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參數資料
| 型號： | TPS54519RTER |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, WQFN-16 |
| 文件頁數： | 4/33頁 |
| 文件大?。?/td> | 1269K |
| 代理商： | TPS54519RTER |
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Tss(mS)
Iss( A)
Css(nF) =
Vref(V)
m
SS/TR2
TPS54519
EN2
PWRGD2
SS/TR1
EN1
PWRGD1
TPS54519
Vo u t 2
Vo u t 1
P W R G D 1
E N 2
EN1
SLVSAT3
– SEPTEMBER 2011
SLOW START / TRACKING PIN
The TPS54519 regulates to the lower of the SS/TR pin and the internal reference voltage. A capacitor on the
SS/TR pin to ground implements a slow start time. The TPS54519 has an internal pull-up current source of
2.4
μA which charges the external slow start capacitor. Equation 4 calculates the required slow start capacitor
value where Tss is the desired slow start time in ms, Iss is the internal slow start charging current of 2.4
μA, and
Vref is the internal voltage reference of 0.6 V.
(4)
If during normal operation, the VIN goes below the UVLO, EN pin pulled below 1.18 V, or a thermal shutdown
event occurs, the TPS54519 stops switching and the SS/TR is discharged to 0 volts before reinitiating a
powering up sequence.
SEQUENCING
Many of the common power supply sequencing methods can be implemented using the SS/TR, EN and PWRGD
pins. The sequential method can be implemented using an open drain or collector output of a power on reset pin
of another device. Figure 18 shows the sequential method. The power good is coupled to the EN pin on the
TPS54519 which enables the second power supply once the primary supply reaches regulation.
Ratio-metric start up can be accomplished by connecting the SS/TR pins together. The regulator outputs ramp
up and reach regulation at the same time. When calculating the slow start time the pull up current source must
be doubled in Equation 4. The ratio metric method is illustrated in Figure 20.
Figure 18. Sequential Start-Up Sequence
Figure 19. Sequential Startup using EN and
PWRGD
12
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS54519
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS54519RTET | 功能描述:直流/直流開關調節(jié)器 2.95-6VIN,5A SYNC STEP-DOWN CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54521 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
| TPS54521_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
| TPS54521EVM-607 | 功能描述:電源管理IC開發(fā)工具 TPS54521 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS54521RHL | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
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