• 800V Power MOS Integrated
• Pseudo Fixed Frequency Control
• Rated Switching Frequency: 60kHz
• Frequency Fold Back and Burst Mode Control
• FSW Modulation to Reduce EMI Noise
• Support Both Flyback and Buck Topology
• PSR/SSR Optional for Flyback Topology
• HV Start Up from DRAIN
• Peak Current Limit: 360mA
• Wide VCC Operating Range: 4.5V~25.5V
• VCC OVP, OLP, OTP, Input OVP(through ENB pin)
• Internal Soft Start Process
• Compact Package: SSOP10

The SY26741 is a peak current mode flyback/buck switcher that integrates 800V MOS and controller together. It features pseudo fixed frequency control which can avoid sub-harmonic oscillation at CCM and duty>50%. Frequency fold back control is adopted to achieve high efficiency at medium/light load condition. It will enter burst mode at very light or no load condition. When used in flyback topology, IC can be configured to be either PSR or SSR mode. SY26741 has wide VCC operating range from 4.5V to 25.5V, which can support buck converter with as low as 5V output. SY26741 integrates HV start up to achieve fast start up.

The SY26741 also provides comprehensive and reliable protections including VCC OVP, OLP, OTP, input/output OVP (through ENB pin).

The SY26741 is available with compact SSOP10 package.