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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)： | 8/20頁 |
| 文件大?。?/td> | 499K |
| 代理商： | TPS61045DRB |
www.ti.com
500
μ
s/Div
I
I
= 50 mA/Div
CTRL 2 V/Div
V
O
= 5 V/Div
IP(typ)
I(LIM)
VI
L
100 ns
(1)
IP(typ)
400 mA
VI
L
100 ns
TPS61045
SLVS440A–JANUARY 2003–REVISED SEPTEMBER 2003
Typical Characteristics (continued)
Figure 15 . Soft Start
DETAILED DESCRIPTION
OPERATION
The TPS61045 operates with an input voltage range of 1.8 V to 6.0 V and generates output voltages up to 28 V.
The device operates in a pulse frequency modulation (PFM) scheme with constant peak current control. This
control scheme maintains high efficiency over the entire load current range and, with a switching frequency of up
to 1 MHz, the device enables the use of small external components.
The converter monitors the output voltage and when the feedback voltage falls below the reference voltage of
1.233 V (typ) the main switch turns on and the current ramps up. The main switch turns off when the inductor
current reaches the internally set peak current of 375 mA (typ). Refer to the
peak current control
section for more
information. The second criteria that turns off the main switch is the maximum on-time of 6 μs (typ). This limits
the maximum on-time of the converter in extreme conditions. As the switch is turned off, the external Schottky
diode is forward biased delivering the current to the output. The main switch remains off until the minimum off
time of 400 ns (typ) has passed and the feedback voltage is below the reference voltage again. Using this PFM
peak current control scheme, the converter operates in discontinuous conduction mode (DCM) where the
switching frequency depends on the input voltage, output voltage and output current. This gives a high efficiency
over the entire load current range. This regulation scheme is inherently stable which allows a wider range for the
selection of the inductor and output capacitor.
PEAK CURRENT CONTROL
The internal switch is turned on until the inductor current reaches the typical dc current limit (I
LIM
) of 375 mA. Due
to the internal current limit delay of 100 ns (typ) the actual current exceeds the dc current limit threshold by a
small amount. The typical peak current limit can be calculated:
The higher the input voltage and the lower the inductor value, the greater the current limit overshoot.
8
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參數(shù)描述 |
|---|---|
| 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 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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