UCC2897A

高级电流模式有源钳位 PWM 控制器

The PWM controller simplifies implementation of the various active clamp or reset and synchronous rectifier switching power topologies.

The UCC2897A is a peak current-mode fixed-frequency high-performance pulse-width modulator. The controller includes the logic and the drive capability for the P-channel auxiliary switch along with a simple method of programming the critical delays for proper active-clamp operation.

Features include an internal programmable slope compensation circuit, precise DMAX limit, and a synchronizable oscillator with an internal-timing capacitor. An accurate line-monitoring function also programs the ON and OFF transitions of the converter with regard to the bulk input voltage, VIN.

The UCC2897A adds a second-level hiccup-mode current-sense threshold, bi-directional synchronization and input-overvoltage protection functionalities. The UCC2897A is offered in 20-pin TSSOP PW and 20-pin QFN RGP packages.

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Low-Output Jitter

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Soft-Stop Shutdown of MAIN and AUX

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110-V Input Startup Function

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Ideal for Active-Clamp, Reset-Forward, Flyback and Synchronous Rectifier Uses

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Provides Complementary Auxiliary Driver with Programmable Dead Time Turn-On Delay between AUX and MAIN Switches

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Peak Current-Mode Control with 0.5-V Cycle-by-Cycle Current Limiting

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TrueDrive 2-A Sink, 2-A Source Outputs

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Trimmed Internal-Bandgap Reference for Accurate Line UV and Line OV Threshold

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Programmable Slope Compensation

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High-Performance 1-MHz Synchronizable Oscillator with Internal Timing Capacitor

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Precise Programmable Maximum Duty Cycle

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PB-Free Lead Finish Package