1 / 18

Fairchild Power Switch(FPS) TV Solution Power Conversion

Fairchild Power Switch(FPS) TV Solution Power Conversion. Features and Advantages of FSCQ-series. Features Optimized for Quasi-resonant converter (Low EMI and High Efficiency) Fully avalanche rated and 100% tested SenseFET Pulse-by-pulse current limiting

rmeredith
Download Presentation

Fairchild Power Switch(FPS) TV Solution Power Conversion

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Fairchild Power Switch(FPS) TV SolutionPower Conversion

  2. Features and Advantages of FSCQ-series • Features • Optimized for Quasi-resonant converter (Low EMI and High Efficiency) • Fully avalanche rated and 100% tested SenseFET • Pulse-by-pulse current limiting • Improved reliability through various protection functions •  Over voltage, Over load, Over current, Thermal shutdown • Advanced Burst operationfor low power consumption in standby (<1W) • Internal Soft start function (20ms) • Extended Quasi-resonantoperation for wide operation range • Reduced startup and operating currents • Advantages • Reduced board space (simple & compact circuit design) • Decreased assembly time and field failure rate Enhanced productivity

  3. FSCQ-series Functional Block Diagram QRC Control Burst Mode Operation SenseFET OLP Current Mode Control AOCP TSD OVP Auto Restart Mode Latch Mode

  4. FPS lineup for CRT-TV application

  5. KA5Q series V.S FSCQ-series

  6. Power Consumptions in standby mode

  7. Typical Application circuit

  8. Normal Quasi-Resonant Switching • Advantages • Reduced switching noise (Low EMI) • Improved efficiency • Removed RCD snubber

  9. Normal Quasi-Resonant Switching • Limitations • Intermittent switching at light load due to a relatively large LEB time • Increased switching loss at light load

  10. Extended Quasi-Resonant Switching • Advantages • Guarantee stable operation over wide load range • Improve efficiency at light load condition

  11. Internal Soft-start 85V input 265V input • Internal soft start (20ms) • For a fast output build up, offset is introduced in the soft start

  12. Over load Protection - Output short 85V input 265V input

  13. Abnormal over current protection – Diode short 85V input 265V input

  14. Over voltage protection -Feedback open 85V input 265V input

  15. Burst operation - basic features • Drop output voltage to below half (any level) to minimize the loss caused by leakage current in the high voltage output • Reduce the effective switching frequency to minimize switching loss • Reduce the FPS operating current in the burst operation

  16. Burst operation - Output drop circuit • Normal mode : Vo1 (B+) is regulated • Standby mode : Vo2 is regulated

  17. Burst operation waveforms Normal  Standby Standby  Normal

  18. Burst operation waveforms Vi=85Vac Vi=265Vac 1. Vds 2. Vcc 3. Vfb 4. Id

More Related