TPS24711DGSR【PDF 9/34 页】IC CTRLR HOT SWAP 2.5-18V 10MSOP

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Sheet目录47

5页 6页 7页 8页 [9页]10页 11页 12页 13页

FLT

10 A

?/DIV>

LIM

EN E

25 mV

J(MAX)

C(MAX)

LIM

窲C(MAX)

TPS24710,TPS24711

TPS24712,TPS24713

www.ti.com

SLVSAL2E JANUARY 2011REVISED NOVEMBER 2013

(2)

where T

J(MAX)

is the maximum desired transient junction temperature and T

C(MAX)

is the maximum case

temperature prior to a start or restart. R

鐹C(MAX)

is the junction-to-case thermal impedance of the pass MOSFET

in units of 癈/W. Both T

J(MAX)

and T

C(MAX)

are in 癈.

SENSE: This pin connects to the negative terminal of R

SENSE

. It provides a means of sensing the voltage across

this resistor, as well as a way to monitor the drain-to-source voltage across the external FET. The current limit

LIM

is set by Equation 3.

(3)

A fast trip shutdown occurs when V

(VCC VSENSE)

exceeds 60 mV.

TIMER: A capacitor C

connected from the TIMER pin to GND determines the overload fault timing. TIMER

sources 10 礎 when an overload is present, and discharges C

at 10 礎 otherwise. M

is turned off when V

TIMER

reaches 1.35 V. In an application implementing auto-retry after a fault, this capacitor also determines the period

before the external MOSFET is re-enabled. A minimum timing capacitance of 1 nF is recommended to ensure

proper operation of the fault timer. The value of C

can be calculated from the desired fault time t

FLT

, using

Equation 4.

(4)

The latch mode (TPS24710/12) or the retry mode (TPS24711/13) occurs if the load current exceeds the current

limit threshold or the fast-trip shutdown threshold, While in latch mode, the TIMER pin continues to charge and

discharge the attached capacitor periodically. In retry mode, the external MOSFET is disabled for sixteen cycles

of TIMER charging and discharging. The TIMER pin is pulled to GND by a 2-mA current source at the end of the

cycle of charging and discharging. The external MOSFET is then re-enabled. The TIMER pin capacitor, C

can also be discharged to GND during latch mode or retry mode by a 2-mA current source whenever any of the

following occurs:

" V

is below its falling threshold.

" V

VCC

drops below the UVLO threshold.

VCC: This pin performs three functions. First, it provides biasing power to the integrated circuit. Second, it serves

as an input to the power-on reset (POR) and undervoltage lockout (UVLO) functions. The VCC trace from the

integrated circuit should connect directly to the positive terminal of R

SENSE

to minimize the voltage sensing error.

Bypass capacitor C

, shown in the typical application diagram on the front page, should be connected to the

positive terminal of R

SENSE

. A capacitance of at least 10 nF is recommended.

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