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Chipown is the first in the industry to introduce a 1-41W full-power segment of the single-inductor non-isolated PN831X chip family. It is used in the ultra-simplified peripheral driver scheme of the Buck architecture. It features few external components, built-in high-voltage switching MOS and startup. MOS, integrated self-powered technology, complete protection function (open circuit protection through external FB resistor setting, more accurate), high output current accuracy (±3%), line voltage adjustment can be set by external resistors, can be matched with valley filling circuit. 
PN8313 30V180mA/5.4W bulb lamp solution
In the circuit diagram, R1 and R3 are FB voltage dividing resistors. The voltage sampled by the auxiliary winding can be adjusted by proportionally adjusting R1 and R3 to realize the LED output open-loop voltage value. The FB over-voltage protection point is about 3V. No external high-voltage starting resistor is required, and the startup time is still less than 150ms under AC90V input.
Program features:
1) Single panel design, double-sided components, area: 32mm*26mm;
2) The full voltage range output is 5.4W, which can pass CE;
3) With accurate output open circuit (less than 50V), short circuit, over temperature protection, CS resistance open short circuit protection;
4) Output efficiency: ≥91% (115V, 230V full load); current accuracy ±3%.
It can be seen from the above table that the current accuracy of this scheme is ±1.0% at full voltage input in the load range of 20V-35V, and the performance is quite outstanding.
PN8315 110V120mA/13.2W LED Driver Solution
1) Double panel design, double-sided components, area: 13mm*24mm;
2) 176V~264V voltage range output 15W, can pass CE;
3) With accurate output open circuit (less than 200V), short circuit, over temperature protection, CS resistance open short circuit protection;
4) Output efficiency: ≥92% (176V~264V full load); current accuracy ±3% (200~264V);
5) BOM: 16 can be used at a low cost.
As we all know, for a size of only 13mm * 24mm, a one-dollar size, temperature rise is the most critical in the application process, and when the 176V input full load 80 ° C ring temperature test, PN8315 is a full lower than the competitor IC surface temperature of 11.4 ° C Many! For LED lamps in high temperature environments, low temperature rise is equivalent to high reliability.
Program features:
1) Single panel design, single-sided components, area: 55mm*32mm;
2) 176V~264V voltage range output 22.4W;
3) With accurate output open circuit (less than 150V), short circuit, over temperature protection, CS resistance open short circuit protection;
4) Output efficiency: ≥93% (176V~264V full load); current accuracy ±3% (176~264V);
5) BOM: 18, low cost, full plug-in, easy to generate.
The failure of the LED switch constant current source under the repeated switching machine is often because the starting moment is one of the biggest moments for the chip to withstand the impact of the electrical stress. If no reasonable measures are taken, the IC breakdown failure is easy to occur. The PN831X series ICs use dual-mode switching start-up technology. When the power is turned on, the system can establish energy in 10ms with ultra-low fixed frequency, then switch to quasi-resonant frequency modulation mode, and gradually release the PWM frequency until load balancing, so it starts at an instant. In the case of abnormal short-circuit restart, energy overshoot can be avoided to greatly reduce the switching stress, and the 200ms quick start can be guaranteed. The following figure shows the waveform of the PN8316 being turned on instantaneously under the AC264V input condition. The yellow CH1 is the Drain waveform, and the green CH2 is the VDD waveform. It can be seen that the highest peak of the power MOS transistor at the AC264V startup instant is only 388V, which is the typical withstand voltage of the chip MOS. 70%. The peak of VDD is only 17.3V, which is 42% of the typical withstand voltage of the VDD power supply terminal of the chip. The margin is sufficient and the operation is safer.
The PN831X series does not have an APFC function. If necessary, the valley fill circuit can be added. The PF value is greater than 0.8. The core microelectronics can also provide an isolated/non-isolated full range of APFC chips for selection.
PN8317 170V240mA/41W LED Driver Solution
For the indoor lighting market, the 24~40W fluorescent lamp/ceiling lamp solution is urgently needed. The PN8317 can change the CS detection resistor R1 (2.2R) and the FB resistance detection resistor R3 (33K) by increasing the input electrolytic capacitor C1 (400V15uF) on the PN8316 solution. The output capacitor C3 (250V4.7uF) and the Buck inductor T1 (EE-16) can be designed as an external drive solution of 170V240mA 41W.
Of course, the reason why the CS detection resistor needs to be modified is because the output current of the PN831X series is determined by Io=0.5x0.5/Rcs, and Vovp=3.3x (FB pull-up resistor/pull-down resistor +1) requires FB. The pull-up/pull-down resistor ratio is increased. Moreover, the modified PN8317 170V240mA 41W AC176V ~ 264V input full load efficiency has been as high as 95%.
At present, 24~40W high-power segments such as flat lamps and ceiling lamps have higher requirements for the on-resistance of the built-in MOS, and the first PN8317 high-power 41W single-inductor solution introduced by the core in the industry is the best choice.
In summary, this paper analyzes the non-isolated single-inductor LED constant current source scheme using PN831X series chips, and analyzes the respective characteristics, basic working mechanism, main parameter performance and various protection modes of the 1-41W five schemes. At the same time, it introduces the technical difference characteristics of PN831X series chips and competitive products in the market, especially the protection function is more complete, the power segment coverage is more comprehensive, and the peripheral components are less.
As indoor small and medium power LEDs gradually adopt materials with good insulation properties such as plastic coated aluminum and high thermal conductive plastics in the structure of the lamp body, the application of the non-isolated built-in power MOS architecture on the power supply drive will occupy the mainstream. The PN831X series of single-inductor non-isolated LED constant current sources are ideal for applications such as bulbs, downlights, ceiling lamps, and fluorescent lamps.
1-41W non-isolated single inductor ultra-simplified peripheral LED constant current drive scheme
LED lighting drive power efficiency is one of the bottlenecks that limit the improvement of light efficiency and the cost of the heat sink of the whole lamp. The non-isolated drive architecture is compared with the flyback isolation drive architecture. It has high efficiency (more than 90%), high output voltage and low BOM. The advantage of low cost. Especially in the recent development of plastic-coated aluminum, heat-conducting plastic and other insulating structural materials, non-isolated solutions such as filament lamps, bulb lamps, PAR lamps, fluorescent lamps, etc., are gradually occupying the mainstream, and more will be cut into panel lamps in the future. , 24W-40W power segment applications such as ceiling lamps.