For engineers, the LZC8650C datasheet PDF is more than a list of numbers; it is the blueprint for product success.
The LZC8650C is a Primary-Side Regulation (PSR) controller designed for offline AC/DC flyback power converters, specifically targeting LED lighting applications. Manufactured by Lozen Technology (菱奇半导体), this IC is known for achieving a high power factor and accurate real-current control. Technical Overview Package Type: SOP-8 (8-pin Surface Mount).
Application: High-power isolated LED drivers, typically used in LED bulbs and tube lighting.
Control Method: Primary-side modulation (PSR), which eliminates the need for an optocoupler and secondary-side control circuitry, reducing cost and size. Key Performance Specifications
Based on typical configurations for this series (including related models like DIO8650C or LZC8620): Supply Voltage ( VDDcap V sub cap D cap D end-sub ): Typically operates between 9.5V and 27V. Maximum VINcap V sub cap I cap N end-sub /Drive: Up to 33V.
Power Dissipation: Approximately 1.1W for the SOIC-8 package. lzc8650c ic datasheet pdf
Thermal Resilience: Rated for junction temperatures from -40°C up to 125°C. Protection Features
The LZC8650C integrates several safety mechanisms to ensure driver longevity:
Input Protection: Over-voltage (OVP) and under-voltage (UVP) protection.
Thermal Management: Built-in hysteresis Over-Temperature Protection (OTP) and an output current foldback feature that reduces current as temperature rises.
Fault Protection: Output short-to-ground protection and cycle-by-cycle current limiting on the CS pin. For engineers, the LZC8650C datasheet PDF is more
Temperature Compensation: Supports external NTC resistor connection for precise thermal adjustment. Pin Configuration (SOP-8) Description COMP Loop compensation for constant current regulation. FB Feedback pin; detects zero current to regulate output. CS
Current sense pin; connects to a resistor to sense MOSFET current. GND Power ground. DRV
Gate drive output for the external power MOSFET (clamped at 16V). VDD Power supply input. TS Temperature compensation point setting. RN NTC resistor connection for thermal compensation.
For the full technical manual, you can view the LZC8620 series reference or check the manufacturer's product page at Lozenic.
Here’s the best way to proceed:
Without proper thermal design, the LZC8650C will enter thermal shutdown or fail prematurely. The datasheet provides:
To understand the utility of the LZC8650C, one must look at its internal architecture as defined in the datasheet. The IC is typically housed in compact packages (such as SOP-8 or SOT-23-6 variants depending on the specific revision), allowing for high-density PCB layouts.
Use datasheet aggregators:
Check for equivalent ICs – If this is a power management IC (e.g., LED driver, DC-DC converter), common similar parts are PT4115, LZC8650, or SY8710.