SD8666QS
SD8666QS is a quasi resonant current mode PWM + PFM controller with built-in high-voltage power MOSFET and external sampling resistance for switching power supply.
SD8666QS has multiple mode control: under heavy load, it works in QR mode at high voltage, which can reduce switching loss, and CCM mode with fixed frequency (65khz) at low voltage. Working in QR + PFM mode under medium load and light load can improve the conversion efficiency. Under no-load, enter the burping mode to effectively reduce the standby power consumption of the circuit.
Main features:
u QR mode improves EMI and reduces switching loss
u PFM mode under light load to improve efficiency
u Enter burping mode when no-load
u Increasing frequency of low voltage and heavy load to increase the limit output power
u Frequency buffeting to improve EMI
u Peak current compensation
u Soft start
u VCC overvoltage protection
u over load protection
u Leading edge blanking
u Cycle by cycle peak current limiting
u Output diode short circuit protection
u AC input voltage undervoltage protection
u Externally settable output overvoltage protection
u Over temperature protection
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