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UCC25800-Q1
- High-efficiency half-bridge transformer driver
- Ultra-low EMI with low interwinding capacitance
- Smaller and lower-cost transformer
- Programmable frequency: 0.1 MHz to 1.2 MHz
- Wide input voltage range: 9 V to 34 V
- 9 W from 34-V input
- 6 W from 24-V input
- 4 W from 15-V input
- Automatic dead-time adjustment with maximum dead-time programming
- External clock synchronization for low noise
- Robust protection features
- Undervoltage lockout (UVLO)
- Programmable over-current protection (OCP)
- Input overvoltage protection (OVP)
- Over temperature protection (TSD)
- Integrated soft-start to reduce in-rush current
- External disable function with fault-code output
- AEC-Q100 qualified for automotive applications:
- Temperature grade 1: –40°C to +125°C, T A
- Functional Safety-Capable
- Documentation available to aid functional safety system design
- 8-Pin DGN package with thermal pad
The UCC25800-Q1 ultra-low EMI transformer driver integrates the switching power stage, the control, and the protection circuits to simplify isolated bias supply designs. It allows the design to utilize a transformer with higher leakage inductance, but much smaller parasitic primary-to-secondary capacitance. This low-capacitance transformer design enables an order of magnitude reduction in the common-mode current injection through the bias transformer. This makes the transformer driver an ideal solution for the isolated bias supply in various automotive applications to minimize the EMI noise caused by the high-speed switching devices. The soft-switching feature further reduces the EMI noise.
The transformer driver has a programmable frequency range of 100 kHz to 1.2 MHz. This high switching frequency reduces the transformer size and footprint, as well as the overall cost of the bias supply. The integrated SYNC function allows the system bias supplies to synchronize with an external clock signal, further reducing the system level noise.
The dead-time adjusts automatically to minimize the conduction loss and simplify the design. The programmable maximum dead-time ensures power stage design flexibility.
With the integrated, low-resistance switching power stage, the transformer driver can achieve a 6-W design with 24-V input, and up to 9-W from 34-V input. With a fixed input voltage, the open-loop control also helps the output regulation to remain ±5% when the load is above 10%.
The programmable overcurrent protection (OCP) allows flexibility on the power stage design to minimize the transformer size. The protection features such as adjustable OCP, input OVP, TSD and the protection from pin faults ensure robust operation. A fixed 1.5-ms soft-start period reduces the inrush current during start-up and fault recovery.
The transformer driver also provides a dedicated multi-function pin for external disabling, and fault code reporting. The fault code reporting sends the fault code once the bias supply is in the protection mode.
The UCC25800-Q1 transformer driver is offered in an 8-pin DGN package with the thermal pad to enhance its thermal handling capability.
Technical documentation
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Evaluation board
UCC21710QDWEVM-054 — UCC21710 evaluation module for Wolfspeed® 1200-V SiC platforms
The UCC21710QDWEVM-054 is a compact half-bridge gate driver evaluation module consisting of two single-channel isolated gate drivers. This evaluation module provides supply voltage, drive, protection and monitoring needed for driving several different models (...)
User guide: PDF
Evaluation board
UCC21750QDWEVM-054 — UCC21750 evaluation module for Wolfspeed® 1200-V SiC platforms
The UCC21750QDWEVM-054 is a compact half-bridge gate driver evaluation module consisting of two single-channel isolated gate drivers. The evaluation module provides supply voltage, drive, protection and monitoring needed for driving several different models of Wolfspeed® (...)
User guide: PDF
Evaluation board
UCC25800EVM-1 — UCC25800 evaluation module for 2-W LLC converter with 6-V to 26-V DC input and 18-V and 5-V outputs
This isolated open-loop LLC transformer driver converter is based on the device UCC25800 and has a pair of outputs, +18-V and -5-V, and provides output power up to 2 W from 6-V to 26-V DC input to provide isolated bias power to SiC MOSFET or IGBT gate drivers for traction inverter and industrial (...)
Reference designs
PMP22835 — Isolated IGBT and SiC driver bias supply reference design for traction-inverter applications
This isolated open-loop LLC transformer driver converter provides dual +20-V and -4-V outputs up to 6 W for traction inverter applications. The LLC topology allows the transformer to have significant leakage inductance, but a much smaller primary-secondary capacitance, which significantly reduces (...)
Reference designs
PMP23061 — Pre-regulated isolated driver bias supply reference design for traction-inverter applications
This pre-regulated isolated open-loop LLC transformer driver converter reference design provides four 18-V outputs up to a total of 6 W for traction-inverter applications. The LLC topology allows the transformer to have significant leakage inductance, but a much smaller primary-secondary (...)
Reference designs
PMP31182 — Isolated bias power supply reference designs using four different topologies
This reference design showcases four isolated bias power supply designs using different topologies as PSR flyback, push-pull, LLC resonant and isolated DCDC module. These topologies provide specific benefits but at the same time come with trade-offs. An ample comparison of these topologies is done (...)
Test report: PDF
Reference designs
PMP23209 — Highly-integrated, 12-V, 100-mA, dual-output, isolated bias supply reference design
This reference design generates two isolated +12-V rails at 100 mA each from a 12-VDC input voltage. The design is optimized for a small footprint by using a primary resonant LLC topology with a single driver and transformer with functional insulation.
Test report: PDF
Reference designs
PMP23216 — Highly-integrated, dual-output isolated bias supply reference design with reinforced insulation
This reference design generates two isolated +12-V rails at 100 mA each from a 12-VDC input voltage. The design is for a small footprint by using a primary resonant LLC topology with a single driver and transformer with reinforced insulation. This design can be used for an application where bias (...)
Test report: PDF
Reference designs
PMP31054 — LLC converter with air-core transformer reference design, anti-tampering for e-meter applications
This reference design features an LLC converter controlled by UCC25800-Q1 (open-loop LLC transformer driver for isolated bias supplies), operating with 9 V and generating three output voltages of 9.0 V with a maximum load current of 50 mA each. An air core transformer was used to avoid the core (...)
Test report: PDF
Reference designs
PMP23240 — 3-W LLC bias supply with dual 18-V output reference design
This reference design uses a single UCC25800-Q1 to drive two LLC transformers with 600-kHz switching frequency. The transformer used in this design is 750319177 which is an off-the-shelf catalog transformer featuring low-interwinding capacitance of 0.68-pF typical which is beneficial for (...)
Test report: PDF
Reference designs
PMP23124 — 12-VIN dual-output-bias supplies reference design
This reference design uses a single UCC25800-Q1 to drive two LLC transformers. Each isolated output feeds into a TPS7A39 dual-channel positive- and negative-output LDO. PMP23124 can be used to bias two wideband-gap FETs that require a positive and negative voltage to drive. Each output can be (...)
Test report: PDF
Reference designs
PMP40970 — Multiple-output isolated driver bias-supply reference design
This isolated open-loop LLC transformer-driver converter reference design provides four rail outputs. Each output has dual +18-V and –5-V outputs up to 0.5 W for traction inverter applications. The LLC topology allows the transformer to have significant leakage inductance, but a much smaller (...)
Test report: PDF
Reference designs
PMP40980 — Multiple-output isolated SiC driver bias-supply reference design for onboard charger applications
This reference design is an open-loop LLC converter, which provides four 18-V and 2.5 V outputs and up to 2.4 W for onboard charger applications. UCC25800-Q1 is used as the controller. LLC topology allows the transformer to have significant leakage inductance, but a much smaller primary-secondary (...)
Test report: PDF
| Package | Pins | Download |
|---|---|---|
| HVSSOP (DGN) | 8 | View options |
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