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| 型号： | TPS40074RHL |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | PLASTIC, QFN-20 |
| 文件页数： | 24/37页 |
| 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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| TPS40074RHLR | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40074RHLRG4 | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40074RHLT | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40074RHLTG4 | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40075 | 制造商:TI 制造商全称:Texas Instruments 功能描述:4.5V TO 18V INPUT 10 PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD |
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