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UCC2897

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Current Mode Active Clamp PWM Controller

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UCC2897 is in the process of being discontinued
This product is in the process of being discontinued. New designs should consider an alternate product.
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UCC2897A ACTIVE 110-V active clamp current mode PWM controller with P-channel clamp FET and line OV protection This product is a replacement device for 0 to 70 degrees C. Designs can achieve better performance.

UCC2897

LAST TIME BUY
Data sheet Order now

Product details

Operating temperature range (°C) -40 to 105 Rating Catalog
Operating temperature range (°C) -40 to 105 Rating Catalog
TSSOP (PW) 20 41.6 mm² 6.5 x 6.4
  • Ideal for Active Clamp/Reset Forward, Flyback and Synchronous Rectifier Apps
  • Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches
  • Peak Current-Mode Control with 0.5-V Cycle-by-Cycle Current Limiting
  • Hiccup Mode 0.75-V Current Limit
  • TrueDrive™ 2-A Sink, 2-A Source Outputs
  • 110-V Input Startup Device
  • Trimmed Internal Bandgap Reference for Accurate Line UV and Line OV Threshold
  • Programmable Slope Compensation
  • High-Performance 1.0-MHz Synchronizable Oscillator with Internal Timing Capacitor
  • Precise Programmable Maximum Duty Cycle
  • PB-Free Lead Finish Package
  • APPLICATIONS
    • High-Efficiency DC/DC Power Supplies
    • Server Power, 48-V Telecom, Datacom, and 42-V Automotive Applications
  • Ideal for Active Clamp/Reset Forward, Flyback and Synchronous Rectifier Apps
  • Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches
  • Peak Current-Mode Control with 0.5-V Cycle-by-Cycle Current Limiting
  • Hiccup Mode 0.75-V Current Limit
  • TrueDrive™ 2-A Sink, 2-A Source Outputs
  • 110-V Input Startup Device
  • Trimmed Internal Bandgap Reference for Accurate Line UV and Line OV Threshold
  • Programmable Slope Compensation
  • High-Performance 1.0-MHz Synchronizable Oscillator with Internal Timing Capacitor
  • Precise Programmable Maximum Duty Cycle
  • PB-Free Lead Finish Package
  • APPLICATIONS
    • High-Efficiency DC/DC Power Supplies
    • Server Power, 48-V Telecom, Datacom, and 42-V Automotive Applications

The UCC2897 PWM controller simplifies implementation of the various active clamp/reset and synchronous rectifier switching power topologies.

Based on the UCC2891 active-clamp controller the UCC2897 is a peak current-mode, fixed-frequency, high-performance pulse width modulator. It 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 converter's ON and OFF transitions with regard to the bulk input voltage.

The UCC2897 adds a second level hiccup mode current sense threshold, bi-directional synchronization and the input overvoltage protection functionalities that are not available on the 16-pin UCC2891. The UCC2897 is offered in 20-pin TSSOP (PW) and 20-pin QFN (RTJ) package.

The UCC2897 PWM controller simplifies implementation of the various active clamp/reset and synchronous rectifier switching power topologies.

Based on the UCC2891 active-clamp controller the UCC2897 is a peak current-mode, fixed-frequency, high-performance pulse width modulator. It 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 converter's ON and OFF transitions with regard to the bulk input voltage.

The UCC2897 adds a second level hiccup mode current sense threshold, bi-directional synchronization and the input overvoltage protection functionalities that are not available on the 16-pin UCC2891. The UCC2897 is offered in 20-pin TSSOP (PW) and 20-pin QFN (RTJ) package.
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* Data sheet Advanced Current-Mode Active Clamp PWM Controller datasheet (Rev. G) 17 Dec 2008

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