: Detects inductor current zero points via the auxiliary winding for QR operation and OVP. VDD : Power supply pin for the IC.
The LED driving current is throttled backwards at an average rate of .
Over-temperature protection configuration. Sets the thermal threshold using an external NTC resistor to initiate current foldback. OVP AC Line voltage over-voltage protection input point. Core Operational Features
: The CS pin continuously limits the maximum peak current flowing through the power MOSFET, preventing transformer saturation.
Integrates active PFC to meet stringent power quality standards. lzc8650c ic datasheet pdf
: Eliminates the need for opto-couplers and secondary control circuits, simplifying the system design .
: Compact residential and commercial luminaires.
You can typically find the full technical documentation through specialized electronics distributors or manufacturer portals:
The following reference structural layout details how the LZC8650C functions inside a non-isolated buck-boost or isolated flyback LED driver framework. Circuit Component Stages: : Detects inductor current zero points via the
Integrated four-stage temperature foldback function to protect the IC by reducing current as temperature rises. Voltage Protection: cap V sub cap D cap D end-sub
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
Cycle-by-cycle current limiting on the CS pin and protection against output short circuits or open LED conditions. „Mouser Electronics“ Lietuva Documentation Links Full Datasheet (PDF): You can access the detailed LZC8650 Preliminary Datasheet via TaoIC. Alternative Source: A similar part, the DIO8650C Datasheet
You can find detailed PDF versions and technical summaries through the following sources: Over-temperature protection configuration
To ensure system reliability, the IC includes several safety features:
) : Calculate the primary-side peak current value using the maximum power capacity of the core. Ensure the sense resistor is non-inductive to prevent unwanted signal deviations on Pin 3.
The internal parameters of the LZC8650C ensure safe, predictable power limits across universal input voltages (typically ranging from ). Below are the key electrical characteristics derived from the LZC8650 technical documentation : Electrical Characteristics ( VDDcap V sub cap D cap D end-sub Turn-on Voltage ( VDDONcap V sub cap D cap D cap O cap N end-sub ): 19.8V (Typical) VDDcap V sub cap D cap D end-sub Turn-off Voltage ( VDDOFFcap V sub cap D cap D cap O cap F cap F end-sub ): 8.0V (Typical) Startup Current ( ISTcap I sub cap S cap T end-sub ): 10 A (Maximum) Operating Current ( IOCcap I sub cap O cap C end-sub ): 1.5 mA ( VDDcap V sub cap D cap D end-sub Over-Voltage Protection ( VDDOVPcap V sub cap D cap D cap O cap V cap P end-sub ): 27V OTA Reference Voltage ( VREFcap V sub cap R cap E cap F end-sub ): 253.0 mV Cycle-by-Cycle Current Limit ( VCS_LIMcap V sub cap C cap S _ cap L cap I cap M end-sub ): 1.1V Leading-Edge Blanking Time ( TBK_CScap T sub cap B cap K _ cap C cap S end-sub ): 400 nS LZC8650C Pin Configurations and Functions
An internal thermal sensor tracks the silicon die temperature. If it crosses approximately 150∘C150 raised to the composed with power C