FEATURES DESCRIPTION
Built-in 700V power NPN
PSR constant current control withoutsecondary sense and feedback circuit
Patents of demagnetization sensing and selfpower-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
FT8350x is a high precision primary-side feedbackand regulation constant current driver for LED
lighting applications. It operates in inductor currentdiscontinuous conduction mode (DCM) and is
especially suitable for flyback converter underuniversal input. Under universal input voltage from
85V to 265V, the system output power isrecommended from 3W to 24W respectively of
different internal power switch.
The FT8350x integrates a 700V power NPN andeliminates secondary sense and feedback circuit.
The loop compensation components are alsoremoved while maintaining stability over all
operating conditions. It uses a source drivearchitecture and patent demagnetization sensing
technology with very low operating current, Patentsof self power supply technology. the auxiliary
winding for sensing the output and supplying thechip is therefore eliminated, resulting in low
component counts and small system size.
With its highly accurate current sense method, theFT8350x 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.
FT8492GB-RB FT8492GB-RT FMD輝芒微 12V1A原裝正品電源驅動芯片
FT8900系列特點
這份應用資料介紹了 FT890xx 系列 PFC 非隔離
LED 驅動芯片及其應用電路。詳細描述了它的特
點和工作原理，并結合實際的應用方案介紹外圍
電路的設計流程。
應用范圍
E26/27 LED 燈
T5/T8 LED 燈
其他 LED 照明應用
全電壓輸入范圍內 PF>0.9
高轉換效率 >90%
輸出電流精度 <±3%
非常低的 BOM COST
線性調光(FT8902系列)
開關調光(FT8901系列, 輸入電壓范圍：
175~264Vac)
固定頻率控制
柵電壓鉗位：13.5V
逐周期的過流保護(OCP)
過壓保護(OVP)
欠壓鎖定(UVLO)
輸出短路保護
過溫保護(OTP)
LED 開
