概览
优势和特点
- Demonstrates Robustness of MAX25561 and MAX25560
- 7V (4.5V if LED Current per String Is Set to 150mA orLess) to 36V Input Operating Range (up to 42V LoadDump)
- Powers HB LEDs (up to Six Strings) for Medium-to-Large-Sized LCD Displays in Automotive and DisplayBacklight Applications
- 400kHz to 2.2MHz Resistor-Programmable SwitchingFrequency with Spread-Spectrum Option
- Phase-Shift Dimming Option
- Demonstrates Cycle-by-Cycle Current-Limit andThermal-Shutdown Features
- Demonstrates Wide Dimming Ratio
- Demonstrates Hybrid Dimming for Better EMI andAcoustic Performance and Higher Dimming Ratio
- Demonstrates Fade in/out for Smooth BrightnessTransition
- Designed to Show Thermal Foldback Function
- I2C Programmability
- Dedicated GUI
- Proven PCB and Thermal Design
- Fully Assembled and Tested
产品详情
The MAX25561 evaluation kit (EV kit) demonstrates the MAX25561 and MAX25560 integrated 6-channel high-brightness LED driver with boost controller and I2C interface for automotive displays supporting ASIL B (MAX25561 only).
The EV kit operates from a DC supply voltage between 7V (4.5V if the LED current per string is set to 150mA or less) and 36V, and the switching frequency can be either set at 2.2MHz or at 400kHz. The EV kit can only be configured to operate in I2C mode. Spread-spectrum mode (SSM) is enabled by default for EMI improvement, but it can be disabled by acting on a register bit. The EV kit demonstrates phase-shifted, pulse-width modulation (PWM) dimming. Dimming can be performed either externally using a PWM signal applied to the DIM PCB pad or internally by programming the desired dimming frequency and individual duty cycle through I2C. When the dimming signal is applied through the DIM PCB pad, readback of measured dimming duty cycle and frequency will be made available on dedicated I2C registers.
The hybrid dimming feature can also be enabled through a register bit to reduce EMI.
The EV kit features a LED current foldback option as a function of the temperature by means of an on-board NTC sensor. I2C-programmable automatic fading functionality is also available.
Finally, the EV kit demonstrates short-LED, open-LED, boost output undervoltage and overvoltage, boost input overcurrent, LED current/duty cycle mismatch, and overtemperature-fault protection. Additional ASIL B features like LED current measurement, boost input current measurement, and boost output voltage measurement are also demonstrated.
For operation at switching frequencies other than 2.2MHz or 400kHz, the external components should be chosen according to the calculations in the MAX25561 IC and MAX25560 IC data sheets.
The EV kit provides an I2C interface that can operate in conjunction with the MAX32625PICO adapter or a third-party I2C controller. Windows®-based graphical-user interface (GUI) software is available for use with the EV kit and can be downloaded on the MAX25561 and MAX25560 product pages (under the Evaluation Kits tab). A Windows 7 or newer Windows operating system is required to use the EV kit software.
文档
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MAX25561EVKIT Gerber Files2024/1/9ZIP1 M