illustrate

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

Based on the UCC2891 active clamping controller UCC2897 is a peak current mode, fixed frequency, high performance pulse width modulator. It includes the ability to drive logic and critical delay auxiliary switches for P-channels as well as an easy way to properly program active clamp operation.

Features include internally programmable slope compensation circuitry, accurate D_utmostThe limit, a synchronizable oscillator timing capacitor, is internal. The accurate online monitoring function also plans the converter's on/off transition with respect to the high-capacity input voltage.

characteristic

• Ideal for active clamping/reset forward, flyback, and synchronous rectification applications
• A complementary auxiliary driver with programmable dead time (turn-on delay) is provided between the AUX and the main switch
• The peak current mode control period limits the period to the periodic current by 0.5 - V
• Hiccup mode 0.75 - V current limit
• TrueDrive™2 sinks, 2 source outputs
• 110 - V input boot device
• Downwarded accurate line UV and OV threshold line internal bandgap references
• Programmable slope compensation
• High performance 1.0 - MHz synchronous internal oscillator timing capacitor
• Precisely programmable maximum duty cycle
• Pb-free lead package complete
• apply
  • High efficiency DC/DC power supply
  • Server power supplies, 48 V telecom, datacom, and 42 - 42V automotive applications