安森美公司的NCP3065是集成了1.5A開關的單片開關穩(wěn)壓器,可以配置成降壓模式或升壓模式.它的輸入電壓從3V到40V,能為高亮度LED(HBLED)提供恒流的電源.反饋電壓低到235mV,可以逐個周期地限流,廣泛應用在汽車和船舶照明,大功率LED驅動器,恒流源以及低壓LED照明.本文介紹了NCP3065的主要性能,應用電路以及評估板電路圖和所用的材料清單(BOM).

The NCP3065 is a monolithic switching regulator designed to dELiver constant current for powering high brightness LEDs (HBLED). The device has a very low feedback voltage of 235 mV (nominal) which is used to regulate the average current of the LED string. In addition, the NCP3065 has a wide input voltage up to 40 V to allow it to operate from 12 Vac or 12 Vdc supplies commonly used for lighting applications as well as unregulated supplies such as Lead Acid batteries.

The device can be configured in a controller topology with the addition of an external transistor to support higher LED currents beyond the 1.5 A rated switch current of the internal transistor. The NCP3065 switching regulator can be configured in Step-Down (Buck) and Step-Up (boost) topologies with a minimum number of external components.

特性:
Integrated 1.5 A Switch
Input Voltage Range from 3 V to 40 V
Low Feedback Voltage of 235 mV
Cycle-by-Cycle Current Limit
No Control Loop Compensation Required
Frequency of Operation Adjustable up to 250 kHz
Operation With All Ceramic Output Capacitors or No Output
Capacitance
Analog and Digital PWM Dimming Capability
Internal Thermal Shutdown with Hysteresis

應用:
Automotive and Marine Lighting
High Power LED Driver
Constant Current Source
Low Voltage LED Lighting(Landscape, Path, Solar, MR16 Replacement)