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| 型号： | TPS59116RGET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, VQFN-24 |
| 文件页数： | 7/36页 |
| 文件大小： | 827K |
| 代理商： | TPS59116RGET |
第1页第2页第3页第4页第5页第6页当前第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
H(s) + H1(s)
H
2(s)
H
3(s)
H1(s) +
R2
(R2 ) R1)
H2(s) + * gm
R
O 1 ) s
C
R
C
1 ) s
C
R
O
1 ) s
C
C2
R
C
H
3(s) +
(1 ) s
C
O
ESR)
1 ) s
C
O
RL
R
S
w
P1 +
1
C
R
O
w
P2 +
1
C
O
RL
TI Information — Selective Disclosure
www.ti.com
SLUSA57 – NOVEMBER 2010
APPLICATION INFORMATION
Loop Compensation and External Parts Selection
Current Mode Operation
A buck converter using TPS59116 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 the 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.
(6)
Assuming RL>>ESR, RO>>RC and CC>>CC2, each transfer function of the three blocks is shown starting with
(7)
(8)
(9)
There are three poles and two zeros in H(s). Each pole and zero is given by the following five equations.
(10)
(11)
Copyright 2010, Texas Instruments Incorporated
15
Product Folder Link(s): TPS59116
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