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SF5545 Scheda tecnica(PDF) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED |
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SF5545 Scheda tecnica(HTML) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED |
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1 / 2 page  ©SiFirst Technology - 1 - Confidential SiFirst_DS_5545_V2.2 SF5545 FEATURES ◆ Less than 100mW Standby Power ◆ Proprietary η -Balance TM Control to Boost Light Load Efficiency ◆ Proprietary “Zero OCP/OPP Recovery Gap” Control ◆ Proprietary “Audio Noise Free OCP Compensation” ◆ Latch Plug-off Protection with External Triggering ◆ Fixed 65KHz Switching Frequency ◆ Built-in Frequency Shuffling ◆ Built-in Soft Start Function ◆ Frequency Reduction and Burst Mode Control for Energy Saving ◆ Built-in Synchronous Slope Compensation ◆ Cycle-by-Cycle Current Limiting ◆ Built-in Leading Edge Blanking (LEB) ◆ Current Mode Control ◆ Pin Floating Protection ◆ Very Low Startup Current ◆ Audio Noise Free Operation ◆ VDD UVLO, OVP & Clamp APPLICATIONS Offline AC/DC Flyback Converter for ◆ AC/DC Adaptors ◆ Open-frame SMPS GENERAL DESCRIPTION SF5545 is a high performance, high efficiency, highly integrated current mode PWM controller for offline flyback converter applications. In SF5545, PWM switching frequency with shuffling is fixed to 65KHz 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 can achieve less than 100mW no load power. The IC can achieve “Zero OCP/OPP Recovery Gap” using SiFirst’s proprietary control algorithm. SF5545 also has built in proprietary “Audio Noise Free OCP Compensation”, which can achieve constant power limiting and can achieve audio noise operation at heavy loading when line input is around 90VAC. SF5545 integrates functions and protections of Under Voltage Lockout (UVLO), VDD Over Voltage Protection (OVP), Cycle-by-cycle Current Limiting (OCP), External Programmable Over Temperature Protection (OTP) and Over Voltage Protection (OVP), Pins Floating Protection, Over Load Protection (OLP), Gate Clamping, VDD Clamping, Leading Edge Blanking (LEB), Soft Start, etc. In SF5545, the external triggered OTP/OVP and VDD OVP are latch plug-off protections. The other protection functions are auto-recovery mode. SF5545 is available in SOT23-6 and DIP-8 packages. TYPICAL APPLICATION η-Balance TM Current Mode PWM Controller |
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