參數(shù)資料
型號： TPS40074RHLT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20
封裝： GREEN, PLASTIC, QFN-20
文件頁數(shù)： 24/41頁
文件大?。?/td> 765K
代理商： TPS40074RHLT
www.ti.com
40
60
50
0
30
20
10
40
20
30
10
100
100 k
10 k
1 k
1 M
PWM and LC Response
ESR = 0
Frequency Hz
Gain
dB
Overall System
Response
ESR = 0
fCO2
fCO1
Compensation
Response
Overall System
Response
ESR = 0.0095
GBWP
PWM and LC Response
ESR = 0.0095
SLUS617B – APRIL 2005 – REVISED OCTOBER 2006
Figure 18. Overall System Bode Plot
Using these values and the equations above the resistors and capacitors around the compensation network can
be calculated.
1. Set RZ1 = 10 k.
2. Calculate RSET using Equation 51; RSET = 8750 . Two resistors in parallel, RSET1 and RSET2, are used to
make up RSET. RSET1 = 9.53 k, RSET2 = 105 k.
3. Using Equation 56 and fZ1 = 3559 Hz, CPZ1 can be calculated to be 4.47 nF; CPZ1= 4.7 nF.
4. FP1 and Equation 54 yields RP1 to be 677 , RP1 = 680 .
5. The required gain of 17.2 dB (7.24) and Equation 54 sets the value for RPZ1. Note actual gain used for this
calculation was 20 dB (10), this ensures that the gain of the transfer function is high enough, RPZ1 = 6.2 k.
6. CZ2 is calculated using Equation 57 and the desired frequency for the second zero, CZ2 = 6.8 nF.
7. CP2 is calculated using the second pole frequency and Equation 55, CP2 = 150 pF.
Using MathCAD the above values were used to draw the actual Bode plot for gain and phase. From these plots
the crossover frequency, phase margin and gain margin can be recorded.
Table 3. Theoretical System Stability Results
ESR
CROSSOVER FREQUENCY
PHASE MARGIN
GAIN MARGIN
(
)
(kHz)
(°)
(dB)
0
23.1
72
> 46
0.0095
98.6
78.8
> 33
30
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