Recently, Xiao Bian saw a post on the topic of LED driver chip in a forum. He talked about the current development of LED driver IC and the trend of future market development, and shared some opinions or opinions.
LED driver ICs are currently showing a prosperous scene in the market, which is mainly due to the rapid growth of the LED lighting industry, which has created a lot of domestic small IC design houses, and expects to get a piece of the big industry.
Domestic small IC Design House, currently divided by region, Jiangsu (Zhejiang and Zhejiang) (or the Yangtze River Delta) is the most (at least 20), I know more than 10; South China Pearl River Delta region is relatively lagging behind, but very close Market front-end; of course, LED lighting manufacturers in the Yangtze River Delta region also account for one-fifth of the total production of LED lighting in China (except Xiamen); LED lighting manufacturers in the Pearl River Delta region account for about three points of the entire Chinese production One; is the largest production area in the country. However, the LED driver IC Design House is less awkward, especially in the first two years. As far as the Shenzhen region is concerned, there are fewer than five (more than 20 people). When it comes to the development of LED driver chips, in fact, the traditional switching power supply PWM IC is used early, and more than 60W are used. PFC, plus secondary constant voltage constant current IC, such as ST L6561/6562A/C.
There are currently three major categories of LED driver power supplies :
1. RCC (Resistor-Capacitor Coupled) RC coupling: ultra low-end bulb products of less than 5W
2. Linear Driving IC Linear Drive IC Solution
a). Constant Current Diode
b). Linear non-PFC IC
c). Linear High PFC IC
At present, the above linear ICs are hardly sold in the market, and a small number of low-end bulbs are still in use. The T8-T5 is almost useless.
What are the specific reasons, everyone understands, I will not say more!
3. Switching power supply IC solution
a). Isolated (PF or not)
a)). PSR with PFC <80W
b)). SSR with PFC <150W
b). Non-isolated (PF or not)
Less than 40W.
The isolated schemes are PSR and SSR. The PSR solution also follows the previous charger solution, except that the CV module is removed, and the chip area is small; only the constant current function is retained. The PSR structure is easy for newcomers to the power supply; there is no need to worry about loop stability (no need to debug loops at all).
Later, a LED driver chip Design House referred to PI's TNY series (charger solution) dual winding solution, using Cascaded MOS architecture, eliminating the auxiliary winding and VCC peripheral rectifier components. In the early days, PI's double windings could only be used on adapters or chargers below 5W with low CV requirements; since CV accuracy is poor, it is not commonly used. Design House, a LED driver chip, led the mainstream of low-power dual-winding LED driver solutions with this architectural innovation.
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