參數(shù)資料
型號： L6740L
廠商： STMICROELECTRONICS
元件分類： 模擬信號調理
英文描述： SPECIALTY ANALOG CIRCUIT, PQFP48
封裝： 7 X 7 MM, 1 MM HEIGHT, HTQFP-48
文件頁數(shù)： 32/44頁
文件大?。?/td> 755K
代理商： L6740L
System control loop compensation
L6740L
Figure 17.
Control loop bode diagram and fine tuning (not in scale)
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
1/10 th of the switching frequency FSW):
9.1
Compensation network guidelines
The compensation network design assures to having system response according to the
cross-over frequency selected and to the output filter considered: it is anyway possible to
further fine-tune the compensation network modifying the bandwidth in order to get the best
response of the system as follow (See Figure 17):
–
Increase RF to increase the system bandwidth accordingly;
–
Decrease RF to decrease the system bandwidth accordingly;
–
Increase CF to move ωF to low frequencies increasing as a consequence the
system phase margin.
Having the fastest compensation network gives not the confidence to satisfy the
requirements of the load: the inductor still limits the maximum dI/dt that the system can
afford. In fact, when a load transient is applied, the best that the controller can do is to
“saturate” the duty cycle to its maximum (dMAX) or minimum (0) value. The output voltage
dV/dt is then limited by the inductor charge / discharge time and by the output capacitance.
In particular, the most limiting transition corresponds to the load removal since the inductor
results being discharged only by VOUT (while it is charged by dMAXVIN-VOUT during a load
appliance).
dB
ω
ZF(s)
GLOOP(s)
K
ω
LC = ωF
ω
ESR
ω
T
RF[dB]
dB
ω
ZF(s)
GLOOP(s)
K
ω
LC = ωF
ω
ESR
ω
T
RF[dB]
RF
CF
R
F
R
FB
ΔV
OSC
V
IN
----------------------------------
9
10
------
ω
T
L
NR
LL
ESR
+
()
-------------------------------------------
=
C
F
C
O
L
R
F
--------------------
=
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相關代理商/技術參數(shù)
參數(shù)描述
L6740LTR 功能描述:DC/DC 開關控制器 Hybrid controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
L6741 功能描述:功率驅動器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
L6741TR 功能描述:功率驅動器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
L6743 功能描述:功率驅動器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
L6743_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:High current MOSFET driver
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