The SDH8666Q is a quasi-resonant current mode PWM+PFM controller with high-voltage startup, built-in high voltage power MOSFET, and external sensing resistor, is applicable to SMPS applications.
The SDH8666Q integrates a high-voltage startup constant current source, features low standby power dissipation (<40mW). At heavy load conditon, it operates in QR mode to reduce switch loss in the high line input voltage, and it operates with fixed frequency (65KHz) in CCM mode in the low line input voltage. At medium load or light load conditons, it works in QR+PFM mode to improve the conversion efficiency. At no load conditon, it enters burst mode to reduce the standby power dissipation.
The SDH8666Q has frequency jitter function to improve EMI performance. The available peak current compensation function ensures the limit output power consistency even with different AC input voltages. The soft startup reduces the device stress during power-on process.
The SDH8666Q integrates complete protections including VCC overvoltage protection, output over-load protection, output overvoltage protection, leading edge blanking, cycle-by-cycle peak current limit, AC input voltage undervoltage protection and over temperature protection, etc.
SDH8666Q supports adapter applications up to 36W.
Low standby power dissipation<40mW
QR mode for low EMI and low switch loss
PFM mode at light load condition for higher conversion efficiency
Entering burst mode at no load condition
Frequency rising at low voltage and heavy load condition for high limit output powerw Frequency jitter for low EMI
Peak current compensation
VCC overvoltage protection
Output overload protection
Leading edge blanking
Cycle-by-cycle current limit
Output diode short protection
Undervoltage protection for AC input voltage
Adjustable output overvoltage protection
Over temperature protection
|Product Name||Package form||Marking||Hazardous Substance Control||Packing Type||Remarks|
|SDH8666QTR||EHSOP-5-325-1.7||SDH8666Q||Halogen free||Tape & Reel|
|title||Types of||Size (KB)||date||Download the latest English version|