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參數資料
型號： TPS61026DRCTG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩壓器
英文描述： 2.1 A SWITCHING REGULATOR, 720 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, GREEN, PLASTIC, SON-10
文件頁數： 7/29頁
文件大小： 746K
代理商： TPS61026DRCTG4
www.ti.com
APPLICATION INFORMATION
DESIGN PROCEDURE
PROGRAMMING THE OUTPUT VOLTAGE
R3 + R4
V
O
V
FB
* 1 + 180 kW
V
O
500 mV *
1
(1)
C
parR3 +
20 pF
200 kW
R4
* 1
(2)
SW
C1
Power
Supply
L1
R1
R2
VBAT
VOUT
FB
C2
C3
LBO
PGND
LBI
PS
EN
GND
TPS61020
VCC
Boost Output
Control Output
R3
R4
R5
PROGRAMMING THE LBI/LBO THRESHOLD VOLTAGE
SLVS451D – SEPTEMBER 2003 – REVISED FEBRUARY 2006
The TPS6102x dc/dc converters are intended for systems powered by a single up to triple cell Alkaline, NiCd,
NiMH battery with a typical terminal voltage between 0.9 V and 6.5 V. They can also be used in systems
powered by one-cell Li-Ion or Li-Polymer with a typical voltage between 2.5 V and 4.2 V. Additionally, any other
voltage source with a typical output voltage between 0.9 V and 6.5 V can power systems where the TPS6102x is
used.
The output voltage of the TPS61020 dc/dc converter can be adjusted with an external resistor divider. The typical
value of the voltage at the FB pin is 500 mV. The maximum recommended 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 A, 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 A 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 (VO), can be calculated using
If as an example, an output voltage of 3.3 V is needed, a 1.0-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, in case the device shows instable regulation of the output voltage. The required capacitance
value can be easily calculated using Equation 2:
Figure 22. Typical Application Circuit for Adjustable Output Voltage Option
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 A, 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 R2 is therefore in the range of 500
k
. From that, the value of resistor R1, depending on the desired minimum battery voltage VBAT, can be
calculated using Equation 3.
Copyright 2003–2006, Texas Instruments Incorporated
15
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相關代理商/技術參數
參數描述
TPS61027 制造商:TI 制造商全稱:Texas Instruments 功能描述:96% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 1.5-A SWITCH
TPS61027DRC 制造商:TI 制造商全稱:Texas Instruments 功能描述:96% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 1.5-A SWITCH
TPS61027DRCR 功能描述:直流/直流開關調節器 5-V Otp 1.5-A Swit Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS61027DRCR 制造商:Texas Instruments 功能描述:DC/DC Converter IC
TPS61027DRCRG4 功能描述:直流/直流開關調節器 5-V Otp 1.5-A Swit Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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