LM3492HC - 具有升压转换器和快速稳流器的双通道独立可调 LED 驱动器

LM3492HC是TI德州仪器公司的一款LED照明-照明产品，LM3492HC是具有升压转换器和快速稳流器的双通道独立可调 LED 驱动器，本站介绍了LM3492HC的封装应用图解、特点和优点、功能等，并给出了与LM3492HC相关的TI元器件型号供参考。

LM3492HC - 具有升压转换器和快速稳流器的双通道独立可调 LED 驱动器 - LED照明-照明 - LED驱动器 - 德州仪器

产品特性

Boost Converter
- Automotive Grade Product, Q100 Grade-1 Qualified
- Very Wide Input Voltage Range: 4.5 V to 65 V
- Programmable Soft-Start Period
- 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 Regulator
- Programmable LED Current: 50 mA to 250 mA
- 10000:1 Contrast Ratio, 300-ns Minimum Pulse Width
- Two Individual Dimmable LED Strings up to 65V, Total 15 W (Typically 28 LEDs at 150mA)
- 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 PWP, 20-Pin Package

产品应用

Ultra-High Contrast Ratio 6.5” to 10” LCD Display Backlight up to 28 LEDs
Automotive or Marine GPS Display

产品说明

The LM3492HC/-Q1 device integrates a boost converter and a two-channel current regulator to implement a highly efficient and cost effective LED driver. This device drives 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. The nearly constant switching frequency can be set to a level from 200 kHz to 1 MHz. Ceramic capacitors stabilize the application circuit and produce no audible noise on dimming. The programmable peak current limit and soft-start features reduce current surges at start-up. 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 10000:1. The LED current can be set from 50 mA to 250 mA by a single resistor.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
LM3492HC	PWP (20)	6.50 mm × 4.40 mm
LM3492HC-Q1	PWP (20)	6.50 mm × 4.40 mm

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