參數(shù)資料
型號(hào)： TPS54332DDAR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO8
封裝： PLASTIC, SOIC-8
文件頁(yè)數(shù)： 3/26頁(yè)
文件大?。?/td> 986K
代理商： TPS54332DDAR
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
=
(
)
0.8
-
OUT(MAX)
IN(MAX)
OUT
MIN
IN(MAX)
IND
OUT
SW
V
L
=
V
K
I
F
www.ti.com
SLVS875A – JANUARY 2009 – REVISED MARCH 2010
OUTPUT VOLTAGE SET POINT
The output voltage of the TPS54332 is externally adjustable using a resistor divider network. In the application
circuit of Figure 12, 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 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 = 4.75 k, resulting in a 2.5 V
output voltage.
INPUT CAPACITORS
The TPS54332 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 TPS54332 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 a single 10 mF capacitor is used for the input decoupling capacitor. It is
X5R dielectric rated for 25 V. The equivalent series resistance (ESR) is approximately 3 m
, and the current
rating is 3 A.
This input ripple voltage can be approximated by Equation 6
(6)
Where IOUT(MAX) is the maximum load current, fSW is the switching frequency (derated by a factor of 0.8), 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 98 mV and the RMS ripple current would be 1.75 A. It is also
important to note that the actual input voltage ripple will be greatly affected by parasitic 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
200 mV. The maximum voltage across the input capacitors would be VIN max plus
ΔVIN/2. The chosen bypass
capacitor is rated for 25 V and the ripple current capacity is greater than 3 A, providing ample margin. It is
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, the output inductor L1 and the output capacitance.
Since the TPS54332 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
(8)
Copyright 2009–2010, Texas Instruments Incorporated
11
Product Folder Link(s): TPS54332
相關(guān)PDF資料
PDF描述
TPS54350PWPR 6.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO16
TPS54350PWP 6.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO16
TPS54355PWPRG4 6.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO16
TPS54353PWPR 6.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO16
TPS54356PWPG4 6.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS54332EVM-416 功能描述:電源管理IC開(kāi)發(fā)工具 5-15V,3A,SWIFT Buck Converter Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS54334DDA 功能描述:Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 3A 8-PowerSOIC (0.154", 3.90mm Width) 制造商:texas instruments 系列:- 包裝:管件 零件狀態(tài):有效 功能:降壓 輸出配置:正 拓?fù)?降壓 輸出類(lèi)型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:4.2V 電壓 - 輸入（最大值）:28V 電壓 - 輸出（最小值/固定）:0.8V 電壓 - 輸出（最大值）:24V 電流 - 輸出:3A 頻率 - 開(kāi)關(guān):570kHz 同步整流器:是 工作溫度:-40°C ~ 150°C（TJ） 安裝類(lèi)型:表面貼裝 封裝/外殼:8-PowerSOIC（0.154"，3.90mm 寬） 供應(yīng)商器件封裝:8-SO PowerPad 標(biāo)準(zhǔn)包裝:75
TPS54334DDAR 功能描述:IC REG BUCK ADJ 3A SYNC PWR8SO 制造商:texas instruments 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1
TPS54334DRCT 功能描述:Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 3A 10-VFDFN Exposed Pad 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 功能:降壓 輸出配置:正 拓?fù)?降壓 輸出類(lèi)型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:4.2V 電壓 - 輸入（最大值）:28V 電壓 - 輸出（最小值/固定）:0.8V 電壓 - 輸出（最大值）:24V 電流 - 輸出:3A 頻率 - 開(kāi)關(guān):570kHz 同步整流器:是 工作溫度:-40°C ~ 85°C（TA） 安裝類(lèi)型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤(pán) 供應(yīng)商器件封裝:10-VSON（3x3） 標(biāo)準(zhǔn)包裝:1
TPS54334EVM-722 功能描述:TPS54334 SWIFT? DC/DC, Step Down 1, Non-Isolated Outputs Evaluation Board 制造商:texas instruments 系列:SWIFT?? 零件狀態(tài):有效 主要用途:DC/DC，步降 輸出和類(lèi)型:1，非隔離 功率 - 輸出:- 電壓 - 輸出:3.3V 電流 - 輸出:3A 電壓 - 輸入:4.2 V ~ 28 V 穩(wěn)壓器拓?fù)?降壓 頻率 - 開(kāi)關(guān):570kHz 板類(lèi)型:完全填充 所含物品:板 使用的 IC/零件:TPS54334 標(biāo)準(zhǔn)包裝:1
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*