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參數資料
| 型號： | TPS65150RGE |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Low Input Voltage, Compact LCD Bias IC With VCOM Buffer |
| 中文描述： | 低輸入電壓，緊湊型LCD偏置集成電路VCOM緩沖器 |
| 文件頁數： | 17/28頁 |
| 文件大?。?/td> | 1126K |
| 代理商： | TPS65150RGE |
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Thermal Shutdown
A thermal shutdown is implemented to prevent damage because of excessive heat and power dissipation.
Typically, the thermal shutdown threshold is 155
°
C . When this threshold is reached, the device enters shutdown.
The device can be enabled again by cycling the input voltage to GND.
Vcom Buffer
The VCOM Buffer is a transconductance amplifier designed to drive capacitive loads. The IN pin is the input of
the VCOM buffer. If the VCOM buffer is not required for certain applications, it is possible to shut down the
VCOM buffer by connecting IN to ground, reducing the overall quiescent current. The VCOM buffer features a
soft start, avoiding a large voltage drop at Vs during startup. The VCOM buffer input, IN, cannot be pulled
dynamically to ground during operation.
Boost Converter Design Procedure
The first step in the design procedure is to verify whether the maximum possible output current of the boost
converter supports the specific application requirements. A simple approach is to estimate the converter
efficiency, by taking the efficiency numbers from the provided efficiency curves, or use a worst case assumption
for the expected efficiency, e.g. 75%.
1. Duty Cycle : D
1
Vin
Vout
(5)
2. Maximum output current : Iout
Isw
Vin
D
2
s
L
(1
D)
(6)
3. Peak switch current : Iswpeak
Vin
D
2
s
L
Iout
1
D
(7)
Inductor Selection
Several inductors work with the TPS65150. Especially with external compensation, the performance can be
adjusted to the specific application requirements. The main parameter for the inductor selection is the inductor
saturation current, which should be higher than the peak switch current as calculated previously with additional
margin to cover for heavy load transients. The alternative, more conservative approach, is to choose the inductor
with a saturation current at least as high as the typical switch current limit of 2.5 A. The second important
parameter is the inductor DC resistance. Usually the lower the DC resistance the higher the efficiency. It is
important to note that the inductor DC resistance is not the only parameter determining the efficiency. For a
boost converter, where the inductor is the energy storage element, the type and material of the inductor
influences the efficiency as well. Especially at high switching frequencies of 1.2 MHz, inductor core losses,
proximity effects, and skin effects become more important. Usually an inductor with a larger form factor gives
higher efficiency. The efficiency difference between different inductors can vary between 2% to 10%. For the
TPS65150, inductor values between 3.3 μH and 6.8 μH are a good choice, but other values can be used as well.
Possible inductors are shown in
Table 1
.
TPS65150
SLVS576–SEPTEMBER 2005
DETAILED DESCRIPTION (continued)
With
Isw = Converter switch current (minimum switch current limit = 2.0 A)
fs = Converter switching frequency (typical 1.2 MHz)
L = Selected inductor value
η
= Estimated converter efficiency (use the number from the efficiency plots, or 0.75 as an estimation)
The peak switch current is the steady-state peak switch current that the integrated switch, inductor, and external
Schottky diode has to be able to handle. The calculation must be done for the minimum input voltage where the
peak switch current is highest. For the calculation of the maximum current delivered by the boost converter it
needs to be considered that the positive and negative charge pumps as well as the VCOM buffer run from the
output of the boost converter as well.
17
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相關代理商/技術參數 |
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|---|---|
| TPS65150RGER | 功能描述:LCD 驅動器 Compact LCD Bias Supply IC RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65150RGERG4 | 功能描述:LCD 驅動器 Compact LCD Bias Supply IC RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65154RSLR | 制造商:Texas Instruments 功能描述:IC TRIPLE-OUT LCD SUPPLY 48VQFN |
| TPS65155RKPR | 功能描述:LCD 驅動器 LCD Bias Solution RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65160APWP | 功能描述:其他電源管理 Bias Power Supply RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
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