The LZC8650 datasheet highlights built-in protections including:
: Trace paths running from the source of the external MOSFET to the CS pin should be clean and direct. Place the current-sense resistor directly next to the GND pins to prevent parasitic trace inductance from corrupting the current readings.
The LZC8650C shines because of its use of (PSR). This means the chip regulates the output current by sensing the primary-side information without needing a feedback loop from the secondary side. This dramatically reduces component count, cost, and PCB size. Furthermore, it operates in Quasi-Resonant Mode (QRM) which maximizes efficiency by reducing the MOSFET's switching losses and minimizing EMI, while its valley detection circuit ensures consistent current accuracy even as the line voltage fluctuates.
Operates in QR mode with valley turn-on of the MOSFET to achieve high efficiency and low switching losses. lzc8650c ic datasheet pdf better
: Integrated protection against FB (Feedback) pin open/short and CS (Current Sense) pin open circuits. Typical Pin Configuration Based on the related LZC86xx series architecture: CMP : Loop compensation for constant current regulation.
: Connects an external RC network to ground to stabilize the constant-current regulation loop.
Just let me know what you're working on! Share public link This means the chip regulates the output current
Recommended junction temperature of -40°C to 125°C. Protection Suite: Cycle-by-cycle current limiting on the CS pin. Building-in hysteresis Over-Temperature Protection (OTP). VDD and output Over-Voltage Protection (OVP). Output short-circuit and open-circuit protection. Technical Parameters (Reference) Typical Value / Rating Max Supply Voltage (VIN) 33V (Absolute Max) Operating Current Output Current Precision ±3% to ±5% (Application dependent) Thermal Resistance (SOIC-8) 100 °C/W (ΘJA) Switching Mode Quasi-Resonance for reduced MOSFET losses
Detects transformer demagnetization to operate in Boundary Conduction Mode (BCM). 4. How to Get a Better Design with LZC8650C To achieve superior ("better") performance using the Go to product viewer dialog for this item. , follow these design guidelines: A. Optimize Transformer Design
: Current sense pin for cycle-by-cycle MOSFET current limiting. GND : Power ground. DRV : Totem-pole output to drive the external power MOSFET. Operates in QR mode with valley turn-on of
A high-voltage MOSFET (e.g., 600V-800V) with suitable
Both offer PSR, high PF, and comprehensive protection.
Generally
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The LZC8650C functions in . Working in QRM drastically minimizes switching losses by ensuring the external power MOSFET turns on only at the lowest voltage point (the valley) of the transformer's resonant oscillation. Standard Value / Feature Topology Support Isolated Flyback & Non-Isolated Buck-Boost Control Method Primary Side Regulation (PSR) Power Factor (PF) > 0.95 at 230VAC (High Efficiency) Total Harmonic Distortion (THD) < 10% under full load constraints Switching Performance Quasi-Resonant Mode (QRM) Package Configurations 8-Pin SOIC-8 or Compact Packages Pinout Configuration and Functional Assignments