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| 型号： | L6706 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, QCC40 |
| 封装： | 6 X 6 MM, ROHS COMPLIANT, VFQFPN-40 |
| 文件页数： | 36/47页 |
| 文件大小： | 623K |
| 代理商： | L6706 |
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L6706
System control loop compensation
Doc ID 15698 Rev 2
41/47
desired crossover frequency
ω
T. Neglecting the effect of ZF(s), the transfer function has one
zero and two poles; both the poles are fixed once the output filter is designed (LC filter
resonance
ω
LC) and the zero (ωESR) is fixed by ESR and the droop resistance.
Figure 24.
Equivalent control loop block diagram (left) and bode diagram (right)
To obtain the desired shape an RF - CF series network is considered for the ZF(s)
implementation. A zero at
ω
F = 1/RFCF is then introduced together with an integrator. This
integrator minimizes the static error while placing the zero
ω
F in correspondence with the L-
C resonance assures a simple -20 dB/dec shape of the gain.
In fact, considering the usual value for the output filter, the LC resonance results to be at
frequency lower than the above reported zero.
Compensation network can be simply designed placing
ω
F = ωLC and imposing the cross-
over frequency
ω
T as desired obtaining (always considering that ωT might be not higher than
1/10th of the switching frequency FSW):
Moreover, it is suggested to filter the high frequency ripple on the COMP pin adding also a
capacitor between COMP pin and FB pin (it does not change the system bandwidth):
VREF
FB
COMP
VSEN
FBG
RF
CF
RFB
PWM
L
ESR
CO
RO
d VOUT
VOUT
ZF(s)
ZFB(s)
I DR
OOP
dB
ω
ZF(s)
GLOOP(s)
K
ω
LC = ωF
ω
ESR
ω
T
RF[dB]
CP
R
F
R
FB
ΔV
OSC
V
IN
----------------------------------
5
3
---
ω
T
L
R
DROOP
ESR
+
()
-----------------------------------------------
=
C
F
C
O
L
R
F
--------------------
=
C
P
1
2
π R
F
SW
---------------------------------------
=
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| L6709TR | 功能描述:功率驱动器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6710 | 功能描述:功率驱动器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6710TR | 功能描述:功率驱动器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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