- All
- Product Management
- News
- Introduction
- Corporate Outlets
- FAQ
- Corporate Video
- Corporate Brochure
SF6649
The SF6649 is a high-performance, high-efficiency, and highly integrated current mode PWM controller suitable for offline flyback converter applications. In the SF6649, 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 will reduce the switching frequency according to the proprietary η-balanced 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 the no-load power can be reduced to below 75mW. This IC can achieve "zero OCP/OPP recovery gap" using SiFirst's proprietary control algorithm. The SF6649 also incorporates a proprietary "audio-free OCP compensation" to achieve constant power limiting and audio noise operation under heavy loads when the line input is approximately 90VAC. The SF6649 integrates undervoltage lockout (UVLO), VDD overvoltage protection (OVP), cycle-by-cycle current limiting (OCP), pin float protection, overload protection (OLP), gate clamping, leading edge blanking (LEB), soft start, and other functions and protections. The SF6649 is available in an SOP8 package.
Category：
- Product Description
-
- Commodity name: SF6649
- 封装: SOP-8
- 品牌: Saiwei Technology
The SF6649 is a high-performance, high-efficiency, and highly integrated current mode PWM controller suitable for offline flyback converter applications. In the SF6649, 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 will reduce the switching frequency according to the proprietary η-balanced 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 the no-load power can be reduced to below 75mW. This IC can achieve "zero OCP/OPP recovery gap" using SiFirst's proprietary control algorithm. The SF6649 also incorporates a proprietary "audio-free OCP compensation" to achieve constant power limiting and audio noise operation under heavy loads when the line input is approximately 90VAC. The SF6649 integrates undervoltage lockout (UVLO), VDD overvoltage protection (OVP), cycle-by-cycle current limiting (OCP), pin float protection, overload protection (OLP), gate clamping, leading edge blanking (LEB), soft start, and other functions and protections. The SF6649 is available in an SOP8 package.
◆ Standby power consumption less than 75mW
◆ Built-in 650V power MOSFET
◆ Proprietary η -Balance TM series Control to improve light load efficiency
◆ Proprietary "Zero OCP/OPP Recovery Gap" control
◆ Proprietary "Audio Noise-Free OCP Compensation"
◆ Dmax up to 80%
◆ Fixed 65KHz switching frequency
◆ Built-in frequency conversion
◆ Built-in soft start function
◆ Frequency reduction and burst mode control, energy saving
◆ Built-in synchronous slope compensation
◆ Cycle-by-cycle current limit
◆ Built-in leading edge blanking (LEB)
◆ Current mode control
◆ Pin floating protection
◆ Ultra-low start-up current
◆ Audio noise-free operation
◆ VDD UVLO and OVP
Applications
Offline AC/DC flyback converters
◆ AC/DC adapters
◆ Open-frame switching power supplies
◆ Laptop chargers
Product Message
Please fill in the information accurately, and we will reply to you within 24 hours.
Official Account
E-mail：
Company Address：
Room 819, Dongmei Building, Xiangnan Three District, Minqiang Community, Minzhi Street, Longhua District, Shenzhen
