TPS22980RGPR datasheet(9/18 Pages) TI1

No. de pieza	TPS22980RGPR

Descripción Electrónicos	3.3V TO 18V MUX with Overcurrent Limit

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Fabricante Electrónico	TI1 [Texas Instruments]

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3.3 V

18 V

HV_EN

HV_UVLO

HV_EN & HV_UVLO

S3P3

SHV

OUT

IDIS

0V

EN

3.3 V

Load

Current

Output

Voltage

t

OC Limit

tLIM delay

TPS22980

www.ti.com

SLVSB61B – DECEMBER 2011 – REVISED APRIL 2012

Figure 8 shows possible combinations of EN and HV_EN controlling OUT of the TPS22980.

Figure 8. Logic Waveforms Displaying the Transition Between VHV and V3P3

OVER-CURRENT LIMIT AND SHORT CIRCUIT PROTECTION

When the load at OUT attempts to draw more current than the limit set by the external RISET resistors for the

V3P3 switch and VHV switch (for both S0 and S3 modes), the device will operate in a constant current mode

while lowering the output voltage. Figure 9 shows the delay, tLIM, which occurs when an over-current fault is

detected until the output current is lowered to ILIMHV tolerances for VHV or ILIM3V3 tolerances for V3P3 as

shown in Figure 4.

Figure 9. Overcurrent Output Response

All short circuit conditions are treated as over-current conditions. In the event of a short circuit, the device will

limit the output current to the corresponding RSET value and continue to do so until thermal shutdown is

encountered or the short circuit condition is removed.

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TPS22980RGPR Datasheet(PDF) 9 Page - Texas Instruments

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