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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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