Comprehensive Guide to the LZC8650C LED Controller IC: Datasheet, Features, and Application Circuitry
Current Sense pin. Connects to the source of the primary MOSFET via a sense resistor to provide cycle-by-cycle current limiting. NC / OVP
For the full technical manual, you can view the LZC8620 series reference or check the manufacturer's product page at Lozenic .
: Controls the secondary output current using information from the primary side, eliminating the need for an optocoupler and secondary control circuitry. Advanced Protection :
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The LZC8650C regulates output current by analyzing the peak primary-side current detected via the CS pin (Pin 4) and the demagnetization time detected via the ZCD pin (Pin 5). The internal DSP engine calculates the exact output current dynamically, keeping the LED brightness stable regardless of fluctuations in the input mains voltage. 3. High Power Factor Mechanism
: Connects to the primary switch source to monitor current. GND : System ground. COMP : Compensation pin for loop stability.
Gate driver pin; connects to the gate of the primary MOSFET .
The reference ground for all internal control loops. Comprehensive Guide to the LZC8650C LED Controller IC:
The IC is designed for safety and longevity in LED lighting applications: www.prismelectronics.co.in Thermal Protection: Built-in hysteresis Over-Temperature Protection (OTP). Voltage Monitoring: cap V sub cap D cap D end-sub Over-Voltage Protection (OVP) and programmable output OVP. Current Management: Cycle-by-cycle current limiting on the CS pin. Short Circuit Support: Integrated output short-to-GND protection. Common Use Cases LED Driver Circuits:
MOSFET 8N70 (700V, 8A rated in TO-220F package).
: Built-in LEB on the current sense input to filter signal glitches. LZC8650C Pin Configuration and Functions
Totem-pole gate driver output. Directly drives the gate of the external high-voltage power MOSFET. VCC : Controls the secondary output current using information
Input pin for chip operation power. Relies on an auxiliary supply wind-off after startup.
+---+--+---+ CMP ---| 1 8 |--- OVP FB ---| 2 7 |--- OTP CS ---| 3 6 |--- VDD GND ---| 4 5 |--- DRV +----------+ Pin Function Dictionary:
Includes cycle-by-cycle current limiting and hysteresis-based thermal protection.