Product details

Vin (Max) (V) 34 Vin (Min) (V) 9 Iout (Max) (A) 1 Features Adjustable Switching Frequency, Current Limiting, Enable/Shutdown, Resonant, Soft Start, Thermal shutdown Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Package type Leaded TI functional safety category Functional Safety-Capable
Vin (Max) (V) 34 Vin (Min) (V) 9 Iout (Max) (A) 1 Features Adjustable Switching Frequency, Current Limiting, Enable/Shutdown, Resonant, Soft Start, Thermal shutdown Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Package type Leaded TI functional safety category Functional Safety-Capable
HVSSOP (DGN) 8 9 mm² 3 x 3 HVSSOP (DGN) 8
  • 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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Technical documentation

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Type Title Date
* Data sheet UCC25800-Q1 Ultra-low EMI Transformer Driver for Isolated Bias Supplies datasheet (Rev. B) 22 Sep 2021
Application note Bias Supply Design for Isolated Gate Driver Using UCC25800-Q1 (Rev. A) 01 Dec 2021
User guide Using the UCC25800EVM-037 2-W LLC Half-Bridge Converter with Pre-Regulator (Rev. A) 12 Oct 2021
Functional safety information UCC25800-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA 01 Sep 2021
White paper High-Voltage Semiconductor Solutions for Meeting Isolation Requirements 20 Jan 2021
Certificate UCC25800EVM-037 EU RoHS Declaration of Conformity (DoC) 16 Dec 2020

Design & development

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

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 (...)

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Support software

UCC25800-Q1 design Calculator

SLUC705.ZIP (604 KB)
Simulation model

UCC25800-Q1 SIMPLIS Transient Model

SLUM781.ZIP (152 KB) - SIMPLIS Model
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 (...)
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HVSSOP (DGN) 8 View options

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