Boost Led Driver With 1:3000 Dimming Ratio And Excellent Current Regulation


Posted on Feb 5, 2014

The BQ2000 is a programmable, monolithic IC for fast-charge management of nickel cadmium (NiCd), nickel metal-hydride (NiMH), or lithium-ion (Li-Ion) batteries in single- or multi-chemistry applications. The BQ2000 detects the battery chemistry and proceeds with the optimal charging and termination algorithms. This process eliminates undesirable u


Boost Led Driver With 1:3000 Dimming Ratio And Excellent Current Regulation
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ndercharged or overcharged conditions and allows accurate and safe termination of fast charge. Depending on the chemistry, the BQ2000 provides a number of charge termination criteria: Peak voltage, PVD (for NiCd and NiMH) Minimum charging current (f or Li-Ion) Maximum temperature Maximum charge time For safety, the BQ2000 inhibits fast charge until the battery voltage and temperature are within user-defined limits. If the battery voltage is below the low-voltage threshold, the BQ2000 uses trickle-charge to condition the battery. For NiMH batteries, the BQ2000 provides an optional top-off charge to maximize the battery capacity. The integrated high-frequency Comparator allows the BQ2000 to be the basis for a complete, high-efficiency power-conversion circuit for both nickel-based and lithium-based chemistries.




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