One, 1 W to 8 W solution
Low-power LED general lighting applications from 1 W to 8 W include G13, GU10, PAR16, PAR20, and downlights. This type of application has an input voltage range of 90 to 264 VAC and a constant current output current of 350 mA and 700 mA. The energy efficiency requirement is 80%. Short-circuit and overvoltage protection are also required. This type of application can use ON Semiconductor's NCP1015 self-powered monolithic switch control IC. The device integrates a fixed frequency (65/100/130 kHz) current mode controller and a 700 V high voltage MOSFET with all the features needed to build a robust, low cost power supply such as soft start, frequency jitter, short circuit protection, and skip cycle , maximum peak current set point and dynamic self-powered function (no auxiliary winding required).
The NCP1015 can be used for both isolated and non-isolated solutions, as shown in Figure 1.
Figure 1 1 W to 8 W isolated (a) and non-isolated (b) LED lighting solutions based on NCP1015
It is worth mentioning that an important feature of the new version of the "Energy Star" solid-state lighting standard is that the power factor of a variety of residential lighting products is required to be as low as 0.7. This type of LED lighting application typically has a power range of 1 W to 12 W, making it ideal for isolated flyback power supply topologies. However, the power factor of existing standard design techniques is typically less than 0.6. To improve power factor and easily meet ENERGY STAR requirements, the optimized NCP1014LEDGTGEVB evaluation board can be combined with ON Semiconductor's off-line 8 W LED driver reference design.
ON Semiconductor's NCP1014LEDGTGEVB evaluation board can drive from 1 to 8 high-power, high-brightness LEDs. The design is based on the NCP1014, a compact fixed-frequency pulse-width modulation (PWM) converter that integrates a high-voltage power switch with internal current limiting. Since the NCP1014 operates at a fixed frequency, the current cannot rise above a certain point; the on-time limit allows the input current to follow the waveform of the input voltage, providing a higher power factor. The evaluation board circuit diagram is shown in Figure 2.
Figure 2 NCP1014LEDGTGEVB circuit diagram
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