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SF5549
The SF5549H is a high-performance, high-efficiency, and highly integrated current mode PWM power switch suitable for offline flyback converter applications. In the SF5549H, the PWM switching frequency with random sequencing is fixed at 65KHz and is adjusted to a narrow range. When the output power demand decreases, the IC reduces the switching frequency according to the proprietary η-reducing switching frequency-balancing TM series control to improve power conversion efficiency at light loads. When the output power is below a given value, the IC enters burst mode and provides excellent efficiency with no audio noise. This IC uses SiFirst's proprietary control algorithm to achieve "zero OCP/OPP recovery gap". At the same time, OCP/OPP is compensated for changes in the common line input. This IC has a built-in synchronous slope compensation function to prevent subharmonic oscillations at high PWM duty cycle outputs. The IC also has a built-in soft-start function to reduce stress on the MOSFET during power-up. The SF5549H integrates functions and protections such as undervoltage lockout (UVLO), VCC overvoltage protection (OVP), cycle-by-cycle current limit (OCP), pin float protection, overload protection (OLP), VCC clamping, and leading edge blanking (LEB). The SF5549H is available in a DIP8 package.
Category：
- Product Description
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- Commodity name: SF5549
- 封装: DIP-8
- 品牌: Saiwei Technology
The SF5549H is a high-performance, high-efficiency, and highly integrated current mode PWM power switch suitable for offline flyback converter applications. In the SF5549H, the PWM switching frequency with random sequencing is fixed at 65KHz and is adjusted to a narrow range. When the output power demand decreases, the IC reduces the switching frequency according to the proprietary η-reducing switching frequency-balancing TM series control to improve power conversion efficiency at light loads. When the output power is below a given value, the IC enters burst mode and provides excellent efficiency with no audio noise. This IC uses SiFirst's proprietary control algorithm to achieve "zero OCP/OPP recovery gap". At the same time, OCP/OPP is compensated for changes in the common line input. This IC has a built-in synchronous slope compensation function to prevent subharmonic oscillations at high PWM duty cycle outputs. The IC also has a built-in soft-start function to reduce stress on the MOSFET during power-up. The SF5549H integrates functions and protections such as undervoltage lockout (UVLO), VCC overvoltage protection (OVP), cycle-by-cycle current limit (OCP), pin float protection, overload protection (OLP), VCC clamping, and leading edge blanking (LEB). The SF5549H is available in a DIP8 package.
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