NCP3066: Constant Current Switching Regulator for HB-LEDs w/ ENABLE

Datasheet: NCP3066, NCV3066 Rev. 3 (1139.0kB)

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The NCP3066 is a monolithic switching regulator designed to deliver constant current for powering high brightness LEDs. 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 NCP3066 has a wide input voltage up to 40 V to allow it to operate from 12 Vac or 12 Vdc supply, commonly used for lighting applications as well as unregulated supplies such as rechargeable batteries. The NCP3066 switching regulator can be configured in Step-Down (Buck) and Step-Up (Boost) and Voltage-Inverting topologies with a minimum number of external components. An NCV3066 automotive version is available and without the ON/OFF feature as the NCP3065.

Features		Benefits
Integrated 1.5 A Switch		Integrated switch provides for small footprint
Input Voltage Range from 3 V to 40 V		Flexibility to operate from 12Vac or 12Vdc supplies commonly used for lighting applications
Low Feedback Voltage of 235 mV		Allows the use of small / low cost sense resistor
Cycle-by-Cycle Current Limit		Enhanced protection features
No Control Loop Compensation Required		Easy design-in
Frequency of Operation Adjustable up to 250 kHz		Optimization of efficiency and size
Operation With All Ceramic Output Capacitors or No Output Capacitance		Reduce size and cost by eliminating output capacitor
Internal Thermal Shutdown with Hysteresis		Enhanced protection features
ON/OFF pin for direct PWM dimming		Provides dimming up to 1kHz frequency
ON/OFF pin disabling the regulator		Low power standby (<100µA)

Applications		End Products
Constant Current Source High Power LED Driver High Brightness LED (HBLED)		MR-16 Replacement Automotive LED Headlight

Technical Information
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Data Sheets (1)	Evaluation Board Documents (20)