10W non-isolated LED driver solution based on TI control chip

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

Industry control printed circuit boards (PCB)

1. For industrial control, special or general-purpose circuit board, the bottom circuit is completed, and IO is reserved. After buying the industrial control circuit board, the input and output ports reserved on the circuit board are connected to the user's own device, such as motor, solenoid valves, sensors, thus completing the function want to accomplish.
2. The special circuit board is a board specially designed for a certain function, such as the temperature control circuit board. After buying it, the input port is connected to the thermocouple, and the output port is connected with a heating contactor or a solid state relay to control the heating device to complete the temperature control. There are flow control boards, motion control boards, etc.
3. The universal control board, most of which can be programmed, after the user's own secondary development, completes a specific function, and has a wide range of uses. For example, plc is a general industrial control board. After the user writes the program and compiles the input, various functions can be completed. Digital input, analog input port, high-speed counter port, digital output port, analog output port, and some also have communication function.