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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)： | 4/23頁 |
| 文件大?。?/td> | 1035K |
| 代理商： | TPS2554DRCT |
SLVSAM0
– JUNE 2011
FAULT Response
The FAULT open-drain output is asserted low during an overcurrent or over-temperature condition. The
TPS2554/55 asserts the FAULT signal until the fault condition is removed and the device resumes normal
operation. The TPS2554/55 is designed to eliminate false FAULT reporting by using an internal delay "deglitch"
circuit for overcurrent conditions (9 ms typical) 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. The deglitch
circuitry delays entering and leaving current-limit-induced fault conditions. The FAULT signal is not deglitched
when the MOSFET is disabled due to an over-temperature condition, but it is deglitched after the device has
cooled and begins to turn on. This unidirectional deglitch feature prevents FAULT oscillation during an
over-temperature event.
Undervoltage Lockout (UVLO)
The Undervoltage Lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO
turn-on threshold (4.1 V, nominal). Built-in hysteresis prevents unwanted on/off cycling due to input-voltage droop
during turn on.
Enable (EN OR EN )
The logic enable controls the power switch and device supply current. The supply current is reduced to less than
3.8
μA when a logic low is present on EN (TPS2554) or when a logic high is present on EN (TPS2555). A logic
high input on EN or a logic low input on EN enables the driver, control circuits, and power switch. The enable
input is compatible with both TTL and CMOS logic levels.
Output Discharge
When the output is disabled through either the EN (TPS2554) or EN (TPS2555) pin or by an over-temperature
shutdown the OUT pin is discharged internally through a MOSFET. Nominal MOSFET resistance (RDIS) is 500 Ω.
Thermal Sense
The TPS2554/55 self protects by using two independent thermal-sensing circuits that monitor the operating
temperature of the power switch and will disable operation if the temperature exceeds recommended operating
conditions. The TPS2554/55 device operates in constant-current mode during an overcurrent condition thereby
increasing the voltage drop across the MOSFET power switch. The power dissipation in the package increases
with the voltage drop across the power switch, thereby causing the junction temperature to rise during an
overcurrent condition. The first thermal sensor turns off the power switch when the die temperature exceeds
135
°C (min) and the part is in current limit. Hysteresis is built into the thermal sensor, and the switch turns on
after the device has cooled approximately 20
°C. The TPS2554/55 continues to cycle off and on until the fault is
removed.
The TPS2554/55 also has a second ambient thermal sensor. The ambient thermal sensor turns off the power
switch when the die temperature exceeds 155
°C (min) regardless of whether the power switch is in current limit
and will turn on the power switch back on after the device has cooled approximately 20
°C. The TPS2554/55 will
continue to cycle off and on until the fault is removed.
12
Copyright
2011, Texas Instruments Incorporated
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