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LM3492的基本参数
  • 制造厂商:TI
  • 产品类别:电源管理
  • 技术类目:LED 驱动器 - 照明 LED 驱动器
  • 功能描述:具有升压转换器和快速电流调节器的 2 通道独立可调光 LED 驱动器
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LM3492的产品详情:

The LM3492/-Q1 integrates a boost converter and a two-channel current regulator to implement a high efficient and cost effective LED driver for driving two individually dimmable LED strings with a maximum power of 15 W and an output voltage of up to 65 V. The boost converter employs a proprietary Projected-On-Time control method to give a fast transient response with no compensation required, and a nearly constant switching frequency programmable from 200 kHz to 1 MHz. The application circuit is stable with ceramic capacitors and produces no audible noise on dimming. The programmable peak current limit and soft-start features reduce current surges at start-up, and an integrated 190 mΩ, 3.9-A N-Channel MOSFET switch minimizes the solution size.

The fast slew rate current regulator allows high frequency and narrow pulse width dimming signals to achieve a very high contrast ratio of 1000:1 at a dimming frequency of more than 3 kHz. The LED current is programmable from 50 mA to 200 mA by a single resistor.

To maximize the efficiency, Dynamic Headroom Control (DHC) automatically adjusts the output voltage to a minimum. DHC also facilitates a single BOM for different number of LED in a string, which is required for backlight panels of different size, thereby reducing overall development time and cost. The LM3492/-Q1 comes with a versatile COMM pin which serves as a bidirectional I/O pin interfacing with an external MCU for the following functions: power-good, overtemperature, IOUT overvoltage and undervoltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of the LM3492/-Q1 include precise enable, VCC undervoltage lockout, current regulator over-power protection, and thermal shutdown protection. The LM3492/-Q1 is available in the thermally enhanced 20-pin HTSSOP package.

LM3492的优势和特性:
  • Boost Converter:
    • LM3492-Q1 is an Automotive Grade Product That is AEC Q100 Grade 1 Qualified
    • Very Wide Input Voltage Ranged From 4.5 V to 65 V
    • Programmable Soft Start
    • No Loop Compensation Required
    • Stable With Ceramic and Other Low ESR Capacitors With No Audible Noise
    • Nearly Constant Switching Frequency Programmable From 200 kHz to 1 MHz
  • Current Regulators:
    • Programmable LED Current from 50 mA to 200 mA
    • 1000:1 Contrast Ratio at a Dimming Frequency of More Than 3 kHz, Minimum LED Current Pulse Width is 300 ns
    • Two Individual Dimmable LED Strings up to 65 V, Total 15 W (Typically 28 LEDs at 150 mA)
    • Dynamic Headroom Control Maximizes Efficiency
    • Over-Power Protection
    • ±3% Current Accuracy
  • Supervisory Functions:
    • Precision Enable
    • COMM I/O Pin for Diagnostic and Commands
    • Thermal Shutdown Protection
    • Thermally Enhanced 20-Pin HTSSOP package
LM3492的参数(英文):
  • Input voltage (type)
  • DC/DC
  • Topology
  • Boost, Boost with Current Sink, Multi-Channel
  • Vin (Min) (V)
  • 4.5
  • Vin (Max) (V)
  • 65
  • Iout (Max) (A)
  • 0.2
  • Iq (Typ) (mA)
  • 3.6
  • Features
  • Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Power Good, Soft Start, Thermal Shutdown
  • Operating temperature range (C)
  • -40 to 125
  • Dimming method
  • PWM
LM3492具体的完整产品型号参数及价格(美元):

LM3492的完整型号有:LM3492MH/NOPB、LM3492MHX/NOPB,以下是这些产品的关键参数及官网采购报价:

LM3492MH/NOPB,工作温度:-40 to 125,封装:HTSSOP (PWP)-20,包装数量MPQ:73个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SN,TI官网LM3492MH/NOPB的批量USD价格:1.576(1000+)

LM3492MHX/NOPB,工作温度:-40 to 125,封装:HTSSOP (PWP)-20,包装数量MPQ:2500个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SN,TI官网LM3492MHX/NOPB的批量USD价格:1.313(1000+)

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LM3492的评估套件:

LM3492AR111DEMO — LM3492 AR111 LED 灯泡更换参考板

The LM3492 demonstration board included in this package is designed for converting nominal 12VAC from electronic transformer output to drive seven series connected LEDs at 360- mA average current. The end user can directly light up a LED string through the demonstration board from an electronic (...)

LM3492EVAL — 用于 LED 背景照明评估板的双通道降压稳压器(具有 DHC)

The LM3492 integrates a boost converter and a two-channel current regulator to implement a high efficient and cost effective LED driver for driving two individually dimmable LED strings with a maximum power of 15W and an output voltage of up to 65V. The boost converter employs a proprietary (...)

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