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Isolated (Low PFC)

FT8350x is one kind of high-precision constant current drivers, which has self-power supply structure and no need feedback winding, no need opto-coupler and 431, enjoying simple and low BOM cost. Working in DCM mode, the driver has adjustable OVP voltage and can meet various LED application of 3~36W.

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Part No. Topology Max V/Pout 90V-265V Power Device CC Dimming Feature
FT8350A PSR 9W Internal NPN ±3% N/A Precision OVP, No Aux Winding

Product Profile :

FT8350x is a high precision primary-side feedback and regulation constant current driver for LED lighting applications. It operates in inductor current discontinuous conduction mode (DCM) and is especially suitable for flyback converter under universal input. Under universal input voltage from 85V to 265V, the system output power is recommended from 3W to 24W respectively of different internal power switch.

The FT8350x integrates a 700V power NPN and eliminates secondary sense and feedback circuit. The loop compensation components are also removed while maintaining stability over all operating conditions. It uses a source drive architecture and patent demagnetization sensing technology with very low operating current, Patents of self power supply technology. the auxiliary winding for sensing the output and supplying the chip is therefore eliminated, resulting in low component counts and small system size. 

With its highly accurate current sense method, the FT8350x realizes ±3% accuracy of LED current along with excellent line and load regulation.

The multi-protection function of FT8350x can greatly enhance the system reliability and safety. The FT8350x features LED open/short circuit protection, CS resistor short circuit protection, over temperature compensation and VCC UVLO protection. The industry leading OVP voltage accuracy ensures the best LED open circuit protection.

Feature :

Built-in 700V power NPN 

PSR constant current control without secondary sense and feedback circuit 

Patents of demagnetization sensing and self power-supply technology

Ultra low operating current for high efficiency

Universal input voltage 

±3% LED current accuracy 

Programmable precision OVP voltage for best LED open circuit protection 

LED short circuit protection 

Patent of CS resistor short circuit protection 

VCC under-voltage protection 

Over temperature compensation 

Available in SOP8 and DIP8 packages 


More details
FT8350C PSR 16W Internal NPN ±3% N/A Precision OVP, No Aux Winding

Product Profile :

FT8350x is a high precision primary-side feedback and regulation constant current driver for LED lighting applications. It operates in inductor current discontinuous conduction mode (DCM) and is especially suitable for flyback converter under universal input. Under universal input voltage from 85V to 265V, the system output power is recommended from 3W to 24W respectively of different internal power switch.

The FT8350x integrates a 700V power NPN and eliminates secondary sense and feedback circuit. The loop compensation components are also removed while maintaining stability over all operating conditions. It uses a source drive architecture and patent demagnetization sensing technology with very low operating current, Patents of self power supply technology. the auxiliary winding for sensing the output and supplying the chip is therefore eliminated, resulting in low component counts and small system size. 

With its highly accurate current sense method, the FT8350x realizes ±3% accuracy of LED current along with excellent line and load regulation.

The multi-protection function of FT8350x can greatly enhance the system reliability and safety. The FT8350x features LED open/short circuit protection, CS resistor short circuit protection, over temperature compensation and VCC UVLO protection. The industry leading OVP voltage accuracy ensures the best LED open circuit protection.



Feature :

Built-in 700V power NPN 

PSR constant current control without secondary sense and feedback circuit 

Patents of demagnetization sensing and self power-supply technology

Ultra low operating current for high efficiency

Universal input voltage 

±3% LED current accuracy 

Programmable precision OVP voltage for best LED open circuit protection 

LED short circuit protection 

Patent of CS resistor short circuit protection 

VCC under-voltage protection 

Over temperature compensation 

Available in SOP8 and DIP8 packages 


More details
FT8350CD PSR 18W Internal NPN ±3% N/A Precision OVP, No Aux Winding

Product Profile :

FT8350x is a high precision primary-side feedback and regulation constant current driver for LED lighting applications. It operates in inductor current discontinuous conduction mode (DCM) and is especially suitable for flyback converter under universal input. Under universal input voltage from 85V to 265V, the system output power is recommended from 3W to 24W respectively of different internal power switch.

The FT8350x integrates a 700V power NPN and eliminates secondary sense and feedback circuit. The loop compensation components are also removed while maintaining stability over all operating conditions. It uses a source drive architecture and patent demagnetization sensing technology with very low operating current, Patents of self power supply technology. the auxiliary winding for sensing the output and supplying the chip is therefore eliminated, resulting in low component counts and small system size. 

