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參數(shù)資料
| 型號： | TPS54319RTER |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, WQFN-16 |
| 文件頁數(shù)： | 8/36頁 |
| 文件大小： | 1271K |
| 代理商： | TPS54319RTER |
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TPS54319
Clock
Source
PLL
R
T
RT/CLK
SYNCClock=2V/div
PH=2V/div
Time=500nsec/div
SLVSA83 – JUNE 2010
www.ti.com
REVERSE OVERCURRENT PROTECTION
The TPS54319 implements low side current protection by detecting the voltage across the low side MOSFET.
When the converter sinks current through its low side FET, the control circuit turns off the low side MOSFET if
the reverse current is typically more than 2 A. By implementing this additional protection scheme, the converter is
able to protect itself from excessive current during power cycling and start-up into pre-biased outputs.
SYNCHRONIZE USING THE RT/CLK PIN
The RT/CLK pin is used to synchronize the converter to an external system clock. See Figure 30. To implement
the synchronization feature in a system, connect a square wave to the RT/CLK pin with an on time of at least
75ns. If the pin is pulled above the PLL upper threshold, a mode change occurs and the pin becomes a
synchronization input. The internal amplifier is disabled and the pin is a high impedance clock input to the
internal PLL. If clocking edges stop, the internal amplifier is re-enabled and the mode returns to the frequency set
by the resistor. The square wave amplitude at this pin must transition lower than 0.6 V and higher than 1.6 V
typically. The synchronization frequency range is 300 kHz to 2000 kHz. The rising edge of the PH is
synchronized to the falling edge of RT/CLK pin.
Figure 30. Synchronizing to a System Clock
Figure 31. Plot of Synchronizing to System Clock
POWER GOOD (PWRGD PIN)
The PWRGD pin output is an open drain MOSFET. The output is pulled low when the VSENSE voltage enters
the fault condition by falling below 91% or rising above 107% of the nominal internal reference voltage. There is
a 2% hysteresis on the threshold voltage, so when the VSENSE voltage rises to the good condition above 93%
or falls below 105% of the internal voltage reference the PWRGD output MOSFET is turned off. It is
recommended to use a pull-up resistor between the values of 1k
and 100k to a voltage source that is 6 V or
less. The PWRGD is in a valid state once the VIN input voltage is greater than 1.2 V.
OVERVOLTAGE TRANSIENT PROTECTION
The TPS54319 incorporates an overvoltage transient protection (OVTP) circuit to minimize voltage overshoot
when recovering from output fault conditions or strong unload transients. The OVTP feature minimizes the output
overshoot by implementing a circuit to compare the VSENSE pin voltage to the OVTP threshold which is 107%
of the internal voltage reference. If the VSENSE pin voltage is greater than the OVTP threshold, the high side
MOSFET is disabled preventing current from flowing to the output and minimizing output overshoot. When the
VSENSE voltage drops lower than the OVTP threshold the high side MOSFET is allowed to turn on the next
clock cycle.
THERMAL SHUTDOWN
The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds 165°C.
The thermal shutdown forces the device to stop switching when the junction temperature exceeds the thermal
trip threshold. Once the die temperature decreases below 150°C, the device reinitiates the power up sequence
by discharging the SS pin to below 40 mV. The thermal shutdown hysteresis is 15°C.
16
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54319
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS54319RTET | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.95-6Vin 3A 2MHz Sync Step-Down SWIFT RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54319RTET | 制造商:Texas Instruments 功能描述:SYNCHRONOUS STEP-DOWN SWITCHER WITH INTE 制造商:Texas Instruments 功能描述:IC, SYNC STEP-DOWN DC/DC CONVERTER QFN16 |
| TPS5431DDA | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5-23V 3A Step Down Swift Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS5431DDAG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5-23V 3A Step Down Swift Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS5431DDAR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5V-23V 3A Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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