The UCC29900 is a new class of Integral Cycle Control (ICC) controller designed to implement ultra-high efficiency isolated switching power stages. ICC can be employed to achieve ultra-high conversion efficiency over a wide range of load current. The hysteretic mode output voltage control employed exhibits fast transient response, with almost zero output overshoot. Isolation stage efficiencies of >96% have been demonstrated in reference designs.

ICC controllers operate the switching power stage in high efficiency burst mode at all load levels, rather than the more conventional PWM mode.

The UCC29900 is a highly integrated ICC controller, incorporating all the features necessary to implement a wide range of high efficiency designs. The UCC29900 has been designed for ease of use, and incorporates many useful features, including over-current and short-circuit protection, bus under- & over-voltage detection, soft-start and light load management.

• Integral Cycle Control for High Efficiency Burst Mode Operation at all Load Levels
• Allows Easy Use of Low Cost Self-Driven Secondary-Side Synchronous Rectifiers (SRs)
• Advanced Drive Signal Timing Control for Volt-Sec Balance
• Light-Load Mode for Reduced Power Consumption at No Load and Light Load
• Integrated Soft-Start Function
• Frequency Dithering for Improved EMI Reduction
• Bus Voltage UVLO and OVP Sensing
• Current Sense Input for Overcurrent Protection
• SCP Input Pin to Flag Short-Circuit Condition
• Selectable Latching or Hiccup Mode OCP/SCP
• START Output – Ease Startup Bias Design, (allow improved PFC stage startup transient)
• FAULT Output to Indicate Latched Fault State
• APPLICATIONS
  • High Efficiency AC-DC Converters
  • Low Profile & High Density AC-DC Adapters