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參數(shù)資料
| 型號： | TPS2554DRCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | PLASTIC, SON-10 |
| 文件頁數(shù)： | 3/23頁 |
| 文件大?。?/td> | 1035K |
| 代理商： | TPS2554DRCT |
SHORT
ILIMx
48000
I
R
=
SLVSAM0
– JUNE 2011
DETAILED DESCRIPTION
Overview
The TPS2554/55 is a current-limited, power-distribution switch using an internal N-channel MOSFET as a switch
for applications where short circuits or heavy-capacitive loads will be encountered. This device allows the user to
program two independent current-limit thresholds between 500 mA and 2.5 A (typ) via two external resistors. The
ILIM_SEL pin allows the user to select one current limit or the other. This device incorporates an internal charge
pump and the gate-drive circuitry necessary to drive the N-channel MOSFET. The charge pump supplies power
to the driver circuit and provides the necessary voltage to pull the gate of the MOSFET above the source. The
driver controls the gate voltage of the power switch. The TPS2554/55 family limits the output current to the
programmed current-limit threshold ILIM0 or ILIM1 during an overcurrent or short-circuit event by reducing the
charge-pump voltage driving the N-channel MOSFET and operating it in the linear range of operation. This
necessarily results in a reduction in the output voltage at OUT. Exposure to an overload condition leads directly
to heat dissipation in the internal MOSFET. The MOSFET is protected thermally such that it will shut off when it
gets too hot. The TPS2554/55 will automatically restart following cooling of the device.
Overcurrent Conditions
The TPS2554/55 responds to overcurrent conditions by limiting the output current to the short-circuit current set
by RILIM0 or RILIM1, whichever is selected at the ILIM_SEL pin. When an overcurrent condition is detected the
device maintains a constant output current, and the output voltage reduces accordingly. Two possible overload
conditions can occur.
The first condition is when a short circuit or partial short circuit is present when the device is powered-up or
enabled. The output voltage is held near zero potential with respect to ground and the TPS2554/55 ramps the
output current to the selected output current, ILIM0 or ILIM1. The TPS2554/55 will limit the current to the selected
limit until the overload condition is removed or heating of the internal MOSFET forces a shutdown. (Following
thermal shutdown the TPS2554/55 cools and another start-up attempt occurs automatically.)
The second condition is when a short circuit, partial short circuit, or transient overload occurs while the device is
enabled and powered on. In response to the load transient the output current will typically overshoot the selected
current limit during tIOS as the TPS2554/55 turns off the pass device. Then, the current-sense amplifier will
recover and the output current will be maintained at the selected current limit. As in the previous case, the
TPS2554/55 will maintain the current limit until the overload condition is removed or the device begins to thermal
cycle.
The TPS2554/55 thermal cycles if an overload condition is present long enough to activate thermal limiting in any
of the above cases. The device turns off when the junction temperature exceeds 135
°C (min) while in current
limit. The device remains off until the junction temperature cools 20
°C (typ) and then restarts. The TPS2554/55
cycles on/off until the overload is removed.
Current-Limit Thresholds
The TPS2554/5 has two independent current-limit thresholds that are each programmed externally with a
resistor. The following equation programs the typical current-limit threshold:
where
ISHORT = Current-limit threshold, mA
RILIM = Resistance at ILIMx pin, kΩ
(1)
RILIMx corresponds to RILIM0 when ILIM_SEL is logic LO and to RILIM1 when ILIM_SEL is logic HI. The ILIM_SEL
pin allows the system to digitally select between two current-limit thresholds, which is useful, for example, in end
equipment that may require a lower setting when powered from batteries versus wall adapters.
Copyright
2011, Texas Instruments Incorporated
11
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