Three possible overload conditions can occur for the TPS2063 and TPS2067. In the first condition, the output has been shorted before the device is enabled or before V_I(IN) has been applied (see Figure 6-34 through Figure 6-36). The TPS2063 and TPS2067 senses the short and immediately switches into a constant-current output.

In the second condition, a short or an overload occurs while the device is enabled. At the instant the overload occurs, high currents may flow for a short period of time before the current-limit circuit can react. After the current-limit circuit has tripped (reached the overcurrent trip threshold (I_OC)), the device switches into constant-current mode and current is limited at the short-circuit output current threshold (I_OS).

In the third condition, the load has been gradually increased beyond the recommended operating current. The current is permitted to rise until the overcurrent trip threshold (I_OC) is reached or until the thermal limit of the device is exceeded. The TPS2063 and TPS2067 are capable of delivering current up to the current-limit threshold without damaging the device. Once the overcurrent trip threshold (I_OC) has been reached, the device switches into its constant-current mode current is limited at the short-circuit output current threshold (I_OS).