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參數(shù)資料
| 型號： | TPS54260DGQR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | GREEN, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 26/49頁 |
| 文件大小： | 1808K |
| 代理商： | TPS54260DGQR |
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(
)
Vin min
Vout
Icirms = Iout
Vin min
-
Iout max
0.25
Vin =
Cin
sw
SLVSA86A – MARCH 2010 – REVISED DECEMBER 2010
www.ti.com
Input Capacitor
The TPS54260 requires a high quality ceramic, type X5R or X7R, input decoupling capacitor of at least 3 mF of
effective capacitance and in some applications a bulk capacitance. The effective capacitance includes any dc
bias effects. The voltage rating of the input capacitor must be greater than the maximum input voltage. The
capacitor must also have a ripple current rating greater than the maximum input current ripple of the TPS54260.
The input ripple current can be calculated using Equation 38.
The value of a ceramic capacitor varies significantly over temperature and the amount of dc bias applied to the
capacitor. The capacitance variations due to temperature can be minimized by selecting a dielectric material that
is stable over temperature. X5R and X7R ceramic dielectrics are usually selected for power regulator capacitors
because they have a high capacitance to volume ratio and are fairly stable over temperature. The output
capacitor must also be selected with the dc bias taken into account. The capacitance value of a capacitor
decreases as the dc bias across a capacitor increases.
For this example design, a ceramic capacitor with at least a 60V voltage rating is required to support the
maximum input voltage. Common standard ceramic capacitor voltage ratings include 4V, 6.3V, 10V, 16V, 25V,
50V or 100V so a 100V capacitor should be selected. For this example, two 2.2mF, 100V capacitors in parallel
have been selected. Table 2 shows a selection of high voltage capacitors. The input capacitance value
determines the input ripple voltage of the regulator. The input voltage ripple can be calculated using Equation 39.
Using the design example values, Ioutmax = 2.5 A, Cin = 4.4mF, sw = 300 kHz, yields an input voltage ripple of
206 mV and a rms input ripple current of 1.15 A.
(38)
(39)
Table 2. Capacitor Types
VENDOR
VALUE (mF)
EIA Size
VOLTAGE
DIALECTRIC
COMMENTS
1.0 to 2.2
100 V
1210
GRM32 series
1.0 to 4.7
50 V
Murata
1.0
100 V
1206
GRM31 series
1.0 to 2.2
50 V
1.0 10 1.8
50 V
2220
1.0 to 1.2
100 V
Vishay
VJ X7R series
1.0 to 3.9
50 V
2225
1.0 to 1.8
100 V
X7R
1.0 to 2.2
100 V
1812
C series C4532
1.5 to 6.8
50 V
TDK
1.0. to 2.2
100 V
1210
C series C3225
1.0 to 3.3
50 V
1.0 to 4.7
50 V
1210
1.0
100 V
AVX
X7R dielectric series
1.0 to 4.7
50 V
1812
1.0 to 2.2
100 V
Slow Start Capacitor
The slow start capacitor determines the minimum amount of time it will take for the output voltage to reach its
nominal programmed value during power up. This is useful if a load requires a controlled voltage slew rate. This
is also used if the output capacitance is large and would require large amounts of current to quickly charge the
capacitor to the output voltage level. The large currents necessary to charge the capacitor may make the
TPS54260 reach the current limit or excessive current draw from the input power supply may cause the input
voltage rail to sag. Limiting the output voltage slew rate solves both of these problems.
32
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54260
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| TPS54260DRCT | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.5V-60Vin,2.5A,2.5 MHz Step Down SWIFT RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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| TPS54260MDGQTEP | 功能描述:IC REG BUCK ADJ 2.5A 10MOSP 制造商:texas instruments 系列:Eco-Mode? 包裝:剪切帶（CT） 零件狀態(tài):在售 功能:降壓 輸出配置:正 拓撲:降壓 輸出類型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:3.5V 電壓 - 輸入（最大值）:60V 電壓 - 輸出（最小值/固定）:0.8V 電壓 - 輸出（最大值）:60V 電流 - 輸出:2.5A 頻率 - 開關(guān):100kHz ~ 2.5MHz 同步整流器:無 工作溫度:-40°C ~ 150°C（TJ） 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 供應(yīng)商器件封裝:10-MSOP-PowerPad 標準包裝:1 |
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