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SF5559
The SF5559 is a high-performance, high-efficiency, and highly integrated current mode PWM controller suitable for offline flyback converter applications. The OLP debounce time is programmable in the SF5559. The PWM switching frequency with random playback in the SF5559 is fixed at 65KHz and is adjusted to a strict range. When the output power demand decreases, the IC will reduce the switching frequency according to the proprietary η-balance TM series control to improve the power conversion efficiency at light loads. When the output power is below a given value, the IC enters burst mode, and the no-load power can be reduced to below 75mW. The IC can achieve "zero OCP/OPP recovery gap" using SiFirst's proprietary control algorithm. The SF5559 also incorporates a proprietary "audio noise-free OCP compensation" to achieve constant power limiting and enable audio noise operation under heavy loads when the line input is approximately 90VAC. The SF5559 integrates functions and protections such as undervoltage lockout (UVLO), VDD overvoltage protection (OVP), cycle-by-cycle current limiting (OCP), pin float protection, overload protection (OLP), gate clamping, VDD clamping, leading edge blanking (LEB), and soft start. The SF5559 is available in a DIP8 package.
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- Product Description
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- Commodity name: SF5559
- 封装: DIP-8
- 品牌: Saiwei Technology
The SF5559 is a high-performance, high-efficiency, and highly integrated current mode PWM controller suitable for offline flyback converter applications. The OLP debounce time is programmable in the SF5559. The PWM switching frequency with random playback in the SF5559 is fixed at 65KHz and is adjusted to a strict range. When the output power demand decreases, the IC will reduce the switching frequency according to the proprietary η-balance TM series control to improve the power conversion efficiency at light loads. When the output power is below a given value, the IC enters burst mode, and the no-load power can be reduced to below 75mW. The IC can achieve "zero OCP/OPP recovery gap" using SiFirst's proprietary control algorithm. The SF5559 also incorporates a proprietary "audio noise-free OCP compensation" to achieve constant power limiting and enable audio noise operation under heavy loads when the line input is approximately 90VAC. The SF5559 integrates functions and protections such as undervoltage lockout (UVLO), VDD overvoltage protection (OVP), cycle-by-cycle current limiting (OCP), pin float protection, overload protection (OLP), gate clamping, VDD clamping, leading edge blanking (LEB), and soft start. The SF5559 is available in a DIP8 package.
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