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參數(shù)資料
| 型號： | TPS65145RGE |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD |
| 中文描述： | 三路輸出液晶供應(yīng)線性穩(wěn)壓器和電源良好 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大小： | 865K |
| 代理商： | TPS65145RGE |
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. Below is an example 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
3. Inductor peak-to-peak ripple current:
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
TPS65140
TPS65145
SLVS497B–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:
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 or lower to the minimum N-MOSFET switch current
limit as specified in the electrical characteristics table (1.6 A for the TPS65140 and 0.96 A for the TPS65145). 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
DS(on)
(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 for a good design and component selection.
Several inductors work with the TPS65140. Especially with the external compensation, the performance can be
adjusted to the specific application requirements. The main parameter for the 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 TPS65140
and 0.96 A for the TPS65145. The different switch current limits allow selection of a physically smaller inductor
when less output current is required. The second important parameter is the inductor dc resistance. Usually, the
lower the dc resistance, the higher the efficiency. However, the inductor dc resistance is not the only parameter
determining the efficiency. Especially 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 1.6
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 TPS65140, 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.
12
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| TPS65145RGER | 功能描述:LCD 驅(qū)動器 Trp-Ch 1.3-A Swit Boost Converter 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 |
| TPS65145RGERG4 | 功能描述:LCD 驅(qū)動器 Trp-Ch 1.3-A Swit Boost Converter 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 |
| TPS65146RGER | 功能描述:LCD 驅(qū)動器 Compact LCD Bias IC for Notebook & Mon 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 |
| TPS65148RHBR | 功能描述:LCD Gamma緩沖器 Compact TFT LCD Bias IC RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| TPS65148RHBT | 功能描述:LCD Gamma緩沖器 Compact TFT LCD Bias IC RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
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