UCC28950-Q1
www.ti.com
SLUSAG4A –APRIL 2011–REVISED JULY 2012
Phase-Shifted Full-Bridge Controller With Synchronous Rectification
Check for Samples: UCC28950-Q1
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FEATURES
With Hiccup Mode Support
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150-µA Start-Up Current
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Qualified for Automotive Applications
VDD Undervoltage Lockout
AEC-Q100 Qualified With the Following
Results:
Wide Temperature Range, –40°C to 125°C
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Device Temperature Grade 1: –40ºC to
125ºC Ambient Operating Temperature
Range
APPLICATIONS
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Phase-Shifted Full-Bridge Converters
Industrial Power Systems
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Device HBM ESD Classification Level H2
Device CDM ESD Classification Level C3B
High-Density Power Architectures
Solar Inverters and Electric Vehicles
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Enhanced Wide-Range Resonant Zero-Voltage
Switching (ZVS) Capability
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Direct Synchronous Rectifier (SR) Control
Light-Load Efficiency Management Including
DESCRIPTION
The
UCC28950-Q1
enhanced
phase-shifted
controller builds upon Texas Instruments' industry-
standard UCCx895 phase-shifted controller family
with enhancements that offer best-in-class efficiency
in today’s high-performance power systems. The
UCC28950-Q1 implements advanced control of the
full bridge along with active control of the
synchronous-rectifier output stage.
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Burst Mode Operation
Discontinuous Conduction Mode (DCM),
Dynamic SR On/Off Control With
Programmable Threshold
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Programmable Adaptive Delay
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Average- or Peak-Current Mode Control With
Programmable Slope Compensation and
Voltage-Mode Control
The primary-side signals allow programmable delays
to ensure ZVS operation over wide load-current and
input-voltage ranges, while the load current naturally
tunes the secondary-side switching delays of the
synchronous rectifiers, maximizing overall system
efficiency.
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Closed-Loop Soft-Start and Enable Function
Programmable Switching Frequency up to 1
MHz with Bidirectional Synchronization
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(±3%) Cycle-by-Cycle Current Limit Protection
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PRODUCTION DATA information is current as of publication date.
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necessarily include testing of all parameters.
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