Any unique or thermal conditions for the design.
The is a high-performance, single-stage Primary-Side Regulation (PSR) LED driver controller engineered by Lozen Semiconductor (菱奇半导体). Operating in high-efficiency Quasi-Resonant Mode (QRM) , this integrated circuit (IC) eliminates the need for optocouplers and secondary-side control feedback loops, significantly minimizing both system bill-of-materials (BOM) cost and PCB space. It features advanced safety integrations, including an adaptive four-stage temperature current-foldback system and dedicated AC input overvoltage/undervoltage protection (OVP/UVP), making it highly popular in high-power (45W to 110W+) commercial and industrial LED driver topologies. Core Structural and Architectural Design
Typically achieves a power factor >0.95 and low Total Harmonic Distortion (THD < 10%) at standard AC voltages. Quasi-Resonant Mode (QRM):
I can provide specific component values, transformer turn ratios, and troubleshooting steps tailored to your design constraints. Share public link
: Connection for an NTC resistor to enable thermal compensation. Typical Application lzc8650c ic datasheet pdf
Once VCC reaches the turn-on threshold, the GATE pin outputs pulses to drive the external MOSFET.
: Current sense pin connected to a resistor for MOSFET current monitoring. GND : Power ground.
: Internal thermal sensors shut down the IC if internal temperatures exceed safe operating limits, preventing thermal runaway. 6. Typical Application Circuit Design Notes
AC Input (85 - 300 Vac) ---> EMI Filter / Surge Protection (MOV 10D621 x3) | Bridge Rectifier | CBB Bulk Capacitor (334/630V) | +------------+------------+ | | Flyback Transformer (EE22/13) LZC8650C Controller | (SOP-8 Package) | | MOSFET Switch (8N70 TO-220F) <------+ (DRV Pin 5 Driving Output) | Current Sense Shunt -------------> (CS Pin 3 Sense Feedback) Any unique or thermal conditions for the design
Totem-pole gate driver output. Directly drives the gate of the external high-voltage power MOSFET. VCC
The LZC8650C is a highly efficient, single-stage Power Factor Correction (PFC) controller designed specifically for constant current LED lighting applications. It is widely used in commercial, industrial, and residential LED drivers due to its excellent regulation, low total harmonic distortion (THD), and cost-effective design.
Your targeted and desired output current/voltage specs. The specific MOSFET part number you intend to drive.
Current Sense pin. Connects to the source of the primary MOSFET via a sense resistor to provide cycle-by-cycle current limiting. NC / OVP Typical Application Once VCC reaches the turn-on threshold,
Output of the error amplifier. A compensation capacitor is connected here to stabilize the primary-side control loop.
Power supply pin for the IC control logic and gate drive. Requires a local bypass decoupling capacitor. 3. Internal Block Diagram and Theory of Operation
The LZC8650C is a highly sought-after integrated circuit (IC) that has garnered significant attention in the electronics industry. As a crucial component in various applications, it's essential to have access to reliable and detailed information about this IC. In this article, we'll delve into the world of the LZC8650C, exploring its datasheet in PDF format, and providing an in-depth analysis of its features, specifications, and applications.
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
This controller supports both isolated flyback and non-isolated Buck-Boost topologies. It utilizes an advanced primary-side constant current control strategy, eliminating the need for an optocoupler and secondary-side control circuits, which significantly simplifies the power supply design.