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(yè)數(shù)： 12/20頁(yè)
文件大?。?/td> 499K
代理商： TPS61045DRB
www.ti.com
tfall
IP
VO–VI
L
Iload max
IP
2
VI
VO
(4)
Iload max
I
2
P
IP
L
VI
VO–VI
2
L
2
400 ns
VI
(5)
IP
300 mA
VI
2
100 ns
(6)
VO(min)
V(FB)
R1
R2
1
VO(max)
V(FB)
R1
R3
V(FB)
R1
R2
1
TPS61045
SLVS440A–JANUARY 2003–REVISED SEPTEMBER 2003
APPLICATION INFORMATION (continued)
For t
f
≥
400 ns
t
f
≤
400 ns
with:
L = selected inductor value
η
= expected converter efficiency (typically between 70% to 85%)
I
P
= peak current as described in the previous
peak current control
section.
The above formula contains the expected converter efficiency that allows calculating the expected maximum load
current the converter can support. The efficiency can be taken out of the efficiency graphs shown in Figures 2
and 3 or 80% can be used as a good estimation.
The selected inductor must have a saturation current which meets the maximum peak current of the converter as
calculated in the
peak current control
section. Use the maximum value for I
Lim
(450mA) for this calculation.
Another important inductor parameter is the dc resistance. The lower the dc resistance, the higher the efficiency
of the converter. Refer to the Table 1 and the
inductor selection
section under
typical applications
.
Table 2. Possible Inductor Selection
INDUCTOR VALUE
COMPONENT SUPPLIER
COMMENTS
10 μH
Sumida CR32-100
High efficiency
10 μH
Sumida CDRH3D16-100
High efficiency
10 μH
Murata LQH43CN100K01
4.7 μH
Sumida CDRH3D16-4R7
Small solution size
4.7 μH
muRata LQH32CN4R7M51
Small solution size
SETTING THE OUTPUT VOLTAGE
When the converter is programmed to the minimum output voltage, the DAC output (DO) equals the reference
voltage of 1.233 V (typ). Therefore, only the feedback resistor network (R1) and (R2) determines the output
voltage under these conditions. This gives the minimum output voltage possible and can be calculated as:
The maximum output voltage is determined as the DAC output (DO) is set to 0 V:
12
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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(kāi)發(fā)工具 TPS61045-231 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
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