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參數(shù)資料
| 型號： | TPS40100RGER |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | GREEN, PLASTIC, QFN-24 |
| 文件頁數(shù)： | 3/39頁 |
| 文件大?。?/td> | 762K |
| 代理商： | TPS40100RGER |
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Calculating the Current Sense Filter Network
L
To ISNS pin
UDG04150
To VO pin
VO
CO
RLDC
CFLT
VIN
RFLT
100
RFLT +
L
RLDC CFLT
* 100 (W)
(6)
Compensation for Inductor Resistance Change Over Temperature
TPS40100
SLUS601–MAY 2005
APPLICATION INFORMATION (continued)
The TPS 40100 gets current feedback information by sensing the voltage across the inductor resistance, RLDC.In
order to do this, a filter must be constructed that allows the sensed voltage to be representative of the actual
current in the inductor. This filter is a series R-C network connected across the inductor as shown in Figure 3.
Figure 3. Current Sensing Filter Circuit
If the RFLT-CFLT time constant is matched to the L/RLDC time constant, the voltage across CFLT is equal to the
voltage across RLDC. It is recommended to keep RFLT 10 k or less. CFLT can be arbitrarily chosen to meet this
condition (100 nF is suggested). RFLT can then be calculated.
where
RFLT is the current sense filter resistance ()
CFLT is the current sense filter capacitance (F)
L is the output inductance (H)
RLDC is the DC resistance of the output inductor ()
When laying out the board, better performance can be accomplished by locating CFLT as close as possible to the
VO and ISNS pins. The closer the two resistors can be brought to the device the better as this reduces the
length of high impedance runs that are susceptible to noise pickup. The 100- resistor from VOUT to the VO pin
of the device is to limit current in the event that the output voltage dips below ground when a short is applied to
the output of the converter.
The resistance in the inductor that is sensed is the resistance of the copper winding. This value changes over
temperature and has approximately a 4000 ppm/°C temperature coefficient. The gain of current sense amplifier
in the TPS40100 has a built in temperature coefficient of approximately -2000 ppm/°C. If the circuit is physically
arranged so that there is good thermal coupling between the inductor and the device, the thermal shifts tend to
offset. If the thermal coupling is perfect, the net temperature coefficient is 2000 ppm/°C. If the coupling is not
perfect, the net temperature coefficient lies between 2000 ppm/°C and 4000 ppm/°C. For most applications this is
sufficient. If desired, the temperature drifts can be compensated for. The following compensation scheme
assumes that the temperature rise at the device is directly proportional to the temperature rise at the inductor. If
this is not the case, compensation accuracy suffers. Also, there is generally a time lag in the temperature rise at
the device vs. at the inductor that could introduce transient errors beyond those predicted by the compensation.
Also, the 100- resistor in Figure 3 is not shown. However, it is required if the output voltage can dip below
ground during fault conditions. The calculations are not afffected, other than increasing the effective value of RF1
by 100-.
11
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| TPS40100RGERG4 | 功能描述:DC/DC 開關(guān)控制器 Wide In Range Sync Buck for Sequencing RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40100RGET | 功能描述:DC/DC 開關(guān)控制器 Wide In Range Sync Buck for Sequencing RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40100RGETG4 | 功能描述:DC/DC 開關(guān)控制器 Wide In Range Sync Buck for Sequencing RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40101 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH ADVANCED SEQUENCING AND OUTPUT MARGINING |
| TPS40101RGER | 功能描述:DC/DC 開關(guān)控制器 Mid Range Input Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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