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TPD1S414 Scheda tecnica(PDF) 8 Page - Texas Instruments

Il numero della parte TPD1S414
Spiegazioni elettronici  USB CHARGER OVP SWITCH WITH ESD FOR V
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPD1S414 Scheda tecnica(HTML) 8 Page - Texas Instruments

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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
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Copyright © 2013, Texas Instruments Incorporated
Product Folder Links: TPD1S414


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