UCC25800AQDGNRQ1

The UCC25800-Q1 ultra-low EMI transformer driver integrates a switching power stage, control, and protection circuits, which can simplify the design of isolated bias power supplies. It allows the design to use transformers with higher leakage inductance but much smaller primary-to-secondary parasitic capacitance. This low-capacitance transformer design can reduce the common-mode current injection through the bias transformer by an order of magnitude. This makes the transformer driver an ideal solution for isolated bias power supplies in various automotive applications to minimize the EMI noise caused by high-speed switching devices. The soft-switching feature can further reduce EMI noise. This transformer driver has a programmable frequency range from 100kHz to 1.2MHz. This high switching frequency can reduce the size and footprint of the transformer and lower the total cost of the bias power supply. The integrated SYNC function allows the system bias power supply to synchronize with an external clock signal, thereby further reducing system-level noise. The dead time is automatically adjusted to minimize conduction losses as much as possible and simplify the design. The programmable maximum dead time ensures the flexibility of the power stage design. With the integrated low-resistance switching power stage, the transformer driver can achieve a 6W design at a 24V input and up to a 9W design at a 34V input. With a fixed input voltage, open-loop control also helps maintain the output regulation within ±5% when the load is higher than 10%. The programmable overcurrent protection (OCP) allows flexible design of the power stage to minimize the transformer size as much as possible. Protection functions such as adjustable OCP, input OVP, TSD, and pin fault protection ensure robust operation. The fixed 1.5ms soft-start period can reduce the inrush current during startup and fault recovery. This transformer driver also provides a dedicated multi-function pin for external disable and fault code reporting. Once the bias power supply is in the protection mode, the fault code reporting will send a fault code. The UCC25800-Q1 transformer driver is available in an 8-pin DGN package with a thermal pad to enhance its heat treatment capability.

Applications

• Automotive traction inverters and motor control
• On-board chargers (OBC)
• Automotive DC/DC converters
• EV charging stations, DC fast charging stations
• UPS and PV inverters
• Industrial motors, elevators, and escalators
• GaN, IGBT, and SiC gate transformer driver bias supplies

Key features

• High-efficiency half-bridge transformer driver with ultra-low EMI due to low interwinding capacitance
• Smaller, lower-cost transformer
• Programmable frequency: 0.1MHz to 1.2MHz
• Wide input voltage range: 9V to 34V
• 9W at 34V input
• 6W at 24V input
• 4W at 15V input
• Automatic dead-time adjustment with maximum dead-time programming
• External clock synchronization for low noise
• Robust protection features
• Undervoltage lockout (UVLO)
• Programmable overcurrent protection (OCP)
• Input overvoltage protection (OVP)
• Thermal shutdown (TSD)
• Integrated soft-start to reduce inrush current
• External disable with fault code output
• AEC-Q100 qualified for automotive applications
• Temperature Grade 1: -40°C to +125°C, TA
• Functional Safety capable
• Documentation available to aid functional safety system design
• 8-pin DGN package with thermal pad