|電流 - 輸出/通道||750mA±5%|
The IS31LT3352 is a continuous mode inductive step-down converter, designed for driving a single LED or multiple series connected LEDs efficiently from a voltage source higher than the required LED voltage. The chip operates from an input supply between 6V and 40V and provides an externally adjustable output current of up to 750mA. Depending upon supply voltage and external components, this can provide up to 30 watts of output power. The IS31LT3352 includes an integrated output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. The IS31LT3352 integrates temperature compensation function in order to maintain LEDs’ stable and reliable operation. The IS31LT3352 measures the thermistance mounted close to LEDs. When ambient temperature near LEDs goes too high and the Negative Temperature Coefficient thermistors reach the value of threshold resistance connected at RTH pin, output current starts to reduce automatically. After the ambient temperature falls down to a safe temperature，the current will return to the set value. The IS31LT3352 can be connected as LED drivers’ chain with the same temperature compensation percentage. In this chain, every IS31LT3352’s ADJO output pin drives next stage’s IS31LT3352 ADJI input pin with temperature compensation information. So, only one thermistor is needed in the whole IS31LT3352 system.