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Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Wide Input Range: (18V to 110V) or (13V to 36V)
  • 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 MAX5014/MAX5015 integrate all the building blocks necessary for implementing DC-DC fixed-frequency isolated power supplies. These devices are current-mode controllers with an integrated high-voltage startup circuit suitable for isolated 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% (MAX5014). The MAX5014 allows 85% operating duty cycle and could be used to implement flyback converters, whereas the MAX5015 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 MAX5014/MAX5015 are available in 8-pin SO packages. An evaluation kit (MAX5015EVKIT) is also available.

Warning: The MAX5014/MAX5015 are designed to operate with high voltages. Exercise caution.

Simplified Block Diagram

MAX5014, MAX5015: Typical Operating Circuit MAX5014, MAX5015: 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 .