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发布者:微桥 发布时间:2012-2-21 阅读:3929次    关键字: QR AC-DC
SP6878-Quasi-Resonant PWM Controller


SP6878-Quasi-Resonant PWM Controller DataSheet

DESCRIPTION
    The SP6878 is a low cost, quasi-resonant flyback controller where the maximum frequency is below 100KHz. The internal valley detector ensures the converter operates at quasi-resonant operation over wide range of line voltage. To reduce the standby power loss and increase the efficiency at light load, a proprietary burst mode design is applied. It would provide the users a superior AC/DC power application of higher efficiency, low external component counts, and lower cost solution for applications.
    The SP6878 features more protections or functions for the following characteristics: over voltage protection (OVP); over temperature protection (OTP); over load protection (OLP). SP6878 is available by SOP-8/ DIP-8P packages.

FEATURES
 High-Voltage BCD Process
 Under Voltage Lockout (UVLO )
 Quasi-Resonant Control
 Internal 4ms Soft Start
 Over Temperature Latch Shutdown
 OLP (Over Load Protection)
 OVP (Over Voltage Protection) on Vcc Pin
 100KHz Maximum Frequency
 800mA Driving Capability

APPLICATIONS
 AC/DC Switching Power Adaptor
 Set-top Box Power Supply
 Open-Frame Switching Power Supply

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