LT3743 的典型應用是一款固定頻率同步降壓 DC/DC
控制器，設計用于驅動大
電流 LED。平均電流模式控制器將在 0V 至 (VIN - 2V) 的寬輸出電壓范圍內保持
電感器電流調節。 LED 調光是通過 CTRL_L、CTRL_H 和 CTRL_T 引腳上的模擬調光以及 PWM 和 CTRL_SEL 引腳上的 PWM 調光來實現的。通過使用外部開關負載
電容器，LT3743 能夠在幾個 us 內改變穩壓 LED 電流水平，從而在兩個電流水平之間提供準確、高速的 PWM 調光。開關頻率可通過 RT 引腳上的外部
電阻在 200kHz 至 1MHz 范圍內進行編程
說明
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Typical Application for LT3743 is a fixed frequency synchronous step-down DC/DC controller designed to drive high current LEDs. The average current mode controller will maintain inductor current regulation over a wide output voltage range of 0V to (VIN - 2V). LED dimming is achieved through analog dimming on the CTRL_L, CTRL_H and CTRL_T pins and with PWM dimming on the PWM and CTRL_SEL pins. Through the use of externally switched load capacitors, the LT3743 is capable of changing regulated LED current levels within several us, providing accurate, high speed PWM dimming between two current levels. The switching frequency is programmable from 200kHz to 1MHz through an external resistor on the RT pin
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