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Parallelable, Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs

Secondary-Side, Synchronous-Rectifier Drivers Integrate Shunt Reference, Current Sharing, and Voltage Margining

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Clean Drive Waveforms for Synchronous MOSFETs
  • Utilization of a Look-Ahead Signal from the Primary for Proper Turn-On/Turn-Off Times
  • Synchronous Rectifier Drivers Capable of Sourcing and Sinking Up to 2A Peak Current
  • Internal Gate-Voltage Regulator for 5V (MAX5058) or 10V (MAX5059) Gate-Drive Voltage
  • Internal Error Amplifier
  • Accurate Differential Current-Share/Force Circuit Allows Paralleling of Several Power Supplies for High Output Current
  • Internal Remote Voltage-Sense Amplifier
  • Flexible Reference-Voltage Generation
  • Output Voltage Regulation Down to 0.5V
  • Low Quiescent Current Consumption of 2.5mA
  • Integrated Digital Output Margining Circuit Saves External Parts and Board Space
  • 30ns Propagation Delay Time from Pulse Input to Output
  • Automatic Detection of Discontinuous Current Conduction and Turn-Off of the Freewheeling MOSFET
  • High Efficiency at Low Output Currents and Reverse-Current Protection
  • Open-Drain Overtemperature Warning Flag
  • 28-Pin Thermally Enhanced TSSOP Package

Applications/Uses

  • ±48V Power-Supply Modules
  • ±48V/±12V Server Power Supplies
  • Industrial Power Supplies
  • Isolated Networking Power Supplies
  • Isolated Telecom Power Supplies

Description

The MAX5058/MAX5059 enable secondary-side synchronous rectification in isolated power supplies using widely available power MOSFETs. These devices facilitate the commutation of the secondary-side MOSFETs by providing a clean gate-drive signal that is synchronized to the power MOSFET switching in the primary side of the isolation transformer. The MAX5058/MAX5059 complement the MAX5051 and MAX5042/MAX5043 primary-side PWM ICs and enable the design of high-efficiency, synchronously rectified, isolated power supplies. Simultaneous conduction of the primary side and the freewheeling synchronous rectifier MOSFET is avoided by having a look-ahead signal (before the primary-side MOSFETs turn ON), thus eliminating large current spikes resulting from a shorted transformer secondary.

An on-board error amplifier with a versatile current reference output enables virtually unlimited possibilities in reference-voltage generation. Reference voltage for the error amplifier is generated by connecting an appropriate resistor to this output.

Low on-resistance margining MOSFETs integrated on-chip allow for implementation of a margining circuit without the use of external switches. The MAX5058 provides a 5V LDO output for logic-level MOSFETs, while the MAX5059 provides a 10V LDO output for conventional 10V MOSFETs.

The MAX5058/MAX5059 are designed to enable paralleling of multiple power supplies for accurate current sharing using a simple 2-wire, differential, current-share bus. Parallelability enables expansion of the power capabilities and simplifies thermal management in high-output-current applications. When used with the MAX5051, the primaries can also be synchronized and operated 180 degrees out of phase.

The MAX5058/MAX5059 are available in a 28-pin thermally enhanced TSSOP package and operate over a wide -40°C to +125°C temperature range.

Warning: The MAX5058/MAX5059 are designed to work in circuits that contain high voltages. Exercise caution.

Simplified Block Diagram

MAX5058, MAX5059: Pin Configuration MAX5058, MAX5059: Pin Configuration 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 .