LM3519 - 具有高速 PWM 亮度控制的高频升压白光 LED 驱动器

LM3519是TI德州仪器公司的一款背光产品，LM3519是具有高速 PWM 亮度控制的高频升压白光 LED 驱动器，本站介绍了LM3519的封装应用图解、特点和优点、功能等，并给出了与LM3519相关的TI元器件型号供参考。

LM3519 - 具有高速 PWM 亮度控制的高频升压白光 LED 驱动器 - 背光 - LED驱动器 - 德州仪器

产品描述

The LM3519 drives up to 4 white LEDs with constant current to provide LCD backlighting in handheld devices. The LED current is internally set to 20mA. The series connection allows the LED current to be identical for uniform brightness and minimizes the number of traces to the LEDs. Brightness control is achieved by applying a PWM signal on enable with frequencies up to 30kHz.

The LM3519 features a proprietary PFM regulation architecture with switching frequencies between 2MHz to 8MHz, minimizing inductor size.

Over-voltage protection circuitry and high frequency operation permit the use of low-cost small output capacitors. During shutdown, the output is disconnected from the input in order to avoid leakage current path through the LEDs to ground.

The LM3519 is available in a tiny 6-pin SOT-23 package.

产品特性

Drives 2 to 4 LEDs at 20mA
Up to 30kHz PWM Dimming Control Capability
>80% Peak Efficiency
Up to 8MHz Switching Frequency
Small External Components: 1µH - 3.3µH(typ.2.2μH) Inductor and 1µF Output Capacitor
True Shutdown Isolation
Over-Voltage Protection
Wide Input Voltage Range: 2.7V to 5.5V
Small Footprint SOT-23 Package

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