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  LTC3202 Charge Pump Improves Efficiency for Powering White LEDs &mdash LT Journal
  PDF, 171 Kb, Datei veröffentlicht: Sep 1, 2001
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  DESIGN IDEAS LTC3202 Charge Pump Improves
  Efficiency for Powering White LEDs
  by Steven Martin
  Introduction
  White LEDs continue to make significant inroads as backlights for color
  active-matrix liquid crystal displays
  in portable equipment. They offer size,
  reliability and cost advantages over
  competing solutions such as cold
  cathode fluorescent lamps (CCFLs).
  However, they require a higher voltage than can be provided by a sagging
  lithium-ion battery. Charge pumps
  provide an economical and compact
  means of attaining a modest increase
  in voltage.
  Although charge pump solutions
  are simple, they can have drawbacks.
  They are typically noisy and have only IIN
  100mA/DIV 0mA 200ns/DIV Figure 2. Input current waveform at the input bypass capacitor DESIGN IDEAS
  LTC3202 Charge Pump Improves
  Efficiency for Powering White LEDs
  . 31
  Steven Martin SMBus Controls CPU Voltage …

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• Power Management > Inductorless (Charge Pump) DC/DC Converters > Regulated Step-Up Charge Pumps | Inductorless (Charge Pump) LED Drivers

Andere Namen:

LTC3202EMSTRPBF, LTC3202EMS TRPBF