參數(shù)資料
型號(hào)： TPS24711DGSR
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, PDSO10
封裝： GREEN, PLASTIC, MSOP-10
文件頁數(shù)： 34/34頁
文件大?。?/td> 2148K
代理商： TPS24711DGSR
J(MAX)
C(MAX)
LIM
θJC(MAX)
T
P
<
R
-
LIM
SENSE
25 mV
I
=
R
T
FLT
10 A
C =
t
1.35 V
SLVSAL2C
– JANUARY 2011 – REVISED MAY 2011
(2)
where TJ(MAX) is the maximum desired transient junction temperature and TC(MAX) is the maximum case
temperature prior to a start or restart. RJC(MAX) is the junction-to-case thermal impedance of the pass MOSFET
M1 in units of °C/W. Both TJ(MAX) and TC(MAX) are in °C.
SENSE: This pin connects to the negative terminal of RSENSE. 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
ILIM is set by Equation 3.
(3)
A fast trip shutdown occurs when V(VCC – VSENSE) exceeds 60 mV.
TIMER: A capacitor CT connected from the TIMER pin to GND determines the overload fault timing. TIMER
sources 10
A when an overload is present, and discharges CT at 10 A otherwise. M1 is turned off when VTIMER
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 CT can be calculated from the desired fault time tFLT, using
(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
16th cycle of charging and discharging. The external MOSFET is then re-enabled. The TIMER pin capacitor, CT,
can also be discharged to GND during latch mode or retry mode by a 2-mA current source whenever any of the
following occurs:
VEN is below its falling threshold.
VVCC 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 RSENSE to minimize the voltage sensing error.
Bypass capacitor C1, shown in the typical application diagram on the front page, should be connected to the
positive terminal of RSENSE. A capacitance of at least 10 nF is recommended.
Copyright
2011, Texas Instruments Incorporated
9
Product Folder Link(s): TPS24710 TPS24711 TPS24712 TPS24713
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