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UCC2540-UCC2540PWP
High Efficiency Secondary Side Synchronous Buck PWM Controller
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SLUS539C − JUNE 2004 − REVISED OCTOBER 2008
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FEATURES On-Chip Predictive Gate Drive� for
High-Efficiency Synchronous Buck
Operation Dual ±3-A TrueDrive� Outputs 1-MHz High Frequency Operation with 70-ns
Delay from SYNCIN to G1 Output Leading Edge Modulation Overcurrent Protection using a Parallel
Average Current Mode Control Loop 3 Modes to Support 2.7-V to 35-V Bias
Operation Reverse Current Protection for Output Stage User Programmable Shutdown ±1.0% Initial Tolerance Bandgap Reference
High Bandwidth Error Amplifiers Thermally Enhanced HTSSOP 20-Pin
PowerPAD� Package
SIMPLIFIED APPLICATION DIAGRAM
APPLICATIONS Secondary-Side Post Regulation (SSPR) for
Multiple Output Power Supplies Cascaded Buck Converters Post Processing Converters for Bus
Converter and DC Transformer Architectures
DESCRIPTIONThe UCC2540 is a secondary-side synchronous
buck PWM controller for high current and low
output voltage applications. It can be used either
as the local secondary-side controller for isolated
dc-to-dc converters using two-stage cascaded
topologies or as a secondary-side post regulator
(SSPR) for multiple output power supplies.
The UCC2540 runs with the synchronization
signal from either the primary side or the high duty
cycle quasi-dc output of bus converters or dc
transformers. For higher efficiency, it also
incorporates the Predictive Gate Drive�
technology that virtually eliminates body diode
conduction losses in synchronous rectifiers.
UDG−04057
Input
