For high-power built-in/external lamp power supplies above 25W, due to high power factor and THD requirements, and the output current is relatively large, the current solution is usually a two-stage rack (APFC+DC/DC). Mainly.
The traditional two-stage solution, because it requires two chips to be controlled separately, is often difficult to optimize in terms of chip power supply, drive efficiency and volume, BOM quantity and cost.
As a solution for Jingfeng Mingyuan in high-power high-end lamp driving power supply, UR3311 is a two-in-one control chip based on two-stage architecture, which can be applied to BOOST+FLYBACK isolation application or BOOST+BUCK. Non-isolated applications. Suitable for lamp power supplies with high power factor, low THD, low output current ripple requirements.
UR3311 chip features
1, patented smart chip power supply
The patented smart chip power supply and critical current valley detection technology without auxiliary winding UR3311 is the simplest and lowest cost design for transformer and inductor design in the current two-stage solution. The power inductor of the front stage BOOST is a single winding inductor, the rear stage isolation FLYBACK is a double winding transformer, and the rear stage non-isolated BUCK is a single winding inductor.
2. The simpler BOOST inductor design keeps the full voltage to maintain high efficiency. When the BOOST level is the low-voltage input, the clamped BOOST output voltage is 280V. When the input voltage rises, the BOOST output voltage is follow-type, which realizes a simpler BOOST inductor design and maintains full voltage to maintain high efficiency.
3, the best conversion efficiency critical current mode (BCM) + valley quasi-resonant working mode
Both stages are critical current mode (BCM) + valley quasi-resonant mode of operation for optimum conversion efficiency. High-precision constant current algorithm and perfect protection.
UR3311 feature advantages
UR3311 full voltage range PF>0.95, THD<10%;
Output current ripple is less than ±5%, no stroboscopic; up to 88% efficiency (isolation);
<500ms quick start;
Excellent linearity and load regulation, good consistency;
Patented algorithms that greatly reduce the number of peripheral devices;
Support for isolated and non-isolated applications;
Built-in comprehensive protection features;
typical application
UR3311 Full Voltage Input High PF Low Frequency Flash External Power Supply Application
Input voltage: 90~270Vac
Output LED: 36V/1A
PF>0.95 THD<15%
1, PCB physical map
2, schematic
3, PF, DHT and efficiency graph
UR3311 You can select the BOOST+FLYBACK and BOOST+BUCK topologies as needed. You only need to change the connection of the MODE pin to select different application topologies. In general, external power supplies for panel lights or other applications should use the BOOST+FLYBACK topology. This topology has the advantages of high security level and good consistency. BOOST+BUCK topology can be used for high efficiency, high efficiency built-in or second-class lighting applications. This topology has the advantages of high efficiency and low application cost.
Our wire harnesses are widely used for various parts of automobiles and truck , Like engine valve cover gasket/diesel gasket(DORMAN-FORD), headlamp(GROTE), Intelligent Anti-collision System(Mobileye), audio, rearview mirror, power seat, etc. Also the complete engine cable assembies for electric vehicle.
Related Products:ul wiring assembly,engine gasket cable,cable harness.
Automotive Wire Harness,Auto cable assemblies,OEM Automotive Wire Harness,Electrical Automotive Wire Harness,Wire Harness,Auto Wiring Harness,Engine Wiring Harness,Cable Harness,Ul Wiring Assembly
ETOP WIREHARNESS LIMITED , http://www.wireharness-assembling.com