LINEAR TECHNOLOGY DC2020A 演示板, LT3955, 0.3A/67V, 发光二极管驱动器
The is a Demonstration Board for LT3955EUHE a 60VIN 80VOUT LED Driver. It generates its own PWMOUT waveform from its internal PWM generator for accurate PWM dimming with up to 33:1 brightness ratio. It accepts an input voltage from 5 to 60V and drives up to 67V of LEDs at 300mA when PVIN is less than VLED. The board features both PWM and analogue dimming of the LED string. It has an OPENLED flag that indicates when the LED string has been removed. The board features high efficiency at 350kHz switching frequency. At high LED string voltages up to 67V and 300mA of LED current, the single switch controller has 92% efficiency. The LT3955 has an internal 80V, 3.5A switch that simplifies the schematic and layout.