SLVSE57C June 2017 – April 2018 TPS2595
In the case of a short circuit and overload current limit when the device interrupts current flow, the input inductance generates a positive voltage spike on the input, and the output inductance generates a negative voltage spike on the output. The peak amplitude of voltage spikes (transients) is dependent on the value of inductance in series to the input or output of the device. Such transients can exceed the absolute maximum ratings of the device if steps are not taken to address the issue. Typical methods for addressing transients include:
The approximate value of input capacitance can be estimated with Equation 18:
Some applications may require the addition of a Transient Voltage Suppressor (TVS) to prevent transients from exceeding the absolute maximum ratings of the device.
The circuit implementation with optional protection components (a ceramic capacitor, TVS and Schottky diode) is shown in Figure 67.