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Current-Mode PWM Controllers with Integrated Startup Circuit

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Wide Input Range: (18V to 110V) or (13V to 36V)
  • Isolated (without optocoupler) or nonisolated power supply
  • Current-Mode Control
  • Leading-Edge Blanking
  • Internally Trimmed 275kHz ±10% Oscillator
  • Low External Component Count
  • Soft-Start
  • High-Voltage Startup Circuit
  • Pulse-by-Pulse Current Limiting
  • Thermal Shutdown
  • SO-8 Package

Applications/Uses

  • Industrial Power Supplies
  • Isolated Power Supplies
  • Networking Power Supplies
  • Telecom Power Supplies

Description

The MAX5019/MAX5020 integrate all the building blocks necessary for implementing DC-DC fixed-frequency power supplies. Either primary- or secondary-side regulation may be used to implement isolated or nonisolated power supplies. These devices are current-mode controllers with an integrated high-voltage startup circuit suitable for telecom/industrial voltage range power supplies. Current-mode control with leading-edge blanking simplifies control-loop design and internal ramp compensation circuitry stabilizes the current loop when operating at duty cycles above 50% (MAX5019). The MAX5019 allows 85% operating duty cycle and can be used to implement flyback converters whereas the MAX5020 limits the operating duty cycle to less than 50% and can be used in single-ended forward converters. A high-voltage startup circuit allows these devices to draw power directly from the 18V to 110V input supply during startup. The switching frequency is internally trimmed to 275kHz ±10%, thus reducing magnetics and filter component costs.

The MAX5019/MAX5020 are available in 8-pin SO packages.

Warning: The MAX5019/MAX5020 operate with high voltages. Exercise caution.

Simplified Block Diagram

MAX5019, MAX5020: Typical Operating Circuit MAX5019, MAX5020: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.