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  How to Design an Isolated, High Frequency, Push-Pull DC/DC Converter &mdash LT Journal
  PDF, 931 Kb, Datei veröffentlicht: Apr 7, 2015
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  design ideas How to Design an Isolated, High Frequency, Push-Pull
  DC/DC Converter
  Dawson Huang A simple push-pull DC/DC converter with a fixed 50% duty cycle is often used as a low
  noise transformer driver in communication systems, medical instruments and distributed
  power supplies. This simple scheme provides no voltage regulation—requiring a low
  dropout (LDO) post regulator—a combination that presents potentially serious problems.
  First, any significant variation in the driver’s input voltage, along with the fixed 50% duty
  cycle, can increase the differential voltage across the LDO, resulting in significant power
  losses and high temperature rise in the LDO. Second, low switching frequency requires
  relatively bulky transformers, sometimes occupying 30% to 50% of the converter space.
  The LT3999 monolithic DC/DC push-pull
  driver avoids these issues with two important features: duty cycle control and high
  frequency operation: Duty cycle control allows compensation
  for wide VIN variation—something standard fixed duty cycle transformer drivers cannot do—greatly reducing LDO
  loss when facing a wide input range. High switching frequency, up to
  1MHz , leads to smaller transformers and lower output ripple. wide input range, the other for a
  compact high frequency transformer
  driver with fixed input voltage. The LT3999 combines these two
  features with high 36V input voltage
  and 1A input current capabilities,
  making it a high power and flexible
  low noise push-pull converter IC. PUSH-PULL DC/DC CONVERTER
  DESIGN FOR WIDE RANGING INPUT This article presents two step-bystep design procedures: One for a …

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Herstellerklassifikation

• Power Management > Switching Regulator > Ultralow Noise Regulators | Flyback, Forward and Isolated Controllers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators

Andere Namen:

LT3999IDDPBF, LT3999IDD PBF