STEVAL-IFP021V1

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 ■ Fault condition flag ■ Enable pin ■ RoHS compliant persists, it goes into an open state, disconnecting the load from the power supply. If a continuous short-circuit is present on the 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 The STEVAL-IFP021V1 demonstration board is based on the STEF05 and STEF12 electronic fuses (E-Fuses). It is designed to help users evaluate the benefit of the complete protection offered by the E-Fuse family and to customize their own application. The E-Fuse family of hot-swap converters is designed to replace the mechanical fuses on low voltage power lines. The STEF05 and STEF12 are integrated electronic fuses optimized for monitoring output current and input voltage. 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. Both devices are equipped with a thermal protection circuit. The intervention of the thermal protection is signaled to the board monitoring circuits through a signal on the enable/fault pin that can be connected to other parts belonging to the same family to cause a simultaneous shutdown during failure events. Unlike mechanical fuses, which must be physically replaced after a single event, E-Fuses do not degrade in their performance after shortcircuit/thermal protection interventions and can be reset either by re-cycling the supply voltage or by using the enable pin. 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 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 2/4 Doc ID 022688 Rev 1 (EADER    CN (EADER    CN (EADER    CN (EADER      CN '.$ 6 '.$ 6 '.$ 3/52#% '.$ %.? %.? 'ATE '.$ 'ATE '.$ # 3/52#% '.$ )# N %.? 2      3/52#% 3/52#% 3/52#% 3/52#% DVDT '.$ 6 # '.$ 6IN  .# ) , %.&! 34%& 3/52#% )#      %.? '.$ # '.$ '.$ #   %.?    6 .# ) , '.$ # 6IN  3/52#% 3/52#% 3/52#% 3/52#% 3/52#% 34%& %.&! DVDT '.$ )# 2      '.$ # 3/52#% Figure 1. (EADER 3/52#% 1    CN Circuit schematic STEVAL-IFP021V1 Circuit schematic STEVAL-IFP021V1 circuit diagram !-V STEVAL-IFP021V1 2 Revision history Revision history Table 1. Document revision history Date Revision 27-Jan-2012 1 Changes Initial release. Doc ID 022688 Rev 1 3/4 STEVAL-IFP021V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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