參數(shù)資料
型號(hào)： TPS40090QPWRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO24
封裝： GREEN, PLASTIC, TSSOP-24
文件頁(yè)數(shù)： 9/23頁(yè)
文件大?。?/td> 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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