Datasheet Linear Technology LT8672 — Даташит

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Design Notes

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  Active Rectifier Controller with Ultrafast Transient Response and Low Power Dissipation &mdash DN572
  PDF, 657 Кб, Файл опубликован: 14 фев 2018
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  Design Note
  Active Rectifier Controller with Ultrafast Transient Response and
  Low Power Dissipation
  Bin Wu
  Introduction
  The LT8672 is an active rectifier controller that (along
  with a MOSFET) provides reverse current protection and
  rectification for power supplies in automotive environments.
  This job is traditionally taken on by a Schottky diode, over
  which the LT8672’s active protection has a number of
  advantages: Minimal power dissipation Small, predictable, regulated 20mV voltage drop
  The LT8672 also includes a number of features to satisfy
  supply rail requirements in automotive environments: Reverse input protection to –40V Wide input operation range: 3V to 42V Ultrafast transient response Rectifies 6VP-P up to 50kHz; rectifies 2VP-P up to 100kHz Integrated boost regulator for the FET driver performs
  better than charge pump devices
  Figure 1 shows a complete protection solution. Fast Response for Input Ripple Rectification
  Automotive standards—ISO 16750 or LV124—specify
  that automotive electronic control units (ECUs) may face a
  supply with a superimposed AC ripple of up to 6VP-P at up to
  30kHz. The LT8672's gate driver that controls the external
  MOSFET is strong enough to handle ripple frequencies of up VBATT
  12V to 100kHz, which minimizes reverse current. An example of
  such an AC ripple rectification is shown in Figure 2. Low Power Dissipation Compared with a
  Schottky Diode …

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• Monitor, Control and Protection > PowerPath Controllers & Ideal Diodes