Electronic component SF1539HT DVB DVC Power manager IC

• shape: Flat
• Conductive Type: Unipolar Integrated Circuit
• Integration: LSI
• Technics: Thin Film IC
• Application: Standard Generalized Integrated Circuit
• Type: Digital / Analog IC
• Model NO.: SF1539HT
• Color: Black
• Transport Package: Carton
• Trademark: Chipown
• Origin: China
• HS Code: 8541290000
• Production Capacity: 100000

Product Description

-Data Sheet

* General Description

SF1539HT is a high performance, high efficiency, highly integrated current  mode  PWM   power   switch   for offline flyback converter applications. 
In SF1539, PWM switching frequency with shuffling is fixed to 50KHz and is trimmed to tight range. When the  output power demands  decrease,   the  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.

SF1539 integrates functions and protections of Under Voltage  Lockout  (UVLO), 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.
SF1539 is available in DIP8 packages.





* Features

  -Built-in 600V Power MOSFET 
   -Proprietary η  -BalanceTM  Control  to Boost Light Load Efficiency
   -Proprietary  "Zero  OCP/OPP  Recovery Gap Contro
   -Fixed 50KHz 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)



* Application

-Offline AC/DC Flyback Converter for

-AC/DC Adaptors 
-Open-frame SMPS
-Set-Top Box Power Supplies
-ATX Standby Power

* Package-Order information / Typical application circuit

Notes

* The pictures are taken by camera.
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