Regulator Employs Low-Voltage Feedback for Current Control

The NCP3066 is a monolithic switching regulator designed to power high-brightness LEDs with a constant-current source.

To regulate the average current of an LED string, the device uses a low feedback voltage of just 235mV.

In addition, the NCP3066 has a wide input-voltage range from 3V up to 40V, allowing it to operate from a 12V AC or a 12V DC to 36V DC supply. These voltages are commonly employed in lighting applications as well as unregulated supplies such as rechargeable batteries.

The NCP3066 switching regulator can be configured in step-down (buck), step-up (boost) and voltage-inverting topologies with a minimum number of external components. Additionally, an On/Off pin provides PWM dimming and a low-power shutdown mode.

 

FEATURES Integrated 1.5A switch Logic-level shutdown capability Low feedback voltage of 235mV Cycle-by-cycle current limiting Frequency of operation adjustable up to 250kHz Analogue and digital PWM-dimming capability Thermal shutdown with hysteresis

APPLICATIONS Automotive and marine lighting Constant-current source circuits High-brightness LED drivers Low-voltage LED lighting

 

 

 

• NIC Components’Quick Kit, page 090119

 

ON Semiconductor / NCP3066