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參數資料
| 型號： | TPS61041DRV |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | LOW-POWER DC/DC BOOST CONVERTER IN SOT-23 AND SON PACKAGES |
| 中文描述： | 低功耗DC / DC升壓轉換器采用SOT - 23和兒子套票 |
| 文件頁數： | 10/22頁 |
| 文件大?。?/td> | 491K |
| 代理商： | TPS61041DRV |
www.ti.com
APPLICATION INFORMATION
INDUCTOR SELECTION, MAXIMUM LOAD CURRENT
Because the PFM peak current control scheme is inherently stable, the inductor value does not affect the stability
of the regulator. The selection of the inductor together with the nominal load current, input and output voltage of
the application determines the switching frequency of the converter. Depending on the application, inductor
values between 2.2
μ
H and 47
μ
H are recommended. The maximum inductor value is determined by the
maximum on time of the switch, typically 6
μ
s. The peak current limit of 400 mA/250 mA (typically) should be
reached within this 6-
μ
s period for proper operation.
fSmax
VIN(min)
(VOUT
VOUT
VIN)
IP
L
(2)
fS Iload
2
Iload
(VOUT
I
2
P
VIN
Vd)
L
(3)
Iload max
I
2
P
2
L
fSmax
VIN)
(VOUT
(4)
TPS61040
TPS61041
SLVS413C–OCTOBER 2002–REVISED AUGUST 2007
The inductor value determines the maximum switching frequency of the converter. Therefore, select the inductor
value that ensures the maximum switching frequency at the converter maximum load current is not exceeded.
The maximum switching frequency is calculated by the following formula:
Where:
I
P
= Peak current as described in the
Peak Current Control
section
L = Selected inductor value
V
IN(min)
= The highest switching frequency occurs at the minimum input voltage
If the selected inductor value does not exceed the maximum switching frequency of the converter, the next step
is to calculate the switching frequency at the nominal load current using the following formula:
Where:
I
P
= Peak current as described in the
Peak Current Control
section
L = Selected inductor value
I
load
= Nominal load current
Vd = Rectifier diode forward voltage (typically 0.3V)
A smaller inductor value gives a higher converter switching frequency, but lowers the efficiency.
The inductor value has less effect on the maximum available load current and is only of secondary order. The
best way to calculate the maximum available load current under certain operating conditions is to estimate the
expected converter efficiency at the maximum load current. This number can be taken out of the efficiency
graphs shown in
Figure 1
through
Figure 4
. The maximum load current can then be estimated as follows:
Where:
I
P
= Peak current as described in the
Peak Current Control
section
L = Selected inductor value
fS
max
= Maximum switching frequency as calculated previously
η
= Expected converter efficiency. Typically 70% to 85%
10
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Copyright 2002–2007, Texas Instruments Incorporated
Product Folder Link(s):
TPS61040 TPS61041
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS61041DRVR | 功能描述:LED照明驅動器 28V 250-mA Sw Boost Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61041DRVRG4 | 功能描述:LED照明驅動器 28V 250-mA Sw Boost Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61041DRVT | 功能描述:LED照明驅動器 28V 250mA Sw Boost Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61041DRVTG4 | 功能描述:LED照明驅動器 28V 250-mA Sw Boost Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61041-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW POWER DC/DC BOOST CONVERTER IN SOT-23 PACKAGE |
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