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參數資料
| 型號： | TPS54331DG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 684 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 3/27頁 |
| 文件大小： | 794K |
| 代理商： | TPS54331DG4 |
第1頁第2頁當前第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁
REF
OUT
REF
R5
V
R6 =
V
-
OUT
REF
R5
V
= V
+1
R6
é
ù
ê
ú
(
)
OUT(MAX)
IN
OUT(MAX)
MAX
BULK
SW
I
0.25
V
=
+ I
ESR
C
f
D
2
OUT(MAX)
CIN
I
=
www.ti.com
SLVS839C – JULY 2008 – REVISED MARCH 2010
OUTPUT VOLTAGE SET POINT
The output voltage of the TPS54331 is externally adjustable using a resistor divider network. In the application
circuit of Figure 13, this divider network is comprised of R5 and R6. The relationship of the output voltage to the
resistor divider is given by Equation 4 and Equation 5:
(4)
(5)
Choose R5 to be approximately 10.0 k
. Slightly increasing or decreasing R5 can result in closer output voltage
matching when using standard value resistors. In this design, R4 = 10.2 k
and R = 3.24 k, resulting in a 3.31
V output voltage. The zero ohm resistor R4 is provided as a convenient place to break the control loop for
stability testing.
INPUT CAPACITORS
The TPS54331 requires an input decoupling capacitor and depending on the application, a bulk input capacitor.
The typical recommended value for the decoupling capacitor is 10 mF. A high-quality ceramic type X5R or X7R is
recommended. The voltage rating should be greater than the maximum input voltage. A smaller value may be
used as long as all other requirements are met; however 10 mF has been shown to work well in a wide variety of
circuits. Additionally, some bulk capacitance may be needed, especially if the TPS54331 circuit is not located
within about 2 inches from the input voltage source. The value for this capacitor is not critical but should be rated
to handle the maximum input voltage including ripple voltage, and should filter the output so that input ripple
voltage is acceptable. For this design two 4.7 mF capacitors are used for the input decoupling capacitor. They are
X7R dielectric rated for 50 V. The equivalent series resistance (ESR) is approximately 2m
, and the current
rating is 3 A. Additionally, a small 0.01 mF capacitor is included for high frequency filtering.
This input ripple voltage can be approximated by Equation 6
(6)
Where IOUT(MAX) is the maximum load current, fSW is the switching frequency, CBULK is the bulk capacitor value
and ESRMAX is the maximum series resistance of the bulk capacitor.
The maximum RMS ripple current also needs to be checked. For worst case conditions, this can be
approximated by Equation 7
(7)
In this case, the input ripple voltage would be 143 mV and the RMS ripple current would be 1.5 A. It is also
important to note that the actual input voltage ripple will be greatly affected by parasitics associated with the
layout and the output impedance of the voltage source. The actual input voltage ripple for this circuit is shown in
Design Parameters and is larger than the calculated value. This measured value is still below the specified input
limit of 300 mV. The maximum voltage across the input capacitors would be VIN max plus
ΔVIN/2. The chosen
bulk and bypass capacitors are each rated for 50 V and the ripple current capacity is greater than 3 A, both
providing ample margin. It is very important that the maximum ratings for voltage and current are not exceeded
under any circumstance.
OUTPUT FILTER COMPONENTS
Two components need to be selected for the output filter, L1 and C2. Since the TPS54331 is an externally
compensated device, a wide range of filter component types and values can be supported.
Inductor Selection
To calculate the minimum value of the output inductor, use Equation 8
Copyright 2008–2010, Texas Instruments Incorporated
11
Product Folder Link(s): TPS54331
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| TPS54331DR | 功能描述:直流/直流開關轉換器 3A 28V In Step Down SWIFT DC/DC Cnvrtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TPS54331DRG4 | 功能描述:直流/直流開關轉換器 26V,3A DC-DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TPS54331DR-P | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| TPS54331EVM-232 | 功能描述:電源管理IC開發工具 SWIFT Cnvrtr 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 |
| TPS54331EVM-232 | 制造商:Texas Instruments 功能描述:DEVELOPMENT TOOL |
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