Product details

Vin (Max) (V) 34 Vin (Min) (V) 9 Iout (Max) (A) 1 Features Adjustable switching frequency, Current limiting, Enable, Resonant, Soft start, Thermal shutdown Regulated outputs (#) 1 Package type Leaded TI functional safety category Functional Safety-Capable Rating Automotive
Vin (Max) (V) 34 Vin (Min) (V) 9 Iout (Max) (A) 1 Features Adjustable switching frequency, Current limiting, Enable, Resonant, Soft start, Thermal shutdown Regulated outputs (#) 1 Package type Leaded TI functional safety category Functional Safety-Capable Rating Automotive
HVSSOP (DGN) 8 9 mm² 3 x 3
  • 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, TA
  • Functional Safety-Capable
  • 8-Pin DGN package with thermal pad
  • 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, TA
  • Functional Safety-Capable
  • 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.

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.

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Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Support software

UCC25800-Q1 design Calculator

SLUC705.ZIP (604 KB)
Simulation model

UCC25800-Q1 PSpice Transient Model with Sync

SLUM810.ZIP (96 KB) - PSpice Model
Simulation model

UCC25800-Q1 PSpice Transient Model without Sync

SLUM807.ZIP (89 KB) - PSpice Model
Simulation model

UCC25800-Q1 SIMPLIS Transient Model

SLUM781.ZIP (152 KB) - SIMPLIS Model
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 (...)
User guide: PDF
Schematic: 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

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 (...)
Test report: PDF
Schematic: 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
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