With its highly accurate current sense method, the FT8350x realizes ±3% accuracy of LED current along with excellent line and load regulation.

The multi-protection function of FT8350x can greatly enhance the system reliability and safety. The FT8350x features LED open/short circuit protection, CS resistor short circuit protection, over temperature compensation and VCC UVLO protection. The industry leading OVP voltage accuracy ensures the best LED open circuit protection.

Feature :

Built-in 700V power NPN 

PSR constant current control without secondary sense and feedback circuit 

Patents of demagnetization sensing and self power-supply technology

Ultra low operating current for high efficiency

Universal input voltage 

±3% LED current accuracy 

Programmable precision OVP voltage for best LED open circuit protection 

LED short circuit protection 

Patent of CS resistor short circuit protection 

VCC under-voltage protection 

Over temperature compensation 

Available in SOP8 and DIP8 packages 


More details
FT8350DD PSR 24W Internal NPN ±3% N/A Precision OVP, No Aux Winding

Product Profile :

FT8350x is a high precision primary-side feedback and regulation constant current driver for LED lighting applications. It operates in inductor current discontinuous conduction mode (DCM) and is especially suitable for flyback converter under universal input. Under universal input voltage from 85V to 265V, the system output power is recommended from 3W to 24W respectively of different internal power switch.

The FT8350x integrates a 700V power NPN and eliminates secondary sense and feedback circuit. The loop compensation components are also removed while maintaining stability over all operating conditions. It uses a source drive architecture and patent demagnetization sensing technology with very low operating current, Patents of self power supply technology. the auxiliary winding for sensing the output and supplying the chip is therefore eliminated, resulting in low component counts and small system size. 

With its highly accurate current sense method, the FT8350x realizes ±3% accuracy of LED current along with excellent line and load regulation.

The multi-protection function of FT8350x can greatly enhance the system reliability and safety. The FT8350x features LED open/short circuit protection, CS resistor short circuit protection, over temperature compensation and VCC UVLO protection. The industry leading OVP voltage accuracy ensures the best LED open circuit protection.

Feature :

Built-in 700V power NPN 

PSR constant current control without secondary sense and feedback circuit 

Patents of demagnetization sensing and self power-supply technology

Ultra low operating current for high efficiency

Universal input voltage 

±3% LED current accuracy 

Programmable precision OVP voltage for best LED open circuit protection 

LED short circuit protection 

Patent of CS resistor short circuit protection 

VCC under-voltage protection 

Over temperature compensation 

Available in SOP8 and DIP8 packages 


More details
FT838R PSR 30W External MOS ±3% N/A Precision OVP, No Aux Winding

Product Profile :

The FT838D/FT838R controller device is optimized for high-performance, low power switching mode power supply applications. The FT838D/FT838R facilitates CC/CV charger design by eliminating an opto-coupler and TL431. Its highly integrated functions such as Under Voltage Lockout (UVLO), Leading Edge Blanking (LEB) and built-in cable compensation offer the users a high efficiency and low cost solution for AC/DC power applications.

Power supplies built with FT838D can achieve both highest average efficiency and fast dynamic load response. FT838R is optimized for LED driver applications with slightly higher (~22uA) standby current.

Furthermore, FT838D/FT838R features fruitful protections like Open Circuit Protection and Over Temperature Protection to eliminate the external protection circuits and provide reliable operations. FT838D/FT838R is avilabel in SOT23-5 package.


Feature :

Constant-Current (CC) and Constant-Voltage (CV) with Primary Side Control

Proprietary technology enabling high efficiency and fast dynamic response

No audible noise over entire operating range

Applications from 1W to more than 18W output

Direct drive of BJT or MOS switch 

Built-in Cable Compensation

Built-in Line Compensation

Primary-side feedback eliminates opto-coupler and TL431

Cycle-by-Cycle Current Limiting

Over Temperature Protection

VCC Over Voltage Protection

Open Circuit Protection


More details

datasheet

Part No. Version Update Supported Part Nos download
FT838xx 0.82 2018-06-04 FT838R、FT838NBx、FT838Dx
FT8350x 0.80 2018-06-04 FT8350A、FT8350C、FT8350CD、FT8350DD

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Part No. Version Update Supported Part Nos download
FT8350A 12S250mA 1.0 2018-06-04 FT8350A
FT8350C 12S300mA 1.0 2018-06-04 FT8350C
FT8350C 18S280mA 1.0 2018-06-04 FT8350C
FT8350DD 24W280mA 1.0 2018-06-04 FT8350DD

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Application Note

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