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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SF5539DP датащи(PDF) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED |
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SF5539DP датащи(HTML) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED |
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1 / 2 page  ©SiFirst Technology - 1 - Confidential SiFirst_DS_5539_V1.0 SF5539 FEATURES ◆ Less than 75mW Standby Power ◆ Built-in 600V Power MOSFET ◆ Programmable OLP Debounce Time ◆ Proprietary η -Balance TM Control to Boost Light Load Efficiency ◆ Proprietary “Zero OCP/OPP Recovery Gap” Control ◆ 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) APPLICATIONS Offline AC/DC Flyback Converter for ◆ AC/DC Adaptors ◆ Open-frame SMPS GENERAL DESCRIPTION SF5539 is a high performance, high efficiency, highly integrated current mode PWM power switch for offline flyback converter applications. In SF5539, PW M 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 proprietary η -Balance TM 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. SF5539 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. SF5539 is available in DIP8 packages. TYPICAL APPLICATION EMI Filter AC IN SF5539 DC Out TL431 1 VDD FB CS GND CT 2 3 4 8 7 6 5 GND Drain Drain η-Balance TM PWM Power Switch Fixed 50KHz Fsw |
Аналогичный номер детали - SF5539DP |
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Аналогичное описание - SF5539DP |
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