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參數(shù)資料
| 型號： | TPS65105RGE |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND VCOM BUFFER |
| 中文描述： | 三路輸出液晶供應(yīng)線性穩(wěn)壓器和VCOM緩沖器 |
| 文件頁數(shù)： | 13/25頁 |
| 文件大?。?/td> | 816K |
| 代理商： | TPS65105RGE |
www.ti.com
APPLICATION INFORMATION
BOOST CONVERTER DESIGN PROCEDURE
The first step in the design procedure is to calculate the maximum possible output current of the main boost
converter under certain input and output voltage conditions. The following example is for a 3.3-V to 10-V
conversion:
D
Vout
Vout
VD
VD
Vin
Vsw
10 V
10 V
0.8 V
0.8 V
3.3 V
0.5 V
0.73
IL
Iout
1
D
300 mA
1
0.73
1.11 A
iL
Vin
Vsw
D
fs
L
(3.3 V
1.6 MHz
0.5 V)
0.73
4.2 H
304 mA
Iswpeak
IL
iL
2
1.11 A
304 mA
2
1.26 A
Inductor Selection
TPS65100
TPS65105
SLVS496B–SEPTEMBER 2003–REVISED MARCH 2004
V
in
= 3.3 V, V
out
= 10 V, Switch voltage drop V
sw
= 0.5 V, Schottky diode forward voltage V
D
= 0.8 V
1. Duty cycle:
2. Average inductor current:
3. Inductor peak-to-peak ripple current:
4. Peak switch current:
. The integrated switch, the inductor, and the external Schottky diode must be able to handle the peak switch
current. The calculated peak switch current has to be equal to or lower than the minimum N-MOSFET switch
current limit as specified in the electrical characteristics table (1.6 A for the TPS65100 and 0.96 A for the
TPS65105). If the peak switch current is higher, then the converter cannot support the required load current. This
calculation must be done for the minimum input voltage where the peak switch current is highest. The calculation
includes conduction losses like switch r
DSon
(0.5 V) and diode forward drop voltage losses (0.8 V). Additional
switching losses, inductor core and winding losses, etc., require a slightly higher peak switch current in the actual
application. The above calculation still allows a for good design and component selection.
Several inductors work with the TPS65100/05. Especially with the external compensation, the performance can
be adjusted to the specific application requirements. The main parameter for inductor selection is the saturation
current of the inductor which should be higher than the peak switch current as calculated above with additional
margin to cover for heavy load transients and extreme start-up conditions. Another method is to choose the
inductor with a saturation current at least as high as the minimum switch current limit of 1.6 A for the TPS65100
and 0.96 A for the TPS65105. The different switch current limits allow selection of a physically smaller inductor
when less output current is required. The second important parameter is inductor dc resistance. Usually, the
lower the dc resistance, the higher the efficiency. However, inductor dc resistance, is not the only parameter
determining the efficiency. Especially for a boost converter where the inductor is the energy storage elemen,t the
type and material of the inductor influences the efficiency as well. Especially at the high switching frequency of
1.6 MHz, inductor core losses, proximity effects, and skin effects become more important. Usually, an inductor
with a larger form factor yields higher efficiency. The efficiency difference between different inductors can vary
between 2% to 10%. For the TPS65100/05, 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.
13
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| TPS65105RGER | 功能描述:LCD 驅(qū)動器 LCD Supply with Vcom Buffer RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)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 |
| TPS65105RGERG4 | 功能描述:LCD 驅(qū)動器 LCD Supply with Vcom Buffer RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)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 |
| TPS65110RGE | 功能描述:電荷泵 Triple Chargepump for LTPS LCD RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| TPS65110RGEG3 | 功能描述:電荷泵 Triple Chargepump for LTPS LCD RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| TPS65110RGER | 功能描述:電荷泵 Triple Chargepump for LTPS LCD RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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