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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SF1539HTDP датащи(PDF) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED |
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SF1539HTDP датащи(HTML) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED |
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1 / 2 page  ©SiFirst Technology - 1 - Confidential SiFirst_DS_1539HT_V1.1 SF1539HT FEATURES ◆ Built-in 600V Power MOSFET ◆ Over Temperature Protection (OTP) ◆ Proprietary η -Balance TM 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 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 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. 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. TYPICAL APPLICATION EMI Filter AC IN SF1539HT DC Out TL431 1 VDD FB CS GND RT 2 3 4 8 7 6 5 GND Drain Drain NTC η-Balance TM PWM Power Switch Fixed 65KHz Fsw and OTP Protection |
Аналогичный номер детали - SF1539HTDP |
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Аналогичное описание - SF1539HTDP |
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