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| 型號： | TPS40091RHDRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | GREEN, PLASTIC, QFN-28 |
| 文件頁數(shù)： | 9/31頁 |
| 文件大?。?/td> | 881K |
| 代理商： | TPS40091RHDRG4 |
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THERMAL COMPENSATION OF DCR CURRENT SENSING
V
DCR + VIN * VOUT
DCR
DCR ) w
L
(14)
V
C + VIN * VOUT
1
w
C
R )
1
w
C
(15)
V
C +
1
w
C
R )
1
w
C
+
DCR
DCR ) w
L
;
L
DCR +
R
C;
t
DCRL +
t
RC
(16)
K(T) + 1 ) 0.0039
(T * 25)
(17)
R
L
DCR
C
R2
R1
RNTC
RTHE
SLUS578B – OCTOBER 2003 – REVISED MAY 2006
APPLICATION INFORMATION (continued)
Inductor DCR current sensing is a known lossless technique to retrieve a current proportional signal.
Equation 14 and Equation 15 show the calculation used to determine the DCR voltage drop for any given
frequency. (See Figure 10)
Voltage across the capacitor is equal to voltage drop across the inductor DCR, VC = VDCR when time constant of
the inductor and the time constant of the R-C network are equal:
The output signal generated by the network shown in Figure 10 is temperature dependant due to positive
thermal coefficient of copper specific resistance as determined using Equation 17. The temperature variation of
the inductor coil can exceed 100
°C in a practical application leading to approximately 40% variation in the output
signal and in turn, respectively move the overcurrent threshold and the load line.
The relatively simple network shown in Figure 11 (made of passive components including one NTC resistor) can
provide almost complete compensation for copper thermal variations.
Figure 10.
Figure 11.
17
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| TPS40091RHDT | 功能描述:DC/DC 開關(guān)控制器 4Ch Multiphase Buck DC/DC 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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