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TPD1S414 Scheda tecnica(PDF) 8 Page - Texas Instruments |
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TPD1S414 Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 19 page VOVP VBUS_SYS Overtemperature Condition EN VBUS_CON tDELAY tOFF_DELAY tSS VUVLO TPD1S414 SLLSEH9A –OCTOBER 2013–REVISED OCTOBER 2013 www.ti.com DEVICE INFORMATION DEVICE OPERATION The TPD1S414 provides a single-chip ESD protection, surge protection and over voltage protection solution for portable USB charging and Host interfaces. It offers over voltage protection at the VBUS_CON pin up to 30 V. The TPD1S414 also provides a ACK pin that indicates to the system if a fault condition has occurred. The TPD1S414 offers an ESD clamp and a Surge Clamp for VBUS_CON pin, thus eliminating the need for external TVS clamp circuits in the application. The TPD1S414 has an internal oscillator and charge pump that controls the turn-on of the internal nFET switch. The internal oscillator controls the timers that enable the charge pump and resets the open-drain ACK output. If VBUS_CON is less than VOVP, the internal charge pump is enabled. After a 15 ms internal delay, the charge-pump starts-up, turns on the internal nFET switch through a soft start. Once the nFET is completely turned ON, TPD1S414 asserts ACK pin LOW. At any time, if VBUS_CON rises above VOVP, the ACK pin is in High-Z and is pulled HIGH through external resistors. The nFET switch is turned OFF. OVP OPERATION When the VBUS_CON voltage rises above VOVP, the internal nFET switch is turned OFF, removing power from the system. The response is rapid, with the FET switch turning off in less than 100 ns. The ACK pin is set to High-Z when an overvoltage condition is detected and the nFET is turned OFF. This pin can be pulled up through external resistors to indicate a OVP condition. When the VBUS_CON voltage returns below VOVP – VHYS-OVP, the nFET switch is turned on again after the internal delay of tOVP_Recov. This delay time ensures that the VBUS_CON supply has stabilized before turning the switch back on. After tOVP_Recov, the TPD1S414 turns ON the nFET through a soft start to ensure that the USB Inrush current compliance is met. When the OVP condition is cleared and the nFET is completely turned ON, the ACK is reset LOW. TIMING DIAGRAMS Figure 9. Thermal Shutdown Operation 8 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: TPD1S414 |
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