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Texas Instruments UCC25800 | Demoboard UCC25800EVM-037
Open-loop LLC transformer driver for isolated bias supplies
Overview
| Topology | LLC Resonant Converter |
| Input voltage | 6-26 V |
| Output 1 | -5 V / -0.09 A |
| Output 2 | 18 V / 0.09 A |
Description
The UCC25800-Q1 open-loop LLC transformer driver integrates the switching power stage, the control, and the protection circuits to simplify isolated bias supply designs. The LLC topology 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 UCC25800-Q1 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 UCC25800-Q1 operates with soft switching to further reduce the EMI noise.UCC25800-Q1 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 bias supplies in the system to be synchronized with an external clock signal, further reducing the system level noise.The dead-time of UCC25800-Q1 is adjusted automatically to minimize the conduction loss and simplify the design. The maximum dead-time is programmable to ensure power stage design flexibility.With the integrated low-resistance switching power stage, the UCC25800-Q1 can achieve a 6-W design with 24-V input. With a fixed input voltage that is above 9 V and below 34 V, the open-loop LLC converter control also helps the output regulation to remain ±5% when the load is above 10%.The programmable over-current protection (OCP) allows flexibility on the power stage design to minimize the transformer size, further reducing the system cost. 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 reduces the inrush current during start-up and fault recovery.UCC25800-Q1 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, allowing the system level controller to make more intelligent decisions during system failure modes.The UCC25800-Q1 is offered in an 8-pin DGN package with the thermal pad to enhance its thermal handling capability.
Features
- Open-loop LLC transformer driver
- Ultra-low EMI
- Supply range: 9 V to 34 V
- Output power: 6-W with 24-V input
- Resistor programmable switching frequency from 100 kHz to 1.2 MHz
- Synchronization to external clock
- Programmable maximum dead-time with automatic dead-time adjustment
- Undervoltage lockout
- Adjustable over-current protection threshold
- External disable function
- Input over voltage protection
- Over temperature protection (TSD)
- Fault-code output for system intelligence
- Latched and fault-auto-restart versions available
- 8-Pin DGN package with thermal pad
Typical applications
- Driver isolated bias power supplies for SiC MOSFET traction inverters, Driver isolated bias power supplies for IGBT traction inverters, Industrial inverter driver isolated bias power supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN(V) | VOut1(V) | PO(W) | CWW 1(pF) | L(µH) | ISAT(A) | ∫Udt(µVs) | fswitch(kHz) | n | Version | IC Reference | Winding Style | Number of windings | L1(µH) | Z(Ω) | IR(mA) | RDC max.(Ω) | VR(V) | L1(µH) | L2(µH) | IR(A) | IR 2(A) | ISAT(A) | RDC1 typ(Ω) | RDC2 typ(Ω) | RDC1 max(Ω) | RDC2 max(Ω) | fres(MHz) | Type | Pins | PCB/Cable/Panel | Modularity | Wire Section | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-AGDT Auxiliary Gate Drive Transformer, 7.5, 13 V | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-AGDT Auxiliary Gate Drive Transformer | Input Voltage 7.5 | Output Voltage 113 V | Total Output Power4.55 W | Interwinding Capacitance0.68 pF | Inductance16.5 µH | – | Voltage-µSecond36 µVs | Switching Frequency 500 | Turns Ratio1:1.67 | VersionLLC | IC ReferenceUCC25800 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||
| WE-AGDT Auxiliary Gate Drive Transformer, 13, 11.5 V | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-AGDT Auxiliary Gate Drive Transformer | Input Voltage 13 | Output Voltage 111.5 V | Total Output Power6 W | Interwinding Capacitance1.3 pF | Inductance50 µH | – | Voltage-µSecond60 µVs | Switching Frequency 500 | Turns Ratio1:1 | VersionLLC | IC ReferenceUCC25800 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||
 | WE-SL5 HC SMT Common Mode Line Filter, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-SL5 HC SMT Common Mode Line Filter | – | – | – | – | Inductance11 µH | – | – | – | – | VersionSMT | – | Winding Stylesectional | Number of windings2 | Inductance [1]11 µH | Impedance1000 Ω | Rated Current2500 mA | DC Resistance [1]0.03 Ω | Rated Voltage80 V | – | – | – | – | – | – | – | – | – | – | – | Pins4 | – | – | – | ||||
 | WE-DD SMT Shielded Coupled Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-DD SMT Shielded Coupled Inductor | – | – | – | – | Inductance1.5 µH | Saturation Current17.5 A | – | – | Turns Ratio1:1 | – | – | – | – | – | – | – | – | – | Inductance 11.5 µH | Inductance 21.5 µH | Rated Current8.6 A | Rated Current 28.6 A | Saturation Current17.5 A | DC Resistance 10.012 Ω | DC Resistance 20.012 Ω | DC Resistance 10.016 Ω | DC Resistance 20.016 Ω | Self Resonant Frequency60 MHz | TypeCrossed | – | – | – | – | ||||
 | WR-TBL Series 3137 - 5.00 mm Close Horizontal PCB Header, –, – | Simulation– | Downloads6 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-TBL Series 3137 - 5.00 mm Close Horizontal PCB Header | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | TypeHorizontal | Pins2 | PCB/Cable/PanelPCB | ModularityNo | – | ||
| WR-TBL Series 3137 - 5.00 mm Close Horizontal PCB Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-TBL Series 3137 - 5.00 mm Close Horizontal PCB Header | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | TypeHorizontal | Pins3 | PCB/Cable/PanelPCB | ModularityNo | – | |||
 | WR-TBL Series 3527 - 5.00 mm Vertical, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-TBL Series 3527 - 5.00 mm Vertical | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | TypeVertical | Pins2 | PCB/Cable/PanelCable | ModularityNo | Wire Section 12 to 22 (AWG) 3.31 to 0.129 (mm²) | |||
| WR-TBL Series 3527 - 5.00 mm Vertical, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-TBL Series 3527 - 5.00 mm Vertical | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | TypeVertical | Pins3 | PCB/Cable/PanelCable | ModularityNo | Wire Section 12 to 22 (AWG) 3.31 to 0.129 (mm²) |