5-40W built-in MOS LED constant current design with non-isolated single inductor

Probe domestic high current needle 150 head diameter 3.0 thread needle high current needle total

Single chip microcomputer STM32L151CCU6

1206RGB (single)

MOS power IC full range

Overview:
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-isolation schemes 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.
Chipown is the first in the industry to introduce a single-inductor non-isolated PN831X chip series with 5-40W full-power segment. 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.

PN831X Series Specifications

● PN8313 30V180mA/5.4W bulb lamp solution

Figure <1> PN8313 30V180mA bulb lamp schematic diagram Circuit diagram R1 and R3 are FB voltage divider resistors, the voltage can be sampled by the auxiliary winding, and the ratio of R1 and R3 can be adjusted to achieve the LED output open-loop voltage value, FB overvoltage The protection point is approximately 3V. No external high-voltage starting resistor is required, and the startup time is still less than 150ms under AC90V input.
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