Analog Devices / Maxim Integrated MAX25014EVKIT Evaluation Kit

Analog Devices MAX25014EVKIT Evaluation Kit is a demonstration platform for the MAX25014 Automotive 4-Channel Backlight Driver. The MAX25014EVKIT 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 via I²C. The hybrid dimming feature can also be enabled through a register bit to reduce EMI. The Evaluation Kit also demonstrates short-LED, open-LED, boost output undervoltage, overvoltage, and overtemperature-fault protection. LED current measurement and boost output voltage measurement are also demonstrated.

The MAX25014EVKIT operates from a DC supply voltage between 2.5V and 36.0V and the switching frequency can be either set at 2.2MHz or at 400kHz. The Evaluation 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.

Features

Demonstrates the capabilities of the MAX25014
Wide 2.5V to 36V input operating range (up to 40V load dump)
Powers HB LEDs (up to four strings) for medium-to-large-sized LCD displays in automotive and display backlight applications
400kHz to 2.2MHz resistor-programmable switching frequency with a spread-spectrum option
Phase-shift dimming option
Demonstrates cycle-by-cycle current limit and thermal-shutdown features

Demonstrates a wide dimming ratio
Demonstrates failsafe operation
I²C programmability
Dedicated GUI
Proven PCB and thermal design
Fully assembled and tested

Required Equipment

5V to 36V, 16A DC power supply
Two digital voltmeters (DVMs)
Four series-connected HB LED strings (9 LEDs each) rated to no less than 150mA

Current probe to measure the HB LED current
MINIQUSB+ interface board with USB cable
Windows-compatible PC with a available USB port

Analog Devices / Maxim Integrated MAX25014EVKIT Evaluation Kit

Features

Required Equipment

Board Layout

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