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參數(shù)資料
| 型號： | LTC3127EMSE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO12 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-12 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 366K |
| 代理商： | LTC3127EMSE#TRPBF |
LTC3127
3127f
applicaTions inForMaTion
Capacitor Selection Example
In this example, a pulsed load application requires that
VOUT droops less than 300mV. The application is a Li-Ion
battery input to a 3.6V output. The pulsed load is a no-load
to a 1.5A step with a frequency of 217Hz and a duty cycle
of 12.5%. The input current limit is set to 500mA. In order
to meet the 300mV droop requirement, the amount of
capacitance must be calculated at the highest VIN to VOUT
step-up ratio. All of the following calculations assume a
minimum VIN of 3V and an efficiency of 90%.
Given the application, the following is known:
VIN = 3V
VOUT = 3.6V
IIN(MAX) = 500mA
IPULSE = 1.5A
ISTANDBY = 0A
h = 0.9
D = 0.125
T = 1/217Hz = 4.6ms
VDROOP = 300mV
Step 1: Check to make sure the application can provide
enough current to recover from the pulsed load using the
ILOAD(MAX) equation:
I
V
mA
V
A
LOAD MAX
(
)
.
.
.
=
3
500
0 9
0 125 3 6
3
The maximum load that can be pulsed at this VIN to VOUT
combination is 3A.
Step 2: Calculate the minimum output capacitance re-
quired.
C
A
V
mA
V
OUT MIN
(
)
.
.
.
.
≥
1 5
3
500
0 9
3 6
0 125 .
.
4 6
300
2 15
ms
mV
mF
=
Step 3: For this application a 2.2mF Vishay Tantamount
tantalum,lowESRcapacitorisselected.Thiscapacitorhas
a maximum ESR of 0.04Ω. With the selected capacitor,
the amount of droop must be calculated:
V
A
V
mA
V
A
DROOP LOAD
_
.
.
.
=
1 5
3
500
0 9
3 6
0
=
.
.
_
0 125 4 6
2 2
0 294
1
ms
mF
V
VDROOP ESR
55
3
500
0 9
3 6
0
0 04
0
A
V
mA
V
A
=
.
.
.
..
.
_
045
0 339
V
DROOP
DROOP LOAD
DROOP ESR
=
+
=
Due to the ESR of the capacitor, the total droop is greater
than 300mV. In this case, if the higher droop cannot be
accepted, a larger valued, lower ESR capacitor can be
selected.
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相關(guān)代理商/技術(shù)參數(shù) |
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| LTC3129 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3??A Quiescent Current |
| LTC3129-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3??A Quiescent Current |
| LTC3129EMSE#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down/Step Up 1.92V to 15V 16-Pin MSOP EP 制造商:Linear Technology 功能描述:IC REG BUCK BST ADJ 0.2A 16MSOP 制造商:Linear Technology 功能描述:DC-DC CONV, BUCK/BOOST, ADJ, 1.2MHZ, MSOP-16; Primary Input Voltage:15V; No. of Outputs:1; Output Current:200mA; No. of Pins:16; Operating Temperature Min:-40C; Operating Temperature Max:125C; Package / Case:16-MSOP ;RoHS Compliant: Yes |
| LTC3129EMSE#TRPBF | 制造商:Linear Technology 功能描述:IC REG BUCK BST ADJ 0.2A 16MSOP 制造商:Linear Technology 功能描述:DC-DC CONV, BUCK/BOOST, ADJ, 1.2MHZ, MSOP-16; Primary Input Voltage:15V; No. of Outputs:1; Output Current:200mA; No. of Pins:16; Operating Temperature Min:-40C; Operating Temperature Max:125C; Package / Case:16-MSOP ;RoHS Compliant: Yes |
| LTC3129EMSE-1#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down/Step Up 1.92V to 15V 16-Pin MSOP EP 制造商:Linear Technology 功能描述:IC REG BUCK BST FIXED .2A 16MSOP 制造商:Linear Technology 功能描述:DC-DC CONV, BUCK/BOOST, ADJ, 1.2MHZ, MSOP-16; Primary Input Voltage:15V; No. of Outputs:1; Output Current:200mA; No. of Pins:16; Operating Temperature Min:-40C; Operating Temperature Max:125C 制造商:Linear Technology 功能描述:DC-DC CONV, BUCK/BOOST, ADJ, 1.2MHZ, MSOP-16; Primary Input Voltage:15V; No. of Outputs:1; Output Current:200mA; No. of Pins:16; Operating Temperature Min:-40C; Operating Temperature Max:125C; Package / Case:16-MSOP ;RoHS Compliant: Yes |
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