參數(shù)資料
型號： TPS61200DRCTG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 1.5 A BATTERY CHARGE CONTROLLER, 1650 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, GREEN, PLASTIC, SON-10
文件頁數(shù)： 7/28頁
文件大?。?/td> 1012K
代理商： TPS61200DRCTG4
www.ti.com
APPLICATION INFORMATION
DESIGN PROCEDURE
Programming the Output Voltage
OUT
FB
V
R1 = R2 x
- 1
V
÷
è
(1)
L
VIN
EN
UVLO
PS
GND
PGND
FB
VAUX
VOUT
TPS61200
VIN
VOUT
C1
C2
C3
L1
R1
R2
R3
R4
Programming the UVLO Threshold Voltage
SLVS577B – MARCH 2007 – REVISED FEBRUARY 2008
The TPS6120x 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 0.7 V and 5.5 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 like solar cells or fuel cells with a typical output voltage between 0.3 V and 5.5 V can power
systems where the TPS6120x is used.
Within the TPS6120X family, there are fixed and adjustable output voltage versions available. To properly
configure the fixed output voltage devices, the FB pin is used to sense the output voltage. This means that it
must be connected directly to VOUT. At the adjustable output voltage versions, an external resistor divider is
used to adjust the output voltage. The resistor divider must be connected between VOUT, FB and GND. When
the output voltage is regulated properly, 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 the resistor between FB and GND, R2, is typically 500 mV. Based on those two values, the recommended
value for R2 should be lower than 500 k, in order to set the divider current at 1 A or higher. It is recommended
to keep the value for this resistor in the range of 200 k
. The value of the resistor connected between VOUT and
FB, R1, depending on the needed output voltage (VOUT), can be calculated using Equation 1:
If as an example, an output voltage of 3.3 V is needed, a 1-M
resistor should be chosen for R1 when for R2 a
180-k
has been selected.
Figure 24. Typical Application Circuit for Adjustable Output Voltage Option
The UVLO input can be used to shut down the main output if the supply voltage is getting too low. The internal
reference threshold is typically 250 mV. If the supply voltage should cause the shutdown when it is dropping
below 250 mV, it can be connected directly to the UVLO pin. If the shutdown has already happen at higher
voltages, a resistor divider can be used. R3 and R4 in Figure 24 show an example of how to monitor the input
voltage of the circuit. The current through the resistive divider should be about 100 times greater than the current
into the UVLO pin. The typical current into the UVLO pin is 0.01
A, and the voltage across R4 is equal to the
UVLO voltage threshold that is generated on-chip, which has a value of 250 mV. The recommended value for R4
is; therefore, in the range of 250 k
. From this, the value of resistor R3, depending on the desired shutdown
voltage VINMIN, can be calculated using Equation 2.
Copyright 2007–2008, Texas Instruments Incorporated
15
Product Folder Link(s): TPS61200 TPS61201 TPS61202
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS61200EVM-179 功能描述:電源管理IC開發(fā)工具 TPS61200EVM-179 Evaluation Module RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS61201 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH 1.3-A SWITCHES
TPS61201DRC 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH 1.3-A SWITCHES
TPS61201DRCR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 0.3V In Vltg Boost 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
TPS61201DRCRG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 0.3V In 3.3V Out Vltg 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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