Datasheet
Table Of Contents
- NATURAL INTERLEAVING FEATURES
- SYSTEM FEATURES
- APPLICATIONS
- CONTENTS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- DISSIPATION RATINGS
- RECOMMENDED OPERATING CONDITIONS
- ELECTROSTATIC DISCHARGE (ESD) PROTECTION
- ELECTRICAL CHARACTERISTICS
- DEVICE INFORMATION
- TYPICAL CHARACTERISTICS
- APPLICATION INFORMATION
- Theory of Operation
- On-Time Control, Maximum Frequency Limiting, and Restart Timer
- Natural Interleaving
- Phase Management
- Zero Crossing Detection and Valley Switching
- Brownout Protection
- Failsafe OVP—Output Over-Voltage Protection
- Over-Current Protection
- Phase Fail Protection
- Distortion Reduction
- Improved Error Amplifier
- Open-Loop Protection
- Soft-Start
- Light-Load Operation
- Command for the Downstream Converter
- VCC Undervoltage Protection
- VCC
- DESIGN EXAMPLE
- ADDITIONAL REFERENCES
CONTENTS
DESCRIPTION
UCC28061
SLUS837A – JUNE 2008 – REVISED JULY 2009 ..............................................................................................................................................................
www.ti.com
• Ordering Information 2
• Electrical Characteristics 4
• Device Information 7
• Functional Block Diagram 9
• Typical Characteristics 10
• Application Information 16
• Design Example 22
• Additional References 29
Optimized for consumer applications concerned with audible noise elimination, this solution extends the
advantages of transition mode — high efficiency with low-cost components — to higher power ratings than
previously possible. By utilizing a Natural Interleaving technique, both channels operate as masters (that is, there
is no slave channel) synchronized to the same frequency. This approach delivers inherently strong matching,
faster responses, and ensures that each channel operates in transition mode.
Complete system-level protections feature input brownout, output over-voltage, open-loop, overload, soft-start,
phase-fail detection, and thermal shutdown. The additional FailSafe over-voltage protection (OVP) feature
protects against shorts to an intermediate voltage that, if undetected, could lead to catastrophic device failure.
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ORDERING INFORMATION
(1)
PART NUMBER PACKAGE
(2)
OPERATING TEMPERATURE RANGE, T
A
UCC28061D SOIC 16-Pin (D) – 40 ° C to +125 ° C
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com .
(2) SOIC (D) package is available taped and reeled by adding R to the above part number. Reeled quantities for UCC28061DR are 2500
devices per reel.
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