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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)： | 6/36頁 |
| 文件大小： | 1271K |
| 代理商： | TPS54319RTER |
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SS1
Vo u t 2
E N 1 / 2
Vo u t 1
SS/TR1
TPS54319
EN1
PWRGD1
SS/TR2
TPS54319
EN2
PWRGD2
D
Vout2 +
V
Vssoffset
R1 =
Vref
Iss
D
-
Vref
R1
R2 =
Vout2 +
V
Vref
V = Vout1
Vout2
D
-
R1
2930 Vout1 145
V
>
-
D
SLVSA83 – JUNE 2010
www.ti.com
Figure 26. Schematic for Ratio-metric Start-Up
Figure 27. Ratio-metric Startup with Vout1 Leading
Sequence
Vout2
vertical spacer
Ratio-metric and simultaneous power supply sequencing can be implemented by connecting the resistor network
of R1 and R2 shown in Figure 28 to the output of the power supply that needs to be tracked or another voltage
reference source. Using Equation 5 and Equation 6, the tracking resistors can be calculated to initiate the Vout2
slightly before, after or at the same time as Vout1. Equation 7 is the voltage difference between Vout1 and
Vout2. The
ΔV variable is zero volts for simultaneous sequencing. To minimize the effect of the inherent SS/TR
to VSENSE offset (Vssoffset) in the slow start circuit and the offset created by the pullup current source (Iss) and
tracking resistors, the Vssoffset and Iss are included as variables in the equations. To design a ratio-metric start
up in which the Vout2 voltage is slightly greater than the Vout1 voltage when Vout2 reaches regulation, use a
negative number in Equation 5 through Equation 7 for
ΔV. Equation 7 will result in a positive number for
applications which the Vout2 is slightly lower than Vout1 when Vout2 regulation is achieved. Since the SS/TR pin
must be pulled below 40mV before starting after an EN, UVLO or thermal shutdown fault, careful selection of the
tracking resistors is needed to ensure the device will restart after a fault. Make sure the calculated R1 value from
Equation 5 is greater than the value calculated in Equation 8 to ensure the device can recover from a fault. As
the SS/TR voltage becomes more than 85% of the nominal reference voltage the Vssoffset becomes larger as
the slow start circuits gradually handoff the regulation reference to the internal voltage reference. The SS/TR pin
voltage needs to be greater than 1.1 V for a complete handoff to the internal voltage reference as shown in
vertical spacer
(5)
vertical spacer
(6)
vertical spacer
(7)
vertical spacer
(8)
vertical spacer
14
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(fēng)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(fēng)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(fēng)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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