Datasheet Linear Technology LTC4416-1 — Datenblatt

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LTC4416

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  Supercapacitors Can Replace a Backup Battery for Power Ride-Through Applications &mdash DN450
  PDF, 94 Kb, Datei veröffentlicht: Sep 4, 2008
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  Supercapacitors Can Replace a Backup Battery for
  Power Ride-Through Applications -Design Note 450
  Jim Drew
  Introduction
  Supercapacitors (or ultracapacitors) are п¬Ѓnding their way
  into an increasing number of applications for short-term
  energy storage and applications that require intermittent
  high energy pulses. One such application is a power ridethrough circuit, in which a backup energy source cuts
  in and powers the load if the main power supply fails
  for a short time. This type of application has typically
  been dominated by batteries, but electric double layer
  capacitors (EDLCs) are fast making inroads as their
  price-per-farad, size and effective series resistance per
  capacitance (ESR/C) continue to decrease.
  Figure 1 shows a 5V power ride-through application
  where two series-connected 10F, 2.7V supercapacitors
  charged to 4.8V can support 20W for over a second. The
  LTC3225, a new charge-pump-based supercapacitor
  charger, is used to charge the supercapacitors at 150mA
  and maintain cell balancing while the LTC4412 provides
  automatic switchover between the supercapacitor and
  the main supply. The LTM4616 dual output DC/DC
  ОјModuleTM regulator creates the 1.8V and 1.2V outputs. …

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  Complete Energy Utilization Improves Run Time of a Supercap Ride-Through Application by 40% &mdash DN485
  PDF, 106 Kb, Datei veröffentlicht: Oct 26, 2010
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  Complete Energy Utilization Improves Run Time of a Supercap
  Ride-Through Application by 40% – Design Note 485
  George H. Barbehenn
  Introduction
  Many electronic systems require a local power source that
  allows them to ride through brief main power interruptions without shutting down. Some local power sources
  must be available to carry out a controlled shutdown if
  the main power input is abruptly removed. Complete Energy Utilization Maximizes Run Time
  of Supercap Ride-Through Application
  Figure 1 shows a complete 3.3V/200mA ride-through application that maximizes the amount of power extracted
  from the supercap to support the load. A battery backup can supply power in the event of a
  mains shutdown, but batteries are not well suited to
  this particular application. Although batteries can store
  significant amounts of energy, they cannot deliver much
  power due to their significant source impedance. Also,
  batteries have п¬Ѓnite lives of ~2 to 3 years, and the maintenance required for rechargeable batteries is substantial. The LTC В®4425 complete 2A supercapacitor charger. It
  clamps the individual cell voltages to ensure that the
  cells do not overvoltage during charging and balances
  the cells throughout charge and discharge. The main components of the ride-through application
  include: The LTC3606 micropower buck regulator produces
  the regulated 3.3V output. Supercapacitors are well suited to such ride-through
  applications. Their low source impedance allows them
  to supply signiп¬Ѓcant power for a relatively short time, …

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