STEVAL-IFP021V1 STMicroelectronics

STEVAL-IFP021V1 5 V and 12 V power line protection based on STEF05 and STEF12 electronic fuses Data brief Features Input voltages: 5 V and 12 V Continuous current: 3.6 A (typ.) each Adjustable slew rate for output voltage Overvoltage clamp Undervoltage lockout Programmable short-circuit current limit Overload current limit Controlled output voltage ramp Thermal latch protection persists, it goes into an open state, disconnecting Fault condition flag the load from the power supply. Enable pin If a continuous short-circuit is present on the RoHS compliant board, when power is re-applied the E-Fuse initially limits the output current to a safe value, and then again goes into an open state. Description Both devices are equipped with a thermal The STEVAL-IFP021V1 demonstration board is protection circuit. based on the STEF05 and STEF12 electronic The intervention of the thermal protection is fuses (E-Fuses). signaled to the board monitoring circuits through It is designed to help users evaluate the benefit of a signal on the enable/fault pin that can be the complete protection offered by the E-Fuse connected to other parts belonging to the same family and to customize their own application. family to cause a simultaneous shutdown during failure events. The E-Fuse family of hot-swap converters is designed to replace the mechanical fuses on low Unlike mechanical fuses, which must be voltage power lines. physically replaced after a single event, E-Fuses do not degrade in their performance after short- The STEF05 and STEF12 are integrated circuit/thermal protection interventions and can be electronic fuses optimized for monitoring output reset either by re-cycling the supply voltage or by current and input voltage. using the enable pin. Connected in series to the 5 V/12 V rails, they are capable of protecting the electronic circuitry on the output from overcurrent and overvoltage. The turn-on time is programmable by means of an external capacitor, allowing control of the inrush current at startup and during hot-swaps. When an overload condition occurs, the E-Fuse limits the output current to a predefined safe value. If the anomalous overload condition January 2012 Doc ID 022688 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 ) ) 34%& ) 34%& Circuit schematic STEVAL-IFP021V1 1 Circuit schematic Figure 1. STEVAL-IFP021V1 circuit diagram . %3/52 %3/52 %3/52 3/52 % %3/52 %3/52 N TDV D ) , . ) , . DV D T %. & . N %3/52 3/52 % %3/52 %3/52 %3/52 N % ATE % 3/52 . % % %. ATE 3/52 . 3/52 CN CN CN CN CN (EADER (EADER (EADER (EADER (EADER - V 2/4 Doc ID 022688 Rev 1 %. %. %. %. & 6I 6I 2 2 6 6 6 6