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SF5873
The SF5873 is a high-performance, 2-neodymium quasi-resonant (QR-IITM series) PWM controller for offline flyback power converter applications. Built-in proprietary high-voltage-milliwattTM series technology and QR-II typeTM series technology with advanced protection features enhance the reliability and performance of the SMPS. The "digital anti-jitter" function in the SF5873 automatically selects and locks the valley value under a given load, achieving audio noise-free operation. On the other hand, the "digital frequency jitter" function provides the system with superior EMI performance compared to traditional QR systems. The SF5873 is a multi-mode controller. At full load, the IC operates in CCM mode or QR mode according to the AC line input. When the load becomes lighter, the IC enters "digital frequency foldback" mode to improve power conversion efficiency. When the output power is very small, the IC enters burst mode, achieving no-load power less than 50mW. The SF5873 integrates functions and protections such as undervoltage lockout (UVLO), VDD overvoltage protection (VDD OVP), output overvoltage protection (Output OVP), cycle-by-cycle current limit (OCP), pin float protection, overload protection (OLP), soft start, VCC clamping, and gate clamping. In the SF5873, VDD OVP and output OVP are latch-mode protections, while other protections are auto-recovery mode. The SF5873 is available in an SOP8 package.
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- Product Description
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- Commodity name: SF5873
- 封装: SOT23-6
- 品牌: Saiwei Technology
The SF5873 is a high-performance, 2-neodymium quasi-resonant (QR-IITM series) PWM controller for offline flyback power converter applications. Built-in proprietary high-voltage-milliwattTM series technology and QR-II typeTM series technology with advanced protection features enhance the reliability and performance of the SMPS. The "digital anti-jitter" function in the SF5873 automatically selects and locks the valley value under a given load, achieving audio noise-free operation. On the other hand, the "digital frequency jitter" function provides the system with superior EMI performance compared to traditional QR systems. The SF5873 is a multi-mode controller. At full load, the IC operates in CCM mode or QR mode according to the AC line input. When the load becomes lighter, the IC enters "digital frequency foldback" mode to improve power conversion efficiency. When the output power is very small, the IC enters burst mode, achieving no-load power less than 50mW. The SF5873 integrates functions and protections such as undervoltage lockout (UVLO), VDD overvoltage protection (VDD OVP), output overvoltage protection (Output OVP), cycle-by-cycle current limit (OCP), pin float protection, overload protection (OLP), soft start, VCC clamping, and gate clamping. In the SF5873, VDD OVP and output OVP are latch-mode protections, while other protections are auto-recovery mode. The SF5873 is available in an SOP8 package.
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