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SF5539H
The SF5539H is a high-performance, high-efficiency, and highly integrated current mode PWM power switch suitable for offline flyback converter applications. In the SF5539H, the PWM switching frequency with random playback is fixed at 65KHz and is adjusted to a narrower range. When the output power demand decreases, the IC reduces the switching frequency according to the proprietary η-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 SF5539H 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 SF5539H is available in DIP8 and DIP7 packages.
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- Product Description
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- Commodity name: SF5539H
- 封装: DIP-8
- 品牌: Saiwei Technology
The SF5539H is a high-performance, high-efficiency, and highly integrated current mode PWM power switch suitable for offline flyback converter applications. In the SF5539H, the PWM switching frequency with random playback is fixed at 65KHz and is adjusted to a narrower range. When the output power demand decreases, the IC reduces the switching frequency according to the proprietary η-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 SF5539H 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 SF5539H is available in DIP8 and DIP7 packages.
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