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參數資料
| 型號： | TPS40074RHL |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | PLASTIC, QFN-20 |
| 文件頁數： | 24/37頁 |
| 文件大小： | 448K |
| 代理商： | TPS40074RHL |
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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
TPS40074
SLUS617–APRIL 2005
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 =10k.
2. Calculate RSET using Equation 49;RSET = 8750 . Two resistors in parallel, RSET1 and RSET2, are used to
make up RSET.RSET1 =9.53k,RSET2 = 105 k.
3. Using Equation 54 and fZ1 = 3559 Hz, CPZ1 can be calculated to be 4.47 nF; CPZ1=4.7 nF.
4. FP1 and Equation 52 yields RP1 to be 677 ,RP1 = 680 .
5. The required gain of 17.6 dB (7.586) and Equation 52 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 55 and the desired frequency for the second zero, CZ2 =6.8 nF.
7. CP2 is calculated using the second pole frequency and Equation 53,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. Equivalent Series Resistance
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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相關代理商/技術參數 |
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| TPS40074RHLR | 功能描述:DC/DC 開關控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40074RHLRG4 | 功能描述:DC/DC 開關控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40074RHLT | 功能描述:DC/DC 開關控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40074RHLTG4 | 功能描述:DC/DC 開關控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40075 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V TO 18V INPUT 10 PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD |
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