UCC29950 Datasheet, PDF (1/68 Pages) Texas Instruments – UCC29950 CCM PFC and LLC Combo Controller

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UCC29950
SLUSC18A – SEPTEMBER 2014 – REVISED MARCH 2015
UCC29950 CCM PFC and LLC Combo Controller
1 Features
•1 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
Simplified Schematic
VAC
VBLK
CBLK
2 Applications
• Offline AC-to-DC Server Power Supplies (80
PLUS^® Bronze/Silver/Gold)
• Industrial DIN Rail and Open Frame Power
Supplies
• Gaming and Printer Power
• High-Density Adapters
• Lighting Drivers
3 Description
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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCC29950
SOIC 16 Pin (D)
9.90 mm x 6.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
LLC stage Over-Current Protection Profile
13 16 8 11
10 AC1
9 AC2
4 SUFG
5 SUFS
UCC29950
GD2 2
GD1 14
FB 12
VCC 3
1 6 15 7
VCC
Vout
1
900
600
400
300
0
0
10
52
Time (ms)
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.