Primary Side Controller 8-Pin SOIC-EP T/R

The MAX256ASA/V+T is an integrated primary-side controller and H-bridge driver for isolated power-supply circuits. The device contains an on-board oscillator, protection circuitry and internal FET drivers to provide up to 3W of power to the primary winding of a transformer. The MAX256ASA/V+T can be operated using the internal programmable oscillator or can be driven by an external clock for improved EMI performance. Regardless of the clock source being used, an internal flip-flop stage guarantees a fixed 50% duty cycle to prevent DC current flow in the transformer. The MAX256ASA/V+T operates from a single-supply voltage of +5V or +3.3V, and includes under voltage lockout for controlled startup. The device prevents cross-conduction of the H-bridge MOSFETs by implementing break before-make switching. Thermal shutdown circuitry provides additional protection against damage due to over temperature conditions. The MAX256ASA/V+T is available in the 8-pin thermally-enhanced SO package. The device is specified for the automotive (-40°C to +125°C) temperature range.

• Simple, Flexible Design Provides Up to 3W to the Transformer in Isolated Power Supplies
  • Single Supply +5V or +3.3V Operation
  • Internal Resistor-Programmable Oscillator Mode
  • External Clock Mode with Watchdog
  • Disable Mode
• Integrated System Protection
  • Undervoltage Lockout
  • Thermal Shutdown
• Saves Space on Board
  • 8-Pin Thermally-Enhanced SO Package