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參數資料
| 型號： | TPS40090QPWRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | GREEN, PLASTIC, TSSOP-24 |
| 文件頁數： | 9/23頁 |
| 文件大小： | 309K |
| 代理商： | TPS40090QPWRQ1 |
GAIN AND PHASE
vs
FREQUENCY
G
-
Gain
-
dB
Phase
-
°
f - Frequency - Hz
60
0
10
20
40
50
30
-20
-10
0
60
80
20
40
-20
100
1 k
10 k
100 k
1 M
Phase
Gain
VIN = 12 V
VOUT = 1.5 V
IOUT= 100 A
V
DCR + VIN * VOUT
DCR
DCR ) w
L
V
C + VIN * VOUT
1
w
C
R )
1
w
C
V
C +
1
w
C
R )
1
w
C
+
DCR
DCR ) w
L
;
L
DCR +
R
C;
t
DCRL +
t
RC
K(T) + 1 ) 0.0039
(T * 25)
SLUS845C
– JUNE 2008 – REVISED MAY 2011
When attempting to close the feedback loop at frequency that is near the theoretical limit, use the above
considerations as a first approximation and perform on bench measurements of closed loop parameters as
effects of switching frequency proximity and finite bandwidth of voltage and current amplifiers may substantially
alter them as it is shown in Figure 10.
Figure 10.
Thermal Compensation of DCR Current Sensing
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
(14)
(15)
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:
(16)
The output signal generated by the network shown in Figure 11 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.
(17)
The relatively simple network shown in Figure 12 (made of passive components including one NTC resistor) can
provide almost complete compensation for copper thermal variations.
Copyright
2008–2011, Texas Instruments Incorporated
17
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS40090RHDR | 功能描述:DC/DC 開關控制器 4 Ch Multiph Buck DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40090RHDRG4 | 功能描述:DC/DC 開關控制器 4Ch Multiphase Buck DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40090RHDT | 功能描述:DC/DC 開關控制器 4Ch Multiphase Buck DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40090RHDTG4 | 功能描述:DC/DC 開關控制器 4Ch Multiphase Buck DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40091 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH FREQUENCY MULTIPHASE CONTROLLER |
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