SBOSA24A July 2023 – December 2023 TMCS1123
PRODUCTION DATA
The TMCS1123 only requires a power supply (VS) on the low-voltage isolated side, which powers the analog circuitry independent of the isolated current input. VS determines the full-scale output range of the analog output VOUT, and can be supplied with any voltage between 3V and 5.5V. To filter noise in the power-supply path, place a low-ESR decoupling capacitor of 0.1µF between VS and GND pins as close as possible to the supply and ground pins of the device. To compensate for noisy or high-impedance power supplies, add more decoupling capacitance.
The TMCS1123 power supply VS can be sequenced independently of current flowing through the input. However, there is a power-on delay between VS reaching the recommended operating voltage and the analog output validation. During this power-on time, the output voltage VOUT can transition between GND and VS as the output transfers from a high impedance reset state to the active drive state. If this behavior must be avoided, then provide a stable supply voltage VS for longer than the power-on time prior to applying input current.