ON Semiconductor

This PWM controller integrates power factor correction (PFC) and quasi−resonant flyback controllers necessary to implement a compact and highly efficient Ac-Dc LED driver for high performance, low ripple LED lighting applications. The PFC stage utilizes a proprietary multiplier architecture to achieve low harmonic distortion and near−unity power factor while operating in a Critical Conduction Mode (CrM). The quasi−resonant current−mode flyback stage features a proprietary valley−lockout circuitry, ensuring stable valley switching and works down to the 4th valley before toggles to a frequency foldback mode with a minimum frequency clamp beyond the 4th valley to eliminate audible noise. Skip mode operation allows excellent efficiency in light load conditions while consuming very low standby power consumption which is critical in SMART Lighting applications,

The NCL30060 is a switch mode power supply controller intended for low to medium power single stage power factor (PF) corrected LED Drivers. It employs a constant on−time control method to ensure near unity power factor across a wide range of input voltages and output power. It can be used for isolated flyback as well as buck topologies. The device offers a suite of robust protection features to ensure safe operation under a range of fault conditions.

The NCL30073 is a highly integrated PWM controller capable of delivering a rugged and high performance LED converter in a tiny TSOP−6 package. With a supply range up to 24 V, the controller hosts a 65 kHz switching circuitry operated in peak current mode control. When the voltage on FB pin decreases, the controller enters skip cycle.while limiting the peak current.

The NCL30080 is a PWM current mode controller targeting isolated flyback and non-isolated buck-boost constant current topologies. The controller operates in a quasi-resonant mode to provide high efficiency. Thanks to a novel control method, the device is able to precisely regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler.

The NCL30081 is a PWM current mode controller targeting isolated flyback and non-isolated buck-boost constant current topologies. The controller operates in a quasi-resonant mode to provide high efficiency. Thanks to a novel control method, the device is able to precisely regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler. This controller has integrated 5 step log dimming which allows and LED bulb to be dimming from a standard wall switch.

The NCL30082 is a PWM current mode controller targeting isolated flyback and non-isolated buck-boost constant current topologies. The controller operates in a quasi-resonant mode to provide high efficiency. Thanks to a novel control method, the device is able to precisely regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler. The device is highly integrated with a minimum number of external components. A robust suite of safety protection is built in to simplify the design. The device supports analog/digital dimming and thermal foldback. While the NCL30082 has integrated fixed overvoltage protection, the designer has the option to program a lower OVP level.

The NCL30083 is a PWM current mode controller targeting isolated flyback and non-isolated buck-boost constant current topologies. The controller operates in a quasi-resonant mode to provide high efficiency. Thanks to a novel control method, the device is able to precisely regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler. The device is highly integrated with a minimum number of external components. A robust suite of safety protection is built in to simplify the design. The device supports 5 step log dimming down to 5%. To enhance system lifetime, it has current foldback at a user programmable temperature point. While the NCL30083 has integrated fixed overvoltage protection, the designer has the option to program a lower overvoltage protection level.

The NCL30085 is an AC-DC power factor corrected flyback controller targeting isolated and non−isolated buck-boost/SEPIC constant current LED drivers. The controller operates in a quasi−resonant mode to provide optimal efficiency. Thanks to a novel control method, the device is able to tightly regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler. The device is highly integrated with a minimum number of external components. A robust suite of safety protection is built in to simplify the design. This controller has integrated 3 step log dimming which allows an LED bulb or luminaire to be dimming from a standard wall switch.In addition to steps of 70% and 25% which are similar to a traditional 3 way lamp, one additional step of 5% current is included to support deep dimming applications.

The NCL30086BH is a controller targeting isolated andnon−isolated "smart−dimmable" constant−current LED drivers.Designed to support flyback, buck−boost, and SEPIC topologies, itsproprietary current−control algorithm provides near−unity powerfactor and tightly regulates a constant LED current from the primaryside, thus eliminating the need for a secondary−side feedback circuitryor an optocoupler.Housed in the SOIC10 which has the same body size as a standardSOIC8, the NCL30086BH is specifically intended for very compactspace−efficient designs. The device is highly integrated with aminimum number of external components. A robust suite of safetyprotections is built in to simplify the design. To ensure reliableoperation at elevated temperatures, a user configurable currentfoldback circuit is also provided. In addition, it supports analog andPWM dimming with a dedicated dimming input intended to controlthe average LED current.Pin−to−pin compatible to the NCL30086, the NCL30086BHprovides the same benefits with in addition, an increased resolution ofthe digital current−control algorithm for a 75% reduction in the LEDcurrent quantization ripple.

The NCL30100 is a compact switching regulator controller intended for space constrained constant current high brightness LED driver applications where high efficiency and small size are important. The controller is based on a peak current, quasi fixed off time control architecture optimized for continuous conduction mode stepdown (buck) operation. This allows the output filter capacitor to be eliminated. In this configuration, a reverse buck topology is used to control a cost effective N-channel MOSFET.