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参数资料
| 型号： | TPS51116RGER |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 6 A SWITCHING CONTROLLER, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件页数： | 10/40页 |
| 文件大小： | 931K |
| 代理商： | TPS51116RGER |
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APPLICATION INFORMATION
Loop Compensation and External Parts Selection
Current Mode Operation
H(s) + H1(s)
H
2(s)
H
3(s)
(6)
H1(s) +
R2
(R2 ) R1)
(7)
H2(s) + * gm
R
O 1 ) s
C
R
C
1 ) s
C
R
O
1 ) s
C
C2
R
C
(8)
H
3(s) +
(1 ) s
C
O
ESR)
1 ) s
C
O
RL
R
S
(9)
SLUS609H – MAY 2004 – REVISED JULY 2009................................................................................................................................................................ www.ti.com
A buck converter using TPS51116 current mode operation can be partitioned into three portions, a voltage
divider, an error amplifier and a switching modulator. By linearizing the switching modulator, we can derive the
transfer function of the whole system. Since current mode scheme directly controls the inductor current, the
modulator can be linearized as shown in Figure 2.
Figure 2. Linearizing the Modulator
Here, the inductor is located inside the local feedback loop and its inductance does not appear in the small signal
model. As a result, a modulated current source including the power inductor can be modeled as a current source
with its transconductance of 1/RS and the output capacitor represent the modulator portion. This simplified model
is applicable in the frequency space up to approximately a half of the switching frequency. One note is, although
the inductance has no influence to small signal model, it has influence to the large signal model as it limits slew
rate of the current source. This means the buck converter’s load transient response, one of the large signal
behaviors, can be improved by using smaller inductance without affecting the loop stability.
Total open loop transfer function of the whole system is given by Equation 6.
Assuming RL>>ESR, RO>>RC and CC>>CC2, each transfer function of the three blocks is shown starting with
There are three poles and two zeros in H(s). Each pole and zero is given by the following five equations.
18
Copyright 2004–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS51116
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS51116RGERG4 | 功能描述:DC/DC 开关控制器 DDR2 SWITCHER AND LDO 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 |
| TPS51116RGET | 功能描述:DC/DC 开关控制器 DDR2 SWITCHER AND LDO 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 |
| TPS51116RGET | 制造商:Texas Instruments 功能描述:DC/DC CONVERTER IC 制造商:Texas Instruments 功能描述:IC, SYNC BUCK CONTROLLER, VQFN-24 |
| TPS51116RGETG4 | 功能描述:DC/DC 开关控制器 DDR2 SWITCHER AND LDO 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 |
| TPS51117 | 制造商:TI 制造商全称:Texas Instruments 功能描述:SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER |
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