Automotive 600V, 50mA isolated switch with reinforced isolation and avalanche protection

The TPSI2260-Q1

is an isolated solid state relay designed for high voltage automotive and industrial

applications. The TPSI2260-Q1 uses TI’s high reliability

reinforced capacitive isolation technology in combination with internal back-to-back MOSFETs

to form a completely integrated solution requiring no secondary side power supply. The TPSI2260-Q1 improves system reliability as TI’s capacitive

isolation technology does not suffer from mechanical wearout or photo degradation failure

modes common in mechanical relay and photo relay components.

The primary side of the device is powered by

only 5mA of input current and incorporates a fail-safe EN pin preventing

any possibility of back powering the VDD supply. In most applications, the VDD pin of the

device must be connected to a system supply from between 4.5V to 20V and the EN pin of the device must be

driven by a GPIO output with Logic high between 2.1V to 20V. In other applications, the VDD

and EN pins can be driven together driven together directly from the system supply or from a

GPIO output.

The secondary side consists of back-to-back

MOSFETs with a standoff voltage of ±600V from S1 to S2. The TPSI2260-Q1 MOSFET avalanche robustness and thermally conscious

package design allow it to robustly support system level dielectric withstand testing

(HiPot) and DC fast charger surge currents of up to 1mA (0.6mA for TPSI2240C-Q1 and 3mA for

TPSI2260T-Q1) without requiring any external components.