MAX25561

推荐新设计使用

6 x 220mA, ASIL B LED Backlight Driver with Boost Controller

数据手册 (Rev. 1) 产品选型表
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产品技术资料帮助

ADI公司所提供的资料均视为准确、可靠。但本公司不为用户在应用过程中侵犯任何专利权或第三方权利承担任何责任。技术指标的修改不再另行通知。本公司既没有含蓄的允许，也不允许借用ADI公司的专利或专利权的名义。本文出现的商标和注册商标所有权分别属于相应的公司。
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产品详情

  • Operates down to 3V on Battery Input while Maintaining 5V Gate Drive
    • Wide Boost Duty-Cycle Range
  • Boost or SEPIC Current-Mode DC-DC Controller
    • 400kHz to 2.2MHz Operating Frequency Range
    • Optional Spread Spectrum
    • Can Be Synchronized to an External Clock
  • LED Current Sinks
    • Up to 220mA Output Current per String
    • Low OUT_ Regulation Voltage
    • Optional Phase-Shifting Between Channels
  • 16667:1 Dimming Ratio at 200Hz
  • External or Internal (I2C) Dimming
  • >16667:1 Dimming Ratio with Hybrid Dimming
  • Integrated Charge-Pump to Drive Series nMOSFET
  • Temperature Foldback Using External NTCTemperature Sensor
  • Fast Startup Option without I2C Intervention UsingEN Pin Only
  • FLTB Output Provides Diagnostic Information
    • Shorted or Open LEDs
    • Any OUT_ Pin Shorted to GND
    • IREF/RT Resistor Out of Range
    • Thermal Warning/Shutdown
    • Undervoltage/Overvoltage on Boost Output
    • Bandgap out-of-Range/Internal Oscillator Failure
    • V18 Internal Supply out-of-Range
    • Input Overcurrent (Measured at Boost InputUsing External Sense Resistor)
    • Input/Output PWM Comparison
    • Continuous Output Current Measurement andCurrent Mismatch (Shutdown/Flag)
  • I2C Interface with CRC
    • Readback of Measured DIM Pin Duty Cycle andFrequency
  • Compact TQFN Package
MAX25561
6 x 220mA, ASIL B LED Backlight Driver with Boost Controller
MAX25561 Simplified Block Diagram MAX25561 Pin Configuration
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参考资料

数据手册 1

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工具及仿真模型

SIMPLIS Models 1

评估套件

eval board
schematic 1
schematic 2
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MAX25561EVKIT

Evaluation Kit for MA25560 and MAX25561

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特性和优点

  • 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.
MAX25561EVKIT
Evaluation Kit for MA25560 and MAX25561
MAX25561EVKIT Board Photo Angle View MAX25561EVKIT Board Photo Top View MAX25561EVKIT Board Photo Bottom View

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