This article describes a 28 V applications for LED street lamps, LED off high power factor of 3.3 A driver design. This design is based on NCL30001 LED driver Semiconductor NCS1002 and constant voltage constant current controller, the 90 to 265 V AC power supply voltage, maximum output power of 90 W, has a high power factor, harmonic content while meeting the relevant standards, and able to cope with a pulse width modulation (PWM) dimming.
Single-stage topology LED driver + secondary side controller compositions CVCC
NCL30001 topology is a single-segment LED driver, which is well suited for flexible features new LED lighting products. The single segment integrated power factor correction (PFC) and isolated buck AC - DC (AC-DC) power converter off-line LED driver eliminates the need for dedicated PFC boost segment, the number of components can be reduced, reducing the cost of the program, LED power supply with improved overall system efficiency for LED street lights, low ceiling, wall lights, and architectural lighting applications.
NCL30001 continuous conduction mode (CCM) of work, and this program integrates PFC isolated DC-DC converter circuit, and provides a constant current to directly drive the LED. It corresponds to the AC-DC converter and LED driver circuit of two parts together, are located in the lighting fixture, the LED light bar is omitted linear or integrated DC-DC converter. Such power conversion section less monolithic program, use to reduce the number of components (e.g., optical element, LED, electronic components and printed circuit boards, etc.), reduce system cost, power and support higher overall energy efficiency of an LED. Of course, higher power density of this solution may not be suitable for all area lighting applications, it may be more appropriate optical pattern of a lower power LED, Typical applications include LED street lights, exterior lights, wall lamps and refrigerator cabinet lighting.
Other specifications Characteristics NCL30001 controller startup circuit further includes a high voltage, in order to improve the voltage feedforward loop response, input undervoltage detection, internal overload timer, latch input, a multiplier input line and accurately reduce harmonics. Semiconductor also provides isolated single stage PFC this LED driver evaluation board device for applying 40 W to 100 W power range requires direct constant current output. Current may be between 0.7 A to 1.5 A regulation, with a wider range of high-power high-brightness LED.
NCS1002 the secondary side is a constant voltage constant current (a CVCC) controller, and other areas suitable for LED street lighting applications, can be designed with NCL30001 controller further high efficacy, an LED driver demo board dimming function.
Based on 90 W and NCS1002 the demo board NCL30001
To assist design engineers to quickly implement lighting, ON Semiconductor provides 90 W CVCC demonstration board, which can receive 90 to 265 Vac extended universal input voltage (replacement under conditions supporting member 305 Vac), providing 1.5 to 0.7 A a constant current output range and constant output voltage range of 30 V to 55 V (which may be selected by a resistor divider), maximum output power of 90 W, 50 1,000 Hz are supported dimming control, and may be connected to an optional tone comprising 6 pin interface of the optical card, for adjusting the analog current application smart dimmer / digital dual brightness level dimming. In addition, this demo board also provides short circuit protection, open circuit protection, rich protection features over-temperature protection, over-current and over-voltage protection. Tests showed that this demo board at 50 W output power, 1,000 mA output voltage / 48 V forward drop energy efficiency conditions than 87%, at 50 to 100% load condition of the power factor higher than 0.9, while meeting IEC61000- class C devices 3-2 content standards harmonics.
Figure 1: a top view of a demonstration board, technology zone
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