The TPSI3050 is a fully integrated, isolated power switch driver, which when combined with an external power switch, forms a complete isolated Solid State Relay (SSR). With a nominal gate drive voltage of 10 V and 1.5/3.0-A peak source and sink current, a large variety of external power switches can be chosen to meet a wide range of applications. The TPSI3050 generates its own secondary supply from the power received from its primary side, so no isolated secondary bias supply is required.

The Functional Block Diagram shows the primary side that includes a transmitter that drives an alternating current into the primary winding of an integrated transformer at a rate determined by the setting of the PXFR pin and the logic state of the EN pin. The transmitter operates at high frequency to optimally drive the transformer to its peak efficiency. In addition, the transmitter uses spread spectrum techniques to greatly improve EMI performance, allowing many applications to achieve CISPR 25 - Class 5. During transmission, data information transfers to the secondary side alongside with the power. On the secondary side, the voltage induced on the secondary winding of the transformer is rectified, and the shunt regulator regulates the output voltage level of VDDH. Lastly, the demodulator decodes the received data information and drives VDRV high or low based on the logic state of the EN pin.