Loop compensation pin. An external RC network is connected here to stabilize the control loop. MULT
The LZC8650C is typically housed in an 8-pin package to accommodate advanced diagnostic and safety functions, such as dedicated input overvoltage protection and NTC-driven temperature thermal foldback. Pin Number Description CMP
Place the VCC decoupling capacitor as close as possible to Pin 8 and Pin 6 (GND) to suppress high-frequency switching noise.
Often
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The LZC8650C operates primarily in Boundary Conduction Mode (BCM), which significantly reduces switching losses and eliminates diode reverse recovery losses. Value / Range Flyback / Buck-Boost Control Mode Primary-Side Regulation (PSR) Power Factor (PF) Total Harmonic Distortion (THD) < 10% (typically) VCC Operating Range 10V to 25V Start-up Current Package Type SOP-8 / DIP-8 Pin Configuration and Functions
The LZC8650C includes several safety features to enhance system reliability : lzc8650c ic datasheet pdf
Detailed Overview of the LZC8650C Integrated Circuit The is a highly efficient, single-stage, primary-side regulation (PSR) controller designed by Lozen Semiconductor . It is primarily utilized in isolated offline AC/DC flyback power converters targeting high-performance LED lighting systems . The chip stands out due to its active power factor correction (PFC) capabilities, line voltage over-voltage protection (OVP), and an intelligent over-temperature current-foldback system.
These inputs have high impedance and are vulnerable to stray electromagnetic pickup. Keep traces running from the sense resistors to Pins 1 and 4 as brief as possible, and route them far away from the noisy drain node of the MOSFET.
: After startup, an auxiliary winding on the transformer provides continuous power to the VCC pin via a fast recovery diode and filtering capacitor. Ensure this voltage sits comfortably between the UVLO limits. 7. Conclusion Loop compensation pin
Crucial for wide-input range designs (e.g., 90V AC to 265V AC).
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Standard SOP-8 variants of this IC generally follow this functional pinout: Pin Number Description CMP Place the VCC decoupling