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參數(shù)資料
| 型號(hào)： | TPS54318RTET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5.5 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, PLASTIC, QFN-16 |
| 文件頁數(shù)： | 5/36頁 |
| 文件大?。?/td> | 1388K |
| 代理商： | TPS54318RTET |
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-
×
-
START
STOP
6
0.944 V
V
R1 =
2.59
10
-
×
-
+
×
6
STOP
1.18 R1
R2 =
V
1.18
R1 3.2
10
SS
ref
T
(mS)
I
( A)
C
(nF) =
V
(V)
m
SS
TPS54318
EN
PWRGD
SS
EN
PWRGD
EN1=2V/div
PWRGD1=2V/div
Vout1=1/div
Vout2=1V/div
Time=5msec/div
www.ti.com ......................................................................................................................................................................................... SLVS975 – SEPTEMBER 2009
(2)
(3)
SLOW START PIN
The TPS54318 regulates to the lower of the SS pin and the internal reference voltage. A capacitor on the SS pin
to ground implements a slow start time. The TPS54318 has an internal pull-up current source of 1.8
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 1.8 μA, and Vref is the internal
voltage reference of 0.8 V.
(4)
If during normal operation, the VIN goes below the UVLO, EN pin pulled below 1.2 V, or a thermal shutdown
event occurs, the TPS54318 stops switching and the SS 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, 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 24 shows the sequential method. The power good is coupled to the EN pin on the
TPS54318 which enables the second power supply once the primary supply reaches regulation.
Ratiometric start up can be accomplished by connecting the SS 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 ratiometric method is illustrated in Figure 26.
Figure 24. Sequential Start-Up Sequence
Figure 25. Sequential Startup using EN and
PWRGD
Copyright 2009, Texas Instruments Incorporated
13
Product Folder Link(s) :TPS54318
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS54318RTET | 制造商:Texas Instruments 功能描述:Voltage Regulator IC 制造商:Texas Instruments 功能描述:IC, SYNC STEP-DOWN SWITCHER, QFN-16 |
| TPS54319 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down Switcher With Integrated FETs ( SWIFTa?￠) |
| TPS54319_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down Switcher With Integrated FETs ( SWIFTa?￠) |
| TPS54319EVM-626 | 功能描述:電源管理IC開發(fā)工具 Evaluation Module for TPS54319 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS54319RTE | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down Switcher With Integrated FETs ( SWIFT?) |
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