Microchip Technology Driver per LED lineari sequenziali CL880x
I driver per LED lineari consequenziali CL880x di Microchip sono progettati per pilotare lunghe stringhe di LED a bassa tensione e basso costo nelle attuali sostituzioni allo stato solido in tubi fluorescenti, lampadine a incandescenza e lampade CFL. Entrambi i CI riducono al minimo il numero dei componenti del circuito pilota, richiedendo solo quattro o sei resistori e un ponte di diodi in aggiunta al CI. Da due a quattro componenti aggiuntivi nel circuito offrono protezione transitoria, e non sono necessari né condensatori né componenti magnetici. Poiché i circuiti integrati sono regolatori di tensione lineare a più stadi, non sono presenti correnti di commutazione ad alta frequenza eliminando la necessità di un filtro EMI front-end. Il modello CL8800 è destinato all'ingresso a 230 VCA, mentre il modello CL8801 è destinato all'ingresso a 120 VCA. Efficienze luminose superiori a 115 lm/W sono raggiungibili con entrambi i driver per LED lineari sequenziali Microchip CL880x.
CL8800 has six current regulator outputs and CL8801 has four. These outputs tap a string of series/parallel LEDs, and the regulators sink current at each tap and are sequentially turned on and off automatically, tracking the input sine wave voltage. The voltage across each regulator is minimized when conducting, providing typical efficiency of greater than 90%. The output current at each tap is individually resistor-adjustable. Cross regulation provides smooth transitions as the IC switches from one regulator to another. The current waveforms of both ICs can be tailored to optimize for input voltage range, line/load regulation, output power/current, efficiency, power factor, THD, dimmer compatibility, and LED utilization. Both ICs are compatible with phase dimming with the addition of an RC network.
CL8800 and CL8801 deliver easy retrofit solutions for designers looking to replace existing fluorescent tubes or incandescent bulbs with more energy-efficient solid-state lighting fixtures. The minimal component count required for both devices, as well as their efficient operation, make them an extremely attractive solution in terms of cost and performance. CL8800 and CL8801 are available in 40-lead QFN packages and are RoHS compliant.
Caratteristiche
- Minimal component count
- No magnetics, no capacitors
- Low conducted EMI w/o filters
- 80-90% LED utilization
- Phase dimmer compatible with RC network
Specifiche
- Up to 13W output
- Typical electrical efficiency: 85-90%
- >115Lm/W using efficient LEDs
- >0.9 power factor
- <10% THD line current (CL8800) or<30% THD line current (CL8801)
Applicazioni
- Fluorescent tube retrofit
- Incandescent and CFL bulb replacement
- General LED lighting