Analog Devices MAX25561 Manual

Evaluates: MAX25561, MAX25560
General Description
The MAX25561 evaluation kit (EV kit) demonstrates the
MAX25561 and MAX25560 integrated 6-channel high-
brightness LED drivers with boost controller and I
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
2
to operate in I C 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,
(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 I
dimming signal is applied through the DIM PCB pad,
readback of measured dimming duty cycle and frequency
will be made available on dedicated I
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
2
sensor. I C-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,
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 I
conjunction with the MAX32625PICO adapter or a third-
2
party I C controller. Windows
interface (GUI) software is available for use with the EV kit
and can be downloaded on the
product pages (under the Evaluation Kits tab). A Windows
7 or newer Windows operating system is required to use
the EV kit software.
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pulse-width modulation
2
C. When the
2
C registers.
and boost output
2
C interface that can operate in
® -based graphical-user
MAX25561 and MAX25560
Features and Benefits
•
Demonstrates
MAX25560
•
7V (4.5V if LED Current per String Is Set to 150mA or
2
C
Less) to 36V Input Operating Range (up to 42V Load
Dump)
•
Powers HB LEDs (up to Six Strings) for Medium-to-
Large-Sized LCD Displays in Automotive and Display
Backlight Applications
•
400kHz to 2.2MHz Resistor-Programmable Switching
Frequency with Spread-Spectrum Option
•
Phase-Shift Dimming Option
•
Demonstrates
Thermal-Shutdown Features
•
Demonstrates Wide Dimming Ratio
•
Demonstrates Hybrid Dimming for Better EMI and
Acoustic Performance and Higher Dimming Ratio
•
Demonstrates Fade in/out for Smooth Brightness
Transition
•
Designed to Show Thermal Foldback Function
• 2
I C Programmability
•
Dedicated GUI
•
Proven PCB and Thermal Design
•
Fully Assembled and Tested
MAX25561 EV Kit Files
MAX25561SetupV1_0_0000.exe
voltage
Ordering Information
Windows is a registered trademark of Microsoft Corporation.
MAX25561 Evaluation Kit
Robustness of
Cycle-by-Cycle Current-Limit
FILE DESCRIPTION
Installs EV kit files onto
computer
appears at end of data sheet.
319-101042; Rev 1; 2/24
MAX25561 and
and