NEW

UCC25800-Q1

PREVIEW

Open-loop LLC transformer driver for isolated bias supplies

Top

Product details

Parameters

Topology Resonant LLC Duty cycle (Max) (%) 50 UVLO thresholds on/off (V) 8.5/8 Features Adjustable Switching Frequency, Current Limiting, Enable/Shutdown, Resonant, Soft Start, Thermal Shutdown Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

HVSSOP (DGN) 8 open-in-new Find other PWM controllers & resonant controllers

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
open-in-new Find other PWM controllers & resonant controllers

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.

open-in-new Find other PWM controllers & resonant controllers
Download

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 4
Type Title Date
* Data sheet UCC25800-Q1 Open-Loop LLC Transformer Driver for Isolated Bias Supplies datasheet (Rev. A) Jul. 20, 2021
Application note Bias Supply Design for Isolated Gate Driver Using UCC25800-Q1 Mar. 31, 2021
User guide Using the UCC25800EVM-037 2-W LLC Half-Bridge Converter with Pre-Regulator Mar. 12, 2021
Certificate UCC25800EVM-037 EU RoHS Declaration of Conformity (DoC) Dec. 16, 2020

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
175
Description

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 (...)

Features
  • UCC25800 2-W LLC converter with 6-V to 26-V dc input and 18-V and 5-V outputs
  • Provide isolated bias power to SiC MOSFET or IGBT gate drivers for traction inverter and industry inverter applications
  • Allow transformer with significant leakage inductance but much less primary-to-secondary capacitance to (...)

Software development

SUPPORT SOFTWARE Download
SLUC705.ZIP (604 KB)

Design tools & simulation

SIMULATION MODEL Download
SLUM781.ZIP (152 KB) - SIMPLIS Model

Reference designs

REFERENCE DESIGNS Download
Isolated IGBT and SiC driver bias supply reference design for traction-inverter applications
PMP22835 — 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
HVSSOP (DGN) 8 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos