Power Electronics

Highly Optimized LED Lighting Chipset

ON Semiconductor has introduced two new LED drivers to help designers optimize their solutions for automotive, industrial and general lighting applications. The NCL30051 stage, power factor correction and Resonant Half Bridge, LED driver combined with the new NCL30160, a dimmable constant current step-down LED driver, provide an ideal solution for high-brightness LED driver applications where space is limited and high efficiency is important.

The NCL30051 is a dedicated LED power supply IC capable of delivering a constant voltage to a step-down DC-DC converter/LED driver (e.g. NCL30160). The device, which combines a critical conduction mode (CrM), PFC controller and a half-bridge resonant controller with a built-in 600 V driver, is optimized for off-line power supply applications - all the features needed to implement highly efficient, small form factor designs. The NCL30051’s half-bridge stage operates at a fixed frequency. Regulation is achieved by adjusting the PFC stage output voltage. The device integrates open feedback loop protection, plus PFC overvoltage and undervoltage detection mechanisms, as well as an adjustable frequency oscillator which can be set at up to 75 kHz.

The NCL30160, a switching regulator for high power LEDs, takes the constant voltage delivered by the NCL30051-enabled power supply and steps down the voltage to provide a constant current across the LED string. Solutions with up to 98 percent efficiency are achieved by utilizing the low 55 mΩ internal MOSFET and the ability to operate at 100 percent duty cycle. This constant current device operates with an input voltage range from 6.3 V to 40 V, which makes it ideal for industrial and automotive applications. High switching frequencies up to 1.4 MHz allow the use of smaller external components helping to minimize board size and cost. The hysteretic control of the NCL30160 provides fast response during load transients and eliminates the need for small signal control loop compensation components. Protection features include resistor-programmed LED current, shorted LED protection, undervoltage lockout and thermal shutdown.

Both the NCL30051 and the NCL30160 have operating junction temperature ranges of -40 °C to +125 °C. The NCL30160 is offered in a SOIC'8 package and the NCL30051 is offered in SOIC16 package.

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