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參數(shù)資料
| 型號： | 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)： | 9/20頁 |
| 文件大?。?/td> | 499K |
| 代理商： | TPS61045DRB |
www.ti.com
VO(DO)
Vref
2
6
–1
TPS61045
SLVS440A–JANUARY 2003–REVISED SEPTEMBER 2003
DETAILED DESCRIPTION (continued)
SOFTSTART
All inductive step-up converters exhibit high inrush current during start up if no special precautions are taken.
This can cause voltage drops at the input rail during start-up, which may result in an unwanted or premature
system shut down.
When the device is enabled, the internal input switch (Q1) is slowly turned on to reduce the in-rush current
charging the capacitor (C2) connected to pin L. Furthermore, the TPS61045 limits this in-rush current during
start-up by increasing the current limit in two steps starting from I
LIM
/4 for 256 switch cycles to I
LIM
/2 for the next
256 switch cycles.
ENABLE (CTRL PIN)
The CTRL pin serves two functions. One is the enable and disable of the device. The other is the output voltage
programming of the device. If the digital interface is not required, the CTRL pin is used as a standard enable pin
for the device.
Pulling the CTRL pin high enables the device beginning with the softstart cycle.
Pulling the CTRL pin to ground for a period of
≥
560 μs shuts down the device, reducing the shutdown current to
0.1 μA (typ). During shutdown the internal input switch (Q1) remains open and disconnects the load from the
input supply of the device.
This pin must be terminated.
DAC OUTPUT (DO)
The TPS61045 allows digital adjustment of the output voltage using the digital CTRL interface as described in
the next section. The DAC output pin (DO) drives an external resistor (R3) connected to the external feedback
divider. The DO output has a typical output voltage range from 0 V to V
ref
(1.233V). If the DO output voltage is
set to 0 V, the external resistor (R3) is more or less in parallel to the lower feedback resistor (R2) giving the
highest output voltage. Programming the DO output to V
ref
gives the lowest output voltage. Internally, a 6-bit DAC
is used with 64-steps and 0 as the first step. This gives a typical voltage step of 19.6 mV which is calculated as:
See the section
setting the output voltage
for further information.
After start-up, when the CTRL pin is pulled high, the DO output voltage is set to its center voltage which is the
32nd step of typically V
(DO)
= 607mV.
DIGITAL INTERFACE (CTRL)
When the CTRL pin is pulled high the device starts up with softstart and the DAC output voltage (DO) sets to its
center voltage with a typical output voltage of 607 mV.
The output voltage can be programmed by pulling the CTRL pin low for a certain period of time. Depending on
this time period the internal DAC voltage increases or decreases one digital step, as outlined in Table 1 and
Figure 16. Programming the DAC output V
(DO)
to 0 V places R3 in parallel to R2, which gives the maximum
output voltage. If the DAC is programmed to its maximum output voltage equal to the internal reference voltage,
typically V
(DO)
=1.233 V, then the output has its minimum output voltage.
9
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| TPS61045DRBR | 功能描述:LED顯示驅(qū)動器 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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