Characteristics and application of 1A step-down constant current LED driver chip AT8860

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The AT8860 is a step-down constant current driver chip that drives high-brightness LEDs. The AT8860 uses very few external components to provide a very cost-effective price for MR16 LED lamp cups, LED stage lights, automotive LED lights, solar LED lights and LED street lights. s solution. The AT8860's input voltage ranges from 5 volts to 40 volts. The output current is set by a sampling resistor. The maximum output current of a single LED can be up to 1000 mA. The AT8860's constant current control method allows LED current accuracy to be as high as ±3%. The AT8860 accepts 0.5-2.5V analog dimming and a wide frequency range PWM dimming via the ADJ pin. When the voltage of the DIM is lower than 0.3V, the power switch is turned off and the AT8860 enters a standby state with extremely low operating current. The AT8860 has a built-in power switch that can drive multiple 1 watt or single 3 watt LEDs depending on the input voltage. The AT8860 includes over temperature protection, LED short circuit and open circuit protection. The AT8860 is available in SOT89-5, ESOP8, and SOP8 packages.

Pin definition

Main parameters:

● Up to 40V working voltage, safer and more adaptable;

● Current drive capability 1A, can load 1W or 3W LED;

●The constant current effect is stable and is not affected by voltage fluctuations;

●The peripheral device is simple and the efficiency is extremely high, up to 95%;

●Over-temperature protection and over-current protection to make the system more secure;

● Operating temperature: -40 ° C --- +125 ° C, the temperature tolerance is higher than the similar program 25%;

● Package SOT89-5, SOP8

Typical application circuit:

main application:

MR16/11 LED spotlight instead of halogen

Car LED light

LED stage light

Solar LED light

LED signal light

LED street light