LM3492 - 具有升压转换器和快速电流稳压器的双通道可单独调光 LED 驱动器

LM3492是TI德州仪器公司的一款LED照明-照明产品，LM3492是具有升压转换器和快速电流稳压器的双通道可单独调光 LED 驱动器，本站介绍了LM3492的封装应用图解、特点和优点、功能等，并给出了与LM3492相关的TI元器件型号供参考。

LM3492 - 具有升压转换器和快速电流稳压器的双通道可单独调光 LED 驱动器 - LED照明-照明 - LED驱动器 - 德州仪器

产品描述

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 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 startup, and an integrated 190 m?, 3.9A 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 comes with a versatile COMM pin which serves as a bi-directional I/O pin interfacing with an external MCU for the following functions: power-good, over-temperature, IOUT over- and under-voltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of the LM3492 include precise enable, VCC under-voltage lock-out, current regulator over-power protection, and thermal shutdown protection. The LM3492 is available in the thermally enhanced 20-pin HTSSOP package.

产品特性

Boost Converter:
- LM3492Q is an Automotive Grade Product that is AEC Q100 Grade 1 Qualified
- Very Wide Input Voltage Ranged from 4.5V-65V
- 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 65V, total 15W (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

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