This article introduces a 10W LED driver Power Supply designed by TI's control chip TPS92210. The TPS92210 has a unique critical mode fixed peak current control function, which requires no feedback, so the whole design is simple, the device is small, and the cost is low.
In recent years, in the LED driver power market, non-isolated solutions have become applications due to their smaller magnetic components, higher energy efficiency, fewer component counts, lower total bill of materials costs, and the ability to meet safety regulations with mechanical design. Hot spot. This article introduces a 10W LED driver power supply designed with the TI control chip TPS92210. Using the TPS92210's unique critical mode fixed peak current control function, the design does not require feedback, so the whole design is simple, the device is small, the cost is low, and the efficiency is high.
1. Introduction to power supply scheme
This scheme adopts the critical Buck circuit controlled by TPS92210, and sets the TPS92210 to work on the fixed peak current, so that the peak value of the inductor current is fixed. Because the circuit works in the critical mode, the average value of the inductor current is equal to half of the peak current, thus achieving the output constant current. the goal of.
At the same time, this solution does not require additional circuitry, and the TPS92210 itself can provide protection against overcurrent, short circuit, and open circuit. Therefore, the entire program has fewer components and lower costs.
The input uses a valley filling circuit, so that the PF value of the whole machine is always above 0.7.
C8, L2, and C5 form a pi-type filter. The whole machine passed the conduction test.
Figure 1: 10WLED Power Solution
Figure 2: 10WLED power supply physical map
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