SN6501 - Low-noise, 350 mA, 410-kHz transformer driver for isolated power supplies

The SN6501 is a monolithic oscillator/power-driver, specifically designed for small form factor, isolated power supplies in isolated interface applications. The device drives a low-profile, center-tapped transformer primary from a 3.3-V or 5-V DC power supply. The secondary can be wound to provide any isolated voltage based on transformer turns ratio.

The SN6501 consists of an oscillator followed by a gate drive circuit that provides the complementary output signals to drive the ground referenced N-channel power switches. The internal logic ensures break-before-make action between the two switches.

The SN6501 is available in a small SOT-23 (5) package, and is specified for operation at temperatures from –40&de;C to 125°C.

• Push-Pull Driver for Small Transformers
• Single 3.3-V or 5-V Supply
• High Primary-side Current Drive:
  • 5-V Supply: 350 mA (Max)
  • 3.3-V Supply: 150 mA (Max)
• Low Ripple on Rectified Output Permits
  Small Output Capacitors
• Small 5-Pin SOT-23 Package