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参数资料
| 型号： | TPS65101PWP |
| 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： | 5/30页 |
| 文件大小： | 1213K |
| 代理商： | TPS65101PWP |
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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
SLVS496C – 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. The following example is 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 to or lower than the minimum N-MOSFET switch
current limit as specified in the electrical characteristics table (1.6 A for the TPS65100/01 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 rDSon (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 TPS6510x series. 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
TPS65100/01 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 TPS6510x series, 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 |
|---|---|
| TPS65101PWPG4 | 功能描述:LCD 驱动器 Triple Output LCD Supply 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 |
| TPS65101PWPR | 功能描述:LCD 驱动器 Triple Output LCD Supply 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 |
| TPS65101PWPRG4 | 功能描述:LCD 驱动器 Triple Output LCD Supply 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 |
| TPS65101RGER | 功能描述:LCD 驱动器 Triple Output LCD Supply 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 |
| TPS65101RGERG4 | 功能描述:LCD 驱动器 Triple Output LCD Supply 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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