Extended temperature range, isolated switch driver with integrated 10V gate supply

The TPSI3050M is

a fully integrated, isolated 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 10V with 1.5A and 3.0A peak source and sink current, a large

variety of external power switches can be chosen to meet a wide range of applications. The

TPSI3050M generates its own secondary bias supply from

the power received from its primary side, so no isolated secondary supply bias is required.

Additionally, the TPSI3050M can optionally supply power to

external supporting circuitry for various application needs.

The TPSI3050M supports two modes of operation based on the

number of input pins required. In two-wire mode, typically found in driving mechanical

relays, controlling the switch requires only two pins and supports a wide voltage range of

operation of 6.5V to 48V. In three-wire mode, the primary supply of 3V to 5.5V is supplied

externally, and the switch is controlled through a separate enable.

The secondary side provides a regulated, floating

supply rail of 10V for driving a large variety of power switches

with no need for a secondary bias supply. The application can drive single power switches

for DC applications or dual back-to-back power switches for AC applications, as well as

various types of SCR. The TPSI3050M integrated isolation

protection is extremely robust with much higher reliability, lower power consumption, and

increased temperature ranges than traditional mechanical relays and optocouplers.

The power transfer of the TPSI3050M can be adjusted by selecting one of seven power

level settings using an external resistor from the PXFR pin to VSSP. This action allows for

tradeoffs in power dissipation versus power provided on the secondary depending on the needs

of the application.