SC3806 Datasheet | Safety-Chip

Description The SC3806 is a controller for power factor correction, switched mode power supplies. Internally synchronized leading-edge PFC and trailing-edge PWM in one IC. Its input current shaping is close to the leading edge modulation average current topology. SC3806 allows the use of smaller, lower cost bulk capacitors, reduces power line loading and stress on the switching FETs, and results in a power supply fully pliant to IEC1000-3-2 specifications. An over-voltage parator shuts down the PFC section in the event of a sudden decrease in load. The PFC section also includes peak current limiting and input voltage brownout protection. The PWM section can be operated in current mode or voltage mode, at up to 200 KHz, and includes an accurate 50% duty cycle limit to prevent transformer saturation. SC3806’s PWM can be used in current or voltage mode. In voltage mode, feed-forward from the PFC output bus can reduce secondary out ripple. Typical Application PFC and PWM bo Controller Features - Internally synchronized PFC and PWM - Slew rate enhanced voltage error amplifier with advanced input current shaping technique - Average current, continuous boost leading edge PFC - PFC using Input Current Shaping Technique - High PF with low total harmonic distortion - Reduced ripple current in bulk capacitor between PFC and PWM sections - Current-fed gain modulator for improved noise immunity - Overvoltage and brown-out protection, UVLO, and soft start - SOP16 and DIP-16 package Applications Offline AC/DC flyback converter for - PC power supply - Monitor power supply - Internet server power supply AC IN ISEN VREF VRMS PFCDRV P PWMDRV RAMP T1B T1A T1 © Safety-Chip Micro SC3806_Datasheet_V1.0_EN...