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UCC2540 Datasheet High-Efficiency Secondary Side Synchronous PWM Controller

Manufacturer: Texas Instruments

Overview: UCC2540 ą SLUS539C − JUNE 2004 − REVISED OCTOBER 2008 HIGHĆEFFICIENCY SECONDARYĆSIDE SYNCHRONOUS BUCK PWM.

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General Description

The 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.

Key Features

  • D On-Chip Predictive Gate Drivet for High-Efficiency Synchronous Buck Operation D Dual ±3-A TrueDrivet Outputs D 1-MHz High Frequency Operation with 70-ns Delay from SYNCIN to G1 Output D Leading Edge Modulation D Overcurrent Protection using a Parallel Average Current Mode Control Loop D 3 Modes to Support 2.7-V to 35-V Bias Operation D Reverse Current Protection for Output Stage D User Programmable Shutdown D ±1.0% Initial Tolerance Bandgap Reference D High Bandwidth Error Amplifiers D Thermal.

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