Do you know what is ENEPIG in PCB?
7.Process costs substantially lower than electrolytic nickel gold or electroless nickel electroless gold
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BF1030 switch dimming LED power supply physical map
BF1030 is a high-precision step-down switching dimming LED constant current control chip with source power factor correction. It is suitable for non-isolated buck constant current power supply with full range input voltage of 85VAC-265VAC, with built-in active power factor correction. The circuit has a power factor of up to 0.99 and a total harmonic distortion of less than 10%.
BF1030 built-in light dimming function, you only need to continuously press the home wall switch (no need for a dedicated dimmer), you can change the brightness of the LED light: the first time you turn on the switch, the brightness of the LED light is 100%; turn the switch on again after turning off the light The brightness becomes 40%; the above action is repeated again, the brightness becomes 8%; if the above action is repeated again, the brightness is changed back to 100%; the user can select an appropriate gear according to the actual demand for the illumination brightness. 
Actual effect diagram of lamps with switch dimming function
The BYD switch dimming scheme is simple in operation, convenient in dimming, requires no dedicated dimmer, and realizes the change of LED light brightness without changing the lighting line; the scheme has small volume, wide compatible power range, high power factor and cost. Ultra-low characteristics, realizing zero cost dimming in the true sense;
BYD switch dimming chip has been widely used in LED ceiling lamps, panel lamps, LED tubes, bulbs and other lighting fields. It has been successfully introduced into many domestic LED lighting industry leaders such as NVC, Foshan Lighting, Midea and Otlan. And stable mass production, BYD switch dimming chip is your first choice for intelligent lighting, green lighting, energy-saving lighting. (This article is a BYD microelectronics submission) 
What is ENEPIG?ENEPIG-Electroless Nickel Electroless Palladium Immersion Gold is a surface finish for Printed Circuit Boards.ENEPIG works well with lead free and conventional eutectic solder alloys.This is the best way for gold wire bonding. Advantages for ENEPIG:
1.[Black Nickel" free – no possibility of grain boundary corrosion of nickel surface by immersion gold
2.Palladium acts as an additional barrier layer to further reduce copper diffusion to surface, thus ensuring good solderability
3.Palladium completely dissolves into solder, without leaving an excessively high P% rich interface, exposing an oxide-free nickel surface allowing reliable formation of Ni/Sn intermetallic
5.Withstands multiple lead-free reflow soldering cycles
6.Demonstrates excellent gold wire bondability
Zero cost dimming - non-isolated switch dimming LED driver chip
BYD Microelectronics, a leading manufacturer of LED switch dimming driver chips, has introduced a new non-isolated high-PF LED driver chip that supports switching dimming function--BF1030. This product is very suitable for various LED lamps, bulbs and other lighting fixtures. No need to increase costs, no need for line modification, easy to have 2-3 section dimming function.