LM3434 - 具有高频明暗调节的常见阳极高亮度 LED 驱动器

LM3434是TI德州仪器公司的一款LED照明-照明产品，LM3434是具有高频明暗调节的常见阳极高亮度 LED 驱动器，本站介绍了LM3434的封装应用图解、特点和优点、功能等，并给出了与LM3434相关的TI元器件型号供参考。

LM3434 - 具有高频明暗调节的常见阳极高亮度 LED 驱动器 - LED照明-照明 - LED驱动器 - 德州仪器

产品描述

The LM3434 is an adaptive constant on-time DC/DC buck (step-down) constant current controller (a true current source). The LM3434 provides a constant current for illuminating high power LEDs. The output configuration allows the anodes of multiple LEDs to be tied directly to the ground referenced chassis for maximum heat sink efficacy. The high frequency capable architecture allows the use of small external passive components and no output capacitor while maintaining low LED ripple current. Two control inputs are used to modulate LED brightness. An analog current control input is provided so the LM3434 can be adjusted to compensate for LED manufacturing variations and/or color temperature correction. The other input is a logic level PWM control of LED current. The PWM functions by shorting out the LED with a parallel switch allowing high PWM dimming frequencies. High frequency PWM dimming allows digital color temperature control, interference blanking, field sequential illumination, and brightness control. Additional features include thermal shutdown, VCC under-voltage lockout, and logic level shutdown mode. The LM3434 is available in a low profile 24-pin WQFN package.

产品特性

Operating Input Voltage Range of –9V to -30V w.r.t. LED Anode
Control Inputs are Referenced to the LED Anode
Output Current Greater than 6A
Greater than 30kHz PWM Frequency Capable
Negative Output Voltage Capability Allows LED Anode to be Tied Directly to Chassis for Maximum Heat Sink Efficiency
No Output Capacitor Required
Up to 1MHz Switching Frequency
Low IQ, 1mA Typical
Soft Start
Adaptive Programmable ON Time Allows for Constant Ripple Current
24-Pin WQFN Package

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