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| 型号： | TPS40195PWG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, TSSOP-16 |
| 文件页数： | 22/43页 |
| 文件大小： | 1086K |
| 代理商： | TPS40195PWG4 |
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-60
-40
-20
0
20
40
60
80
10
100
1000
10000
100000
1000000
Frequency - Hz
G
a
in
-
d
B
-45
0
45
90
135
180
P
h
a
s
e
-
°
PHASE
GAIN
www.ti.com ........................................................................................................................................ SLUS720D – FEBRUARY 2007 – REVISED NOVEMBER 2008
2. Place the second zero near the double pole fZ2 at 5.8 kHz.
3. Place one pole well above the desired cross over frequency, selected as one sixth the switching frequency,
fCO1 = 50 kHz, fP1 = 300 kHz
4. Place the second pole near the ESR zero of the output capacitors of 318 kHz. fP2 = 318 kHz
5. The high frequency gain must be such that the over all system has 0 dB at the required crossover frequency.
This gain is -1 times the sum of the modulator gain and the gain of the output stage at the crossover
frequency of 50 kHz.
Using these values and the above equations calculate the set point and the Rs and Cs around the compensation
network using the following procedure.
1. Set RZ1 = 51 k
3. Using Equation 47 and fZ1 = 1.8 kHz, CPZ1 can be calculated to be 1500 pF, FP1 and Equation 45 yields RP1
to be 363
and the standard value 357 is used.
4. From Figure 25, the required gain is calculated at 15.8 dB. Equation 44 sets the value for RPZ2. A resistor for
RPZ2 with value of 12.7 k is used. CZ2 is calculated using Equation 48 and the desired frequency for the
second zero, CZ2 = 1475 pF. A 2200 pF capacitor is used.
5. CP2 is calculated using the second pole frequency and Equation 46, CP2 = 37 pF. A 33-pf capacitor is used.
Figure 28. Final Bode Plot
Copyright 2007–2008, Texas Instruments Incorporated
29
Product Folder Link(s): TPS40195
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| TPS40195PWR | 功能描述:DC/DC 开关控制器 4.5V to 20V Buck 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 |
| TPS40195PWRG4 | 功能描述:DC/DC 开关控制器 4.5V-20V Buck Cntrlr 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 |
| TPS40195RGYR | 功能描述:DC/DC 开关控制器 4.5V-20V Buck Cntrlr 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 |
| TPS40195RGYRG4 | 功能描述:DC/DC 开关控制器 4.5V-20V Buck Cntrlr 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 |
| TPS40195RGYT | 功能描述:DC/DC 开关控制器 4.5V-20V Buck Cntrlr 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 |
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