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參數(shù)資料
| 型號(hào)： | TPS51461RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件頁數(shù)： | 9/31頁 |
| 文件大?。?/td> | 1627K |
| 代理商： | TPS51461RGET |
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www.ti.com
SLUSAD9 – DECEMBER 2010
Output Overvoltage Protection (OVP)
In addition to the power good function described above, the TPS51461 has additional OVP and UVP thresholds
and protection circuits.
An OVP condition is detected when the output voltage is approximately 120% × VSLEW. In this case, the
converter de-asserts the PGOOD signals and performs the overvoltage protection function. The converter
remains in this state until the device is reset by cycling 5 V until the 5-V POR threshold (2.3 V nominal) is
reached.
Output Undervoltage Protection (UVP)
Output undervoltage protection works in conjunction with the current protection described in the Overcurrent
Protection and Overcurrent Limit sections. If the output voltage drops below 70% of VSLEW, after an 8-s delay,
the device latches OFF. Undervoltage protection can be reset only by EN or a 5-V POR.
Overcurrent Protection
Both positive and negative overcurrent protection are provided in the TPS51461:
Overcurrent Limit (OCL)
Negative OCL (level same as positive OCL)
Overcurrent Limit
If the sensed current value is above the OCL setting, the converter delays the next ON pulse until the current
drops below the OCL limit. Current limiting occurs on a pulse-by-pulse basis. The TPS51461 uses a valley
current limiting scheme where the DC OCL trip point is the OCL limit plus half of the inductor ripple current. The
minimum valley OCL is 6 A over process and temperature.
During the overcurrent protection event, the output voltage likely droops until the UVP limit is reached. Then, the
converter de-asserts the PGOOD pin, and then latches OFF after an 8-s delay. The converter remains in this
state until the device is reset by EN or a 5VFILT POR.
(6)
Negative OCL
The negative OCL circuit acts when the converter is sinking current from the output capacitor(s). The converter
continues to act in a valley mode, the absolute value of the negative OCL set point is typically -6.5 A.
Thermal Protection
Thermal Shutdown
The TPS51461 has an internal temperature sensor. When the temperature reaches a nominal 130°C, the device
shuts down until the temperature cools by approximately 10°C. Then the converter restarts.
Copyright 2010, Texas Instruments Incorporated
17
Product Folder Link(s): TPS51461
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相關(guān)代理商/技術(shù)參數(shù) |
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| TPS51462 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3-V/5-V Input, D-CAPa?￠ Mode Synchronous Step-Down Integrated FETs Converter With 2-Bit VID |
| TPS51462RGER | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS51462RGET | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS51463 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3-V/5-V Input, D-CAP+? Mode Synchronous Step-Down Integrated FETs Converter |
| TPS51463RGER | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3V/5Vin,Sync SD Integr FET 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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