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MAX16825EVKIT 데이터시트(PDF) 5 Page - Maxim Integrated Products |
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MAX16825EVKIT 데이터시트(HTML) 5 Page - Maxim Integrated Products |
5 / 10 page MAX16825 Evaluation Kit _______________________________________________________________________________________ 5 Detailed Description of Hardware The MAX16825 EV kit demonstrates a high-voltage, 3- channel, linear high-brightness LED driver using the MAX16825 IC in a 16-pin TSSOP surface-mount pack- age. This EV kit is configured to supply an LED current of 100mA per channel. The MAX16825 IC controls the LED current by maintaining a 200mV drop across each external sense resistor (R8, R9, and R10). The EV kit operates from a 0.5A, 6.5V to 28V rated power supply. The MAX16825 EV kit uses a standard 4-wire SPI inter- face for independently controlling each of the three individual channels. Only the components in the Figure 3 schematic are required when using a user-supplied SPI interface. The MAX16825 integrates a USB-to-SPI interface circuit that is based on Maxim’s MAXQ2000 16-bit microcontroller. The EV kit includes Windows 2000/XP/Vista-compatible software that provides a GUI for exercising the MAX16825 features. The components on the Figure 4 schematic are only required for PC evaluation and are not needed for an HB LED design. The MAX16825 features an exposed paddle that uses the top-layer and bottom-layer PCB copper as a heatsink. The exposed paddle connects to GND. LED Load Configuration The MAX16825 EV kit can drive three separate LED loads. Each LED load can consist of multiple LEDs con- nected in series. The LED load’s forward voltage can be up to 26.3V. The EV kit drives LEDs rated for at least 100mA. Proper heat sinking of the LEDs is important for optimum LED performance and durability. Output Current Setting The current for each MAX16825 EV kit LED channel (ILED1, ILED2, and ILED3) is configured to 100mA by three sense resistors (R8, R9, and R10, respectively). See the equation below to select a different LED current and a new resistor value. If designing for a higher LED current, verify that the desired current setting does not exceed the power rating of the corresponding resistor (R8, R9, R10) or the LED load. Do not set the LED cur- rent above 150mA. Use the following equation to cal- culate the value of the new resistor: where ILED_ is the desired LED current and R_ is the resistor value required to set the desired current of the LED channel. R mV ILED _ _ = 200 |
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