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. Sd8666qs has frequency buffeting function to reduce EMI. With peak current compensation function, it can keep the limit output power consistent under different AC input voltages. There is also a soft start function to reduce the device stress during power on. Sd8666qs integrates various abnormal state protection functions, including VCC overvoltage protection, output overload protection, output overvoltage protection, leading edge blanking, cycle by cycle peak current limiting, output diode short-circuit protection, AC input voltage undervoltage and overtemperature protection, etc.
Main features:
QR mode improves EMI and reduces switching loss
PFM mode under light load to improve efficiency
enter burping mode when no-load
low voltage heavy load frequency increase to improve the limit output power
frequency buffeting to improve EMI
peak current compensation
soft start
VCC overvoltage protection
output overload protection
leading edge blanking
cycle by cycle peak current limiting
output diode short circuit protection
AC input voltage undervoltage protection
external settable output overvoltage protection
overtemperature protection
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