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參數(shù)資料
| 型號(hào)： | TPS2541RTET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | GREEN, PLASTIC, WQFN-16 |
| 文件頁數(shù)： | 19/37頁 |
| 文件大小： | 999K |
| 代理商： | TPS2541RTET |
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SHORT
ILIMx
48000
I
R
=
SLVSAG2A
– OCTOBER 2010 – REVISED APRIL 2011
Current-Limit Thresholds
The TPS2540/40A/41 has two independent current-limit thresholds that are each programmed externally with a
resistor. The following equation programs the typical current-limit threshold:
(3)
where ISHORT is in mA and RILIMx is in kΩ. 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 in end equipment that may require a lower setting when powered from
batteries vs. wall adapters.
FAULT Response
The FAULT open-drain output is asserted (active low) during an over-temperature or current limit condition. The
output remains asserted until the fault condition is removed. The TPS2540/40A/41 is designed to eliminate false
FAULT reporting by using an internal deglitch circuit for current limit conditions without the need for external
circuitry. This ensures that FAULT is not accidentally asserted due to normal operation such as starting into a
heavy capacitive load. Over-temperature conditions are not deglitched and assert the FAULT signal immediately.
Undervoltage Lockout (UVLO)
The undervoltage lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO
turn-on threshold. Built-in hysteresis prevents unwanted oscillations on the output due to input voltage drop from
large current surges.
Thermal Sense
The TPS2540/40A/41 protects itself with two independent thermal sensing circuits that monitor the operating
temperature of the power distribution switch and disables operation if the temperature exceeds recommended
operating conditions. The device operates in constant-current mode during an over-current condition, which
increases the voltage drop across power switch. The power dissipation in the package is proportional to the
voltage drop across the power switch, so the junction temperature rises during an over-current condition. The
first thermal sensor turns off the power switch when the die temperature exceeds 135
°C and the part is in current
limit. The second thermal sensor turns off the power switch when the die temperature exceeds 155
°C regardless
of whether the power switch is in current limit. Hysteresis is built into both thermal sensors, and the switch turns
on after the device has cooled by approximately 10
°C. The switch continues to cycle off and on until the fault is
removed. The open-drain false reporting output FAULT is asserted (active low) during an over-temperature
shutdown condition.
26
Copyright
2010–2011, Texas Instruments Incorporated
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