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參數(shù)資料
| 型號： | TPS61091RSA |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | SYNCHRONOUS BOOST CONVERTER WITH 2A SWITCH |
| 中文描述： | 同步升壓轉(zhuǎn)換器具有2A開關(guān) |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 457K |
| 代理商： | TPS61091RSA |
www.ti.com
APPLICATION INFORMATION
DESIGN PROCEDURE
The TPS6109x dc/dc converters are intended for systems powered by a dual or triple cell NiCd or NiMH battery
with a typical terminal voltage between 1.8 V and 5.5 V. They can also be used in systems powered by one-cell
Li-Ion with a typical stack voltage between 2.5 V and 4.2 V. Additionally, two or three primary and secondary
alkaline battery cells can be the power source in systems where the TPS6109x is used.
Programming the Output Voltage
R3
R4
VO
VFB
1
200 k
VO
500 mV
1
(1)
CparR3
10 pF
200 k
R4
–1
(2)
SW
C1
Power
Supply
L1
R1
R2
VBAT
VOUT
FB
C2
C3
LBO
PGND
LBI
SYNC
EN
GND
TPS6109x
V
OUT
Boost Output
Low Battery
Output
R3
R4
R5
Programming the LBI/LBO Threshold Voltage
The current through the resistive divider should be about 100 times greater than the current into the LBI pin. The
typical current into the LBI pin is 0.01 μA, and the voltage across R2 is equal to the LBI voltage threshold that is
generated on-chip, which has a value of 500 mV. The recommended value for R2is therefore in the range of 500
k
. From that, the value of resistor R1, depending on the desired minimum battery voltage V
BAT,
can be
calculated using Equation 3.
TPS61090
TPS61091, TPS61092
SLVS484A–JUNE 2003–REVISED APRIL 2004
The output voltage of the TPS61090 dc/dc converter section can be adjusted with an external resistor divider.
The typical value of the voltage on the FB pin is 500 mV. The maximum allowed value for the output voltage is
5.5 V. The current through the resistive divider should be about 100 times greater than the current into the FB
pin. The typical current into the FB pin is 0.01 μA, and the voltage across R4 is typically 500 mV. Based on those
two values, the recommended value for R4 should be lower than 500 k
, in order to set the divider current at 1
μA or higher. Because of internal compensation circuitry the value for this resistor should be in the range of 200
k
. From that, the value of resistor R3, depending on the needed output voltage (V
O
), can be calculated using
Equation 1:
If as an example, an output voltage of 5.0 V is needed, a 1.8-M
resistor should be chosen for R3. If for any
reason the value for R4 is chosen significantly lower than 200 k
additional capacitance in parallel to R3 is
recommended. The required capacitance value can be easily calculated using Equation 2
Figure 18. Typical Application Circuit for Adjustable Output Voltage Option
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS61091RSAR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3-V Output 500-mA Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS61091RSARG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3-V Output 500-mA Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS61092 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SYNCHRONOUS BOOST CONVERTER WITH 2A SWITCH |
| TPS61092RSA | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SYNCHRONOUS BOOST CONVERTER WITH 2A SWITCH |
| TPS61092RSAR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5-V Output 96% Eff Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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