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參數(shù)資料
| 型號： | TPS54226PW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 封裝： | PACKAGE-14 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 501K |
| 代理商： | TPS54226PW |
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-ShutdownCurrent-
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T -JunctionTemperature-°C
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-SupplyCurrent-
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SLVSA14B – OCTOBER 2009 – REVISED JUNE 2010
www.ti.com
Current Protection
Output current is limited by cycle-by-cycle overcurrent limiting control. The inductor current is monitored during
the OFF state and the controller keeps the OFF state when the inductor current is larger than the over current
trip level. To provide both good accuracy and cost effective solution, the device supports temperature
compensated internal MOSFET RDS(on) sensing.
The inductor current is monitored by the voltage between PGND pin and SW1/SW2 pin. In an overcurrent
condition, the current to the load exceeds the current to the output capacitor; thus, the output voltage tends to fall
off. Eventually, it will end up with crossing the undervoltage protection threshold and shutdown.
Over/Under Voltage Protection
The TPS54226 detects over and undervoltage conditions by monitoring the feedback voltage (VFB). This
function is enabled after approximately 1.7 times the soft-start time. When the feedback voltage becomes higher
than 120% of the target voltage, the OVP comparator output goes high and the circuit latches the high-side
MOSFET driver turns off and the low-side MOSFET turns on. When the feedback voltage becomes lower than
70% of the target voltage, the UVP comparator output goes high and an internal UVP delay counter begins. After
250 ms, the device latches off both internal top and bottom MOSFET.
UVLO Protection
Undervoltage lock out protection (UVLO) monitors the voltage of the VREG5 pin. When the VREG5 voltage is lower
than UVLO threshold voltage, the TPS54226 is shut off. This is protection is non-latching.
Thermal Shutdown
Thermal protection is self-activating. If the junction temperature exceeds the threshold value (typically 150°C),
the TPS54226 shuts off. This protection is non-latching.
TYPICAL CHARACTERISTICS
Figure 1. VCC CURRENT vs JUNCTION TEMPERATURE
Figure 2. VCC SHUTDOWN CURRENT vs JUNCTION
TEMPERATURE
8
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54226
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| TPS54226PWP | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4.5-18V 2A Sync 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54226PWP | 制造商:Texas Instruments 功能描述:DC/DC STEP DOWN CONVERTER IC 700kHz HT 制造商:Texas Instruments 功能描述:IC, SYNC STEP-DOWN DC/DC CONV, HTSSOP-14 |
| TPS54226PWPR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4.5-18V 2A Sync 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54226RGTR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 4.5-18V Inp,2A Synch Step Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| TPS54226RGTT | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 4.5-18V Inp,2A Synch Step Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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