QH7935 Datasheet دیتاشیت PDF دانلود

دیتاشیت - DILIGENT - PSR Single-Stage APFC Offline LED Driver

شماره قطعه	QH7935
شرح مفصل	PSR Single-Stage APFC Offline LED Driver
تولید کننده	DILIGENT
آرم
1 Page No Preview Available ! QH7935 PSR Single-Stage APFC Offline LED Driver Description The QH7935 is a high precision primary-side regulation driver with single stage Active PFC, specially designed for universal input offline flyback or buck-boost constant current LED lighting. The driver with on-chip PFC circuit achieves high power factor and low THD. Operating in critical conduction mode, the power MOSFET switching loss is reduced and the inductor is fully utilized. The QH7935 adopts proprietary primary side current sensing scheme. It can precisely control the LED current without secondary side sense and feedback circuits. The device integrates a 650V power MOSFET to further reduce external components, for saving cost and PCB area. The ilizes patented line and load voltage compensation method to achieve excellent line and load regulation. The QH7935 offers rich protection functions to improve the system reliability, including LED open circuit protection, LED short circuit protection, VCC over voltage protection, VCC under voltage protection, CS resistor open protection and cycle by cycle current limit. All the protection functions are auto-recovery. The system reliability is further improved by the thermal regulation function. The output current is reduced when the driver is over temperature. Typical Application Features Single-Stage Active PFC for High Power Factor and Low THD Primary Side Control Constant Current Operation, No Opto-Coupler required Integrated 650V Power MOSFET ±3% LED Current Accuracy Excellent Line and Load Regulation Critical Conduction Mode Operation Ultra-Low (33uA) Startup Current High Resistance Feedback Resistor for Improved Efficiency LED Open and Short Circuit Protection CS Resistor Open Circuit Protection Cycle-by-Cycle Current Limit VCC Over-voltage and Under-voltage Protection Auto Fault Recovery Thermal Regulation Function Available in SOP-8 package Applications E27/ GU10 LED Bulb, Spot Light PAR30, PAR38 LED Lamp T8/T10 LED String Other LED Lighting AC NA NP NS QH7935 2 VCC DRAIN 5 3 FB DRAIN 6 1 COMP 4 CS GND 7 GND 8 DILIGENT Figure 1. Typical application circuit for QH7935 1
قانون اساسی	صفحه 9
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دیتاشیت توصیه

شماره قطعه	شرح مفصل	تولید کنندگان
QH7935	PSR Single-Stage APFC Offline LED Driver	DILIGENT
QH7938	Primary side feedback dimmable single-stage active PFC LED constant current control chip	ETC

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