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参数资料
| 型号： | TPS65140PWPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.6 A SWITCHING REGULATOR, 2100 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | GREEN, PLASTIC, HTSSOP-24 |
| 文件页数： | 5/31页 |
| 文件大小： | 1391K |
| 代理商： | TPS65140PWPG4 |
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APPLICATION INFORMATION
BOOST CONVERTER DESIGN PROCEDURE
D +
Vout ) VD * Vin
Vout ) VD * Vsw
+
10 V ) 0.8 V * 3.3 V
10 V ) 0.8 V * 0.5 V
+ 0.73
I
L +
Iout
1 * D
+
300 mA
1 * 0.73
+ 1.11 A
Di
L +
V
in *
Vsw
D
fs
L
+
(3.3 V * 0.5 V)
0.73
1.6 MHz
4.2 mH
+ 304 mA
I
swpeak +
I
L )
DiL
2
+ 1.11 A )
304 mA
2
+ 1.26 A
Inductor Selection
SLVS497C – SEPTEMBER 2003 – REVISED APRIL 2006
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:
Vin = 3.3 V, Vout = 10 V, Switch voltage drop Vsw = 0.5 V, Schottky diode forward voltage VD = 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 or lower than the minimum N-MOSFET switch
current limit as specified in the electrical characteristics table (1.6 A for the TPS65140/41 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 rDS(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 TPS6514x. 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
TPS65140/41 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 TPS6514x, inductor values between 3.3
H
and 6.8
H are a good choice but other values can be used as well. Possible inductors are shown in Table 1.
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS65140PWPR | 功能描述:LCD 驱动器 Trp-Ch 2.1-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65140PWPRG4 | 功能描述:LCD 驱动器 Trp-Ch 2.1-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65140RGER | 功能描述:LCD 驱动器 Trp-Ch 2.1-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65140RGERG4 | 功能描述:LCD 驱动器 Trp-Ch 2.1-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65141PWP | 功能描述:LCD 驱动器 5V/1.6A(I/O) 4-CH Multi-Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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