation architecture keep the isolated channels immune to the large common-mode swings inherent in GaN half-bridges. Its 6A sink current pulls the low-threshold GaN gate below the 0V turn-off requirement quickly, while the 4A source supports fast enhancement for low switching loss. Programmable dead time, set via an external resistor, can be tuned to the very short intervals GaN bridges need. Layout discipline is critical: keep the driver output loop inductance below a few nH by placing the device directly adjacent to the GaN FET with tight gate-return routing.