Iout=12×Vcs_thRcs×ToffTsw×Ncap I sub o u t end-sub equals one-half cross the fraction with numerator cap V sub c s _ t h end-sub and denominator cap R sub c s end-sub end-fraction cross the fraction with numerator cap T sub o f f end-sub and denominator cap T sub s w end-sub end-fraction cross cap N (Where Vcs_thcap V sub c s _ t h end-sub is the internal current sense threshold, Rcscap R sub c s end-sub is the sense resistor value, and represents the transformer turns ratio.) Quasi-Resonant (QR) Switching

The IC utilizes valley turn-on for the primary MOSFET, which reduces switching losses and EMI. Four-Segment Temperature Foldback:

Output pin connected to the gate of an external power MOSFET to handle switching.

The following reference structural layout details how the LZC8650C functions inside a non-isolated buck-boost or isolated flyback LED driver framework. Circuit Component Stages:

. Connects to an external sensing resistor at the source of the primary MOSFET to monitor cycle-by-cycle peak current. 4 GND

Here’s the best way to proceed:

Eliminates the need for traditional TL431 and optocoupler feedback loops, streamlining layout and physical space requirements.

) to swing down to its minimum value (the valley) before initiating the next conduction cycle. This drastically minimizes capacitive turn-on switching losses and lowers electromagnetic interference (EMI) signatures. 3. Four-Stage Temperature Foldback (OTP Pin)

: Achieves a high power factor (PF > 0.95) for better energy efficiency .