SF1539HT Balance TM PWM Power Switch Fixed 65kHz Fsw IC

DatasheetGeneral Description   SF1539HT  is  a  high  performance,   high  efficiency, highly integrated current mode PWM power switch for offline flyback converter applications.  In  SF1539HT,  PWM    switching    frequency   with shuffling  is  fixed  to  65KHz  and  is  trimmed  to  tight range.  When  the  output  power  demands  decrease, he  IC  decreases  switching  frequency  based  on  the proprietaryη  -BalanceTM  control  to   boost  power conversion  efficiency  at  the light load.  When  output power  falls  below  a  given  value,  the  IC  enters  into burst mode and provides excellent efficiency without audio noise. The IC can achieve "Zero OCP/OPP Recovery Gap" using SiFirst's proprietary control algorithm. Meanwhile, the OCP/OPP variation versus universal line input is compensated.  The IC has built-in synchronized slope compensation to prevent sub-harmonic oscillation at high PWM duty output. The IC also has built-in soft start function to soften  the  stress  on  the  MOSFET  during  power  on period. SF1539HT  integrates  functions   and  protections  of Under  Voltage  Lockout  (UVLO),  Over  Temperature Protection   (OTP), VCC  Over  Voltage   Protection (OVP),  Cycle-by-cycle  Current  Limiting  (OCP),  Pins Floating   Protection,  Over   Load  Protection   (OLP), VCC Clamping, Leading Edge Blanking (LEB), etc.SF1539HT is available in DIP8 packages. Features  Built-in 600V Power MOSFET   Over Temperature Protection (OTP)  Proprietary η  -BalanceTM  Control  to  Boost Light Load Efficiency  Proprietary  "Zero  OCP/OPP  Recovery Gap Control   Fixed 65KHz Switching Frequency  Built-in Soft Start Function  Very Low Startup Current  Frequency Reduction and Burst Mode Control for Energy Saving  Current Mode Control  Built-in Frequency Shuffling  Built-in Synchronous Slope Compensation   Cycle-by-Cycle Current Limiting  Built-in Leading Edge Blanking (LEB)  Constant Power Limiting    Pins Floating Protection   Audio Noise Free Operation   VDD OVP & Clamp  VDD Under Voltage Lockout (UVLO)Applications  Offline AC/DC Flyback Converter for  AC/DC Adaptors   Open-frame SMPS  Set-Top Box Power Supplies   ATX Standby Power Package/Order Information Typical CircuitWhy choose us?* Specilaze in IC for around 14 years  * 100% Tested before sale * Cooperate with over 35 famous brands from domestic and international market * Competitive and reasonable price  * Abundant inventory and short lead time * 24hrs supports from our sales and R&D team   Warranty1 YearLead time3-7 DaysNotes1.The pictures are taken by camera. 2.You can contact us for a better price. 3.Feel free to contact us if you would like to see other models. Our company  /* January 22, 2024 19:08:37 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1