The LZC8650C is often used in 45W to 110W LED drivers and features the following typical ratings (based on the similar and LZC8620 series): Package Type : SOP-8 (8-pin Surface Mount). Supply Voltage ( VINcap V sub cap I cap N end-sub ) : Typically recommended between 9.5V and 27V. Operating Temperature : Industrial range from -40∘Cnegative 40 raised to the composed with power C +125∘Cpositive 125 raised to the composed with power C
. Senses the auxiliary winding's reflected voltage to control line regulation, detect output zero-current points, and activate output overvoltage protection. 3 CS
The is a high-performance, single-stage flyback and Power Factor Correction (PFC) controller integrated circuit (IC) primarily designed for LED lighting applications. This IC is often utilized in high-power LED drivers (ranging from 45W to 110W) due to its efficiency and primary-side regulation (PSR) capabilities, which eliminate the need for secondary feedback circuits. Key Features and Benefits lzc8650c ic datasheet pdf
: Automatically detects low impedance drops across the output terminals and engages an auto-restart sequence.
[ VCC ] ----------------> ( Internal Bias & UVLO ) | [ MULT ] ---> ( Multiplier Block ) v | [ Control Logic ] ---> [ GATE Driver ] ---> Out [ CS ] ---> ( Over-Current ) ^ | | [ INV ] ---> ( Error Amp ) -------------+ ^ [ ZCD ] ---> ( Zero Crossing Demag ) Constant Current (CC) Control Mechanism The LZC8650C is often used in 45W to
The LZC8650C is primarily utilized in offline LED lighting fixtures, such as LED bulbs, downlights, and tube lights. It operates as a constant current controller, ensuring that the connected LEDs receive a stable current stream despite fluctuations in the input AC voltage. This stability maximizes LED lifespan and eliminates visible flicker. Key Features
Zero-Crossing Detection pin. Senses inductor current zero-crossing via an auxiliary winding resistor divider. Also handles over-voltage protection (OVP). VIN / VDD Senses the auxiliary winding's reflected voltage to control
Gate driver output for the external power MOSFET; clamped at 16V. Power supply input.
Graphs depicting junction-to-ambient thermal resistance ( RθJAcap R sub theta cap J cap A end-sub ) to determine proper PCB heatsinking requirements.
By monitoring the , the IC tracks when the transformer's core energy drops completely to zero. Instead of switching instantly, the controller waits for the MOSFET's drain-to-source voltage ( Vdscap V sub d s end-sub
Current Sense pin. Connects to the source of the primary MOSFET via a sense resistor to provide cycle-by-cycle current limiting. NC / OVP