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參數(shù)資料
| 型號(hào)： | TPS61045DRB |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DIGITALLY ADJUSTABLE LCD BOOST CONVERTER |
| 中文描述： | 數(shù)字可調(diào)液晶Boost變換器 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 499K |
| 代理商： | TPS61045DRB |
www.ti.com
VO
IO
CO
1
fs(ILOAD)
IP
L
VO
VF
VI
IP
ESR
IP
375 mA
VI
2
100 ns
(7)
TPS61045
SLVS440A–JANUARY 2003–REVISED SEPTEMBER 2003
APPLICATION INFORMATION (continued)
with:
I
P
= peak current as described in the previous section
peak current control
L = selected inductor value
I
O(LOAD)
=Nominal load current
f
S(ILoad)
= switching frequency at the nominal load current as calaculated previously.
V
F
= rectifier diode forward voltage (typically 0.3 V)
C
O
= selected output capacitor
ESR = output capacitor ESR value
INPUT CAPACITOR SELECTION
The input capacitor (C1) filters the high frequency noise to the control circuit and must be directly connected to
the input pin (VIN) of the device. The capacitor (C2) connected to the L pin of the device is the input capacitor for
the power stage.
The main purpose of the capacitor (C2), that is connected directly to the L pin, is to smooth the inductor current.
A larger capacitor reduces the inductor ripple current present at the L pin. The smaller the ripple current at the L
pin, the higher the efficiency of the converter. If a sufficiently large capacitor is used, the input switch must carry
only the DC current, filtered by the capacitor (C2), and not the high switching currents of the converter. A 4.7 μF
or 10-μF ceramic capacitor (C2) is sufficient for most applications. For better filtering, this value can be increased
without limit. Refer to Table 2 and
typical applications
for input capacitor recommendations.
Table 3. Possible Input and Output Capacitor Selection
CAPACITOR
VOLTAGE RATING
COMPONENT SUPPLIER
COMMENTS
4.7 F/X5R/0805
6.3 V
Tayo Yuden JMK212BY475MG
C
I
/C
O
C
I
/C
O
C
O
C
O
C
O
10 μF/X5R/0805
6.3 V
Tayo Yuden JMK212BJ106MG
1.0 μF/X7R/1206
25 V
Tayo Yuden TMK316BJ105KL
1.0 μF/X7R/1206
35 V
Tayo Yuden GMK316BJ105KL
4.7 μF/X5R/1210
25 V
Tayo Yuden TMK325BJ475MG
DIODE SELECTION
To achieve high efficiency a Schottky diode must be used. The current rating of the diode must meet the peak
current rating of the converter as it is calculated in the
peak current control
section. Use the maximum value for
I
(LIM)
(450mA) for this calculation. Refer to Table 3 and the
typical applications
for the selection of the Schottky
diode.
14
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| TPS61045DRBR | 功能描述:LED顯示驅(qū)動(dòng)器 28-V 85% Eff Boost Converter RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| TPS61045DRBRG4 | 功能描述:LED顯示驅(qū)動(dòng)器 28-V 85% Eff Boost Converter RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| TPS61045DRBT | 功能描述:LED顯示驅(qū)動(dòng)器 28-V 85% Eff Boost Converter RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| TPS61045DRBTG4 | 功能描述:LED照明驅(qū)動(dòng)器 28-V 85% Eff 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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61045EVM-231 | 功能描述:電源管理IC開發(fā)工具 TPS61045-231 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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