Product details

Topology Boost, LLC Control mode CCM Practical operating frequency (Max) (MHz) 0.1 UVLO thresholds on/off (V) 16.2/7.9 Device type Controllers Operating supply current (mA) 8 Features OVP, Peak Current Mode, Transition Control Mode Rating Catalog Operating temperature range (C) -40 to 125
Topology Boost, LLC Control mode CCM Practical operating frequency (Max) (MHz) 0.1 UVLO thresholds on/off (V) 16.2/7.9 Device type Controllers Operating supply current (mA) 8 Features OVP, Peak Current Mode, Transition Control Mode Rating Catalog Operating temperature range (C) -40 to 125
SOIC (D) 16 59 mm² 9.9 x 6
  • High Efficiency PFC and Half-Bridge Resonant LLC Combo Controller
  • Continuous Conduction Mode (CCM) Boost Power Factor Correction
  • Supports Self-Bias or Auxiliary (external) Bias Mode of Operation
  • PFC Loops Fully Internally Compensated
  • PFC Stage Design in 3 Easy Steps
    (design voltage feedback, current feedback and power stage)
  • Fixed 100-kHz PFC Frequency with Dithering for Ease of EMI Compliance
  • True Input Power Limit, Independent of Line Voltage
  • Fixed LLC Frequency Operating Range of 70 kHz to 350 kHz
  • Dead-Time Varied Across Load Range for LLC Half-Bridge Power Stage to Extend ZVS Range
  • Three-Level LLC Over-Current Protection
  • Hiccup Mode Operation for Continuous Overload and Short-Circuit Power Protection
  • Low Standby Power Consumption Enabled by Active Control of High-Voltage Start-Up MOSFET and X-Cap Discharge Function
  • Built In Soft-Start and Converter Sequencing to Simplify Design
  • AC Line Brownout Protection, with Fail Indicator
  • PFC Bus Over-Voltage and Under-Voltage Protection
  • Over-Temperature Protection
  • External Gate Drivers for Scalability with Power Level
  • SOIC-16 Package
  • High Efficiency PFC and Half-Bridge Resonant LLC Combo Controller
  • Continuous Conduction Mode (CCM) Boost Power Factor Correction
  • Supports Self-Bias or Auxiliary (external) Bias Mode of Operation
  • PFC Loops Fully Internally Compensated
  • PFC Stage Design in 3 Easy Steps
    (design voltage feedback, current feedback and power stage)
  • Fixed 100-kHz PFC Frequency with Dithering for Ease of EMI Compliance
  • True Input Power Limit, Independent of Line Voltage
  • Fixed LLC Frequency Operating Range of 70 kHz to 350 kHz
  • Dead-Time Varied Across Load Range for LLC Half-Bridge Power Stage to Extend ZVS Range
  • Three-Level LLC Over-Current Protection
  • Hiccup Mode Operation for Continuous Overload and Short-Circuit Power Protection
  • Low Standby Power Consumption Enabled by Active Control of High-Voltage Start-Up MOSFET and X-Cap Discharge Function
  • Built In Soft-Start and Converter Sequencing to Simplify Design
  • AC Line Brownout Protection, with Fail Indicator
  • PFC Bus Over-Voltage and Under-Voltage Protection
  • Over-Temperature Protection
  • External Gate Drivers for Scalability with Power Level
  • SOIC-16 Package

The UCC29950 provides all the control functionality for an AC-to-DC converter with a CCM boost Power Factor Correction (PFC) stage followed by an LLC converter stage. The controller is optimized to allow ease of use.

Proprietary CCM PFC algorithms enable the system to achieve high efficiency, smaller converter size with high power factor. The integrated LLC controller enables a high-efficiency DC-to-DC conversion stage utilizing soft switching for low EMI noise. Integration of PFC control and LLC control in a combo controller allows the control algorithms to take advantage of information from both stages.

The controller includes a control circuit for start-up using a Depletion Mode MOSFET with internal device power management that minimizes external component requirements and helps lower system implementation costs.

To further reduce the standby power an X-Cap discharge circuit is integrated. The UCC29950 implements a complete suite of system protection functions, including AC line brownout, PFC bus under voltage PFC and LLC, over current and thermal shutdown.

The UCC29950 provides all the control functionality for an AC-to-DC converter with a CCM boost Power Factor Correction (PFC) stage followed by an LLC converter stage. The controller is optimized to allow ease of use.

Proprietary CCM PFC algorithms enable the system to achieve high efficiency, smaller converter size with high power factor. The integrated LLC controller enables a high-efficiency DC-to-DC conversion stage utilizing soft switching for low EMI noise. Integration of PFC control and LLC control in a combo controller allows the control algorithms to take advantage of information from both stages.

The controller includes a control circuit for start-up using a Depletion Mode MOSFET with internal device power management that minimizes external component requirements and helps lower system implementation costs.

To further reduce the standby power an X-Cap discharge circuit is integrated. The UCC29950 implements a complete suite of system protection functions, including AC line brownout, PFC bus under voltage PFC and LLC, over current and thermal shutdown.

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Technical documentation

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Type Title Date
* Data sheet UCC29950 CCM PFC and LLC Combo Controller datasheet (Rev. A) 20 Mar 2015
Technical article Power Tips: Centralized control makes power supply design easier 18 Dec 2015
User guide Using the UCC29950EVM-631 300-W PFC/LLC Off-Line PSU Module (Rev. A) 11 Mar 2015
Application note LLC Design for UCC29950 16 Feb 2015
More literature Designing an LLC Resonant Half-Bridge Power Converter 26 Jul 2011

Design & development

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Calculation tool

UCC29950 Design Calculator (Rev. A)

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Reference designs

PMP20367 — High Efficiency 300W AC/DC Power Supply Reference Design

PMP20367 is high-efficiency AC/DC power supply reference design with universal AC input and 55V/5.5A and 12V/1A outputs. LLC+PFC combo IC UCC29950 is applied for the main power stages with 55V/5.5A output while UCC28730 is applied for the auxiliary power with 12V/1A output.  This design has (...)
Reference designs

PMP30192 — Universal Input, 360W PFC + LLC with Combo-IC Reference Design

This power supply reference design consists of a synchronous-rectification LLC isolated half-bridge associated to a CCM PFC stage. It needs 14V-primary (100mA max.) and 7V-secondary (50mA max.) as bias supply. Thanks to low-profile construction (20mm height), it can be employed in LCD screen (...)
Reference designs

PMP11237 — Power Supply Reference Design with Single Layer PCB and UCC29950 LLC+PFC Combo Controller

PMP11237 is a complete AC/DC power supply reference design with universal AC input and 12V/25A output. LLC+PFC combo IC UCC29950 is applied as the main controller with high voltage bridge gate driver UCC27714 applied as the driver of the LLC input MOSFETs.  This design evaluates the (...)
Reference designs

PMP11303 — High Efficiency 350W AC/DC Power Supply Reference Design

PMP11303 is high-efficiency AC/DC power supply reference design with universal AC input and 25V/13.5A and 12V/1A outputs. LLC+PFC combo IC UCC29950 is applied for the main power stages with 25V/13.5A output while UCC28730 is applied for the auxiliary power with 12V/1A output. This design has low no (...)
Reference designs

TIDA-00520 — 300-W PFC plus Resonant LLC Half-Bridge controller off-line AC/DC PSU Module

This is a high efficiency 300-W AC/DC reference design.  The design can be biased from external supply or configured for Self-Bias Auxillary mode for operation directly off the AC mains.  The PFC is fully internally compensated, reducing design complexity and pcb design.  Protections (...)
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