For the dazzling LED display, the driver IC is more like a silent "behind the scenes", it shoulders the important mission of high efficiency, high stability, high precision and long life. It is also this "behind the scenes" that directly determines the experience of the LED display. As the number one player in the LED display driver market, JiChuang North is constantly exploring the road to the development of the industry and the advancement of technology in order to promote the product's ultimate cost performance. Recently, JiChuang North introduced the latest 16-channel dual-buffer constant current output LED driver chip ICN2028, which effectively improved the display refresh rate and further improved the performance. This article refers to the address: http:// What is the difference between ICN2028? The ICN2028 is a driver IC designed for LED displays. It uses 16 channels of constant current sink current output. It integrates “Noise FreeTM†technology and has excellent anti-interference characteristics, making constant current and low gray effect free from PCB. The influence of the board. Different external resistors can be used to adjust the current level of the output stage to accurately control the brightness of the LED. Figure 1: Block diagram of ICN2028. The ICN2028 uses precise current drive control technology. The current difference between different chips is very small between different channels of the same chip. 1) The current difference between channels is <±1.3%, and the current difference between chips is <±2.5%. 2) Current output characteristics that are not affected by the voltage at the load terminal, as shown in Figure 2. The output current will not change as the LED forward voltage VF changes. Figure 2: ICN2028 current output characteristics. ICN2028 will buffer 16bit display data during display (OE=0), so the system can continue to store 16bit serial data during the display of ICN2028. Compared with the universal constant current source chip, the refresh rate can be increased by more than 50%. The ICN2028 uses internal current precision control technology to achieve an inter-chip error of less than ±2.5% and an inter-channel error of less than ±1.3%. The performance comparison between ICN2028 and the previous generation ICN2025/26 is shown in the table below. Table 1: Performance comparison of constant current drive ICN2025/26/28. The ICN2028 adds a double latch to the original ICN2025, which makes better use of data transmission and display time, effectively improving the display refresh rate. Of course, the ICN2028 can also be used as a normal constant current driver without using the double latch function. ICN2028 adopts low voltage process and built-in voltage clamp protection circuit, which can effectively reduce the reverse voltage of the lamp bead during display, thus achieving the function of protecting the lamp bead and prolonging the service life of the lamp bead. How does ICN2028 improve the display refresh rate? The general constant current chip in the data transmission and data display as shown in Figure 3, the reasons for the low utilization of data transmission and data display: 1. When displaying a high-order data, the data display time may be much larger than the data transfer time, and data transfer is not possible during the data display redundant time. 2. When a low-level data is displayed, the data display time may be much smaller than the data transfer time, and data display cannot be performed for an extra time during data transfer. Figure 3: General-current constant current source driver chip data transfer and data display timing diagram. ICN2028 data transmission and data display timing is shown in Figure 4. Data (A) and data (C) are high-order data, data (B) and data (D) high and low data. The high and low data of the display data are combined according to time, so that the extra time of displaying the high data can be utilized for data transmission, or the time of transmitting the data is used for high-level display, and the data and the display data are perfectly matched, which can effectively To improve the display refresh rate, the basic steps are as follows: 1. When the data (A) transfer is completed, a latch signal is generated on the LE, and the data (A) is latched. 2. After the data(A) latch is completed, register data(A) and display data(A)OE from 1~>0. 3. Transfer data(B) while displaying data(A) 4. After the data (B) transfer is completed, the latch signal is generated by the LE, the data (B) is latched, and then the data (C) is transmitted. 5. After the display of data(A) is completed, register data(B) and display data(B). 6. Complete the transfer of data(C) and complete the display of data(B). 7. Register data(C) and transfer data(D), (same step 1) Figure 4: ICN2028 data transfer and data display timing diagram. Key features of ICN2028 Ø 16-channel constant current sinking current output Ø Output current setting range: 0.5～45mA@VDD=5V 0.5~25mA@VDD=3.3V Ø Current accuracy Between channels: ±0.7% (typical) ±1.3% (maximum) Between chips: ±1.1% (typical) ± 2.5% (maximum) Ø Fast output current response (minimum): 60ns@VDD=5VOE Ø I/O Schmitt trigger trigger input Ø Maximum data transmission frequency: 30MHz Ø Chip working voltage: VDD=3.3~6V Ø Operating temperature range: -40 ° C ~ 85 ° C Ø Excellent anti-interference ability and low gray scale effect Ø Integrated dual buffer, the refresh rate is more than 50% higher than the general-purpose constant current chip Ø Integrated bidirectional clamp protection circuit in the channel can effectively reduce the damage of the lamp bead 360 Laptop
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