Power Switch Fixed 65kHz Fsw Balance TM PWM ISF1539HT C

• shape: DIP
• Conductive Type: Unipolar Integrated Circuit
• Integration: LSI
• Technics: Thin Film IC
• Application: Standard Generalized Integrated Circuit
• Type: Digital / Analog IC
• Model NO.: SF1539HT
• Feature: Low Standby
• Trademark: Sifirst
• Origin: China
• HS Code: 8542399000
• Production Capacity: 10000000

Product Description

Datasheet

General 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 Circuit





Why 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
 

Warranty	1 Year
Lead time	3-7 Days

Notes

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2.You can contact us for a better price.
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