Texas Instruments has débuted a new LED controller with constant power regulation. The LM3447 AC/DC LED driver includes a dimmer detect, phase decoder and adjustable hold current circuits to provide smooth and flicker-free dimming operation in off-line, isolated LED lighting applications, including A19, E26/27 and PAR30/38 bulbs, as well lighting retrofits.
Traditional drivers use constant current control to accurately regulate LED forward current. This approach produces consistent light output or intensity from LEDs in the same bin. However, once current is applied to the LED, its solder point temperature rises, leading to a decrease in forward voltage and a drop in efficacy.
Conversely, by using the new LM3447 with constant power regulation, the LED forward voltage droop over temperature is offset by an increase in LED current to maintain constant LED power. The result is up to 10% improvement in efficacy across the expected operating temperature range of the fixture.
Integrated phase dimmer decoding and dimmer detection circuitry allows for easy design and high efficiency. The device operates with leading edge (TRIAC) and trailing edge dimmers. Its primary side control supports isolated lighting designs without optocouplers.
The IC features a fixed-frequency, discontinuous conduction mode flyback topology with valley switching to simplify EMI filter design. Greater than 0,9 power factor correction meets all regulatory requirements. Thermal fold-back protects LED arrays from over-temperature while still providing reduced light output. LED open- and short-circuit protection and driver IC thermal shutdown protect lamp electronics from damage during fault conditions.
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