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Transformer driver

Isolated interface solution

The bundle of a SN6501 transformer driver from Texas Instruments (US) together with Wuerth Elektronik’s (Germany) WE-PP Push-Pull transformers is one of the smallest solutions for isolated interface designs according to the company.

The SN6501 provides isolated interface power supply for CAN, EIA-485, EIA-422, EIA-232, SPI, I2C and Low-Power LAN (Photo: TI)

THE BUNDLE IS SUITABLE FOR THE USE OF CAN as well as other interface designs with need for isolation or isolated DC/DC converter designs. The transformer driver comes in a 5-pin SOT23 housing. It is a monolithic oscillator/power-driver that was designed for small form factor, isolated power supplies in isolated interface applications. It drives a low-profile, center-tapped transformer primary from a 3,3 V (150 mA) or 5 V (350 mA) power supply. The secondary can be wound to provide isolated voltage based on the transformer turns ratio.

The transformer driver 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 so-called internal logic ensures break-before-make action between the two switches. This device is specified for operation at temperatures from -40 °C to 125 °C. And application fields are industrial automation, process control or medical equipment.

The SN6501 provides isolated interface power supply for CAN, EIA-485, EIA-422, EIA-232, SPI, I2C and Low-Power LAN (Photo: TI)