參數(shù)資料
型號： L6918ADTR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28
封裝： SO-28
文件頁數(shù)： 17/35頁
文件大?。?/td> 431K
代理商： L6918ADTR
L6918 L6918A
24/35
while placing the zero in correspondence with the L-C resonance a simple -20dB/dec shape of the gain is as-
sured (See Figure 15). In fact, considering the usual value for the output filter, the LC resonance results to be
at frequency lower than the above reported zero.
Figure 15. ACM Control Loop Gain Block Diagram (left) and Bode Diagram (right).
Compensation network can be simply designed placing
ωZ=ωLC and imposing the cross-over frequency ωT as
desired obtaining:
In a four phase operation (since the four phase converter is realized by two dual phase converters in parallel
that shares current using droop), also the other sub-system in parallel must be considered. In particular, in the
above reported relationships, it must be considered with Co and ESR the total output capacitance and equiva-
lent ESR while the output impedance Zo of the other sub-system must be considered in parallel to the output
capacitance Co and to the load Ro.
The output impedance of the other sub-system in parallel results:
Considering Zo in parallel to Ro, it can be verified that the RF and CF design relationships are still valid.
LAYOUT GUIDELINES
Since the device manages control functions and high-current drivers, layout is one of the most important things
to consider when designing such high current applications.
A good layout solution can generate a benefit in lowering power dissipation on the power paths, reducing radi-
ation and a proper connection between signal and power ground can optimize the performance of the control
loops.
Integrated power drivers reduce components count and interconnections between control functions and drivers,
reducing the board space.
Here below are listed the main points to focus on when starting a new layout and rules are suggested for a cor-
rect implementation.
dB
ω
T
ω
Z
ω
LC
GLOOP
ZF(s)
K
4
5
---
V
IN
V
osc
---------------
1
R
FB
----------
dB
=
Rout
Cout
ESR
L/2
RFB
RF
CF
REF
PWM
IFB
VCOMP
VOUT
d
VIN
ZF
R
F
R
FB
V
OSC
V
IN
----------------------------------
5
4
---
ω
T
L
2R
DROOP
ESR
+
()
-------------------------------------------------------
=
C
F
Co
L
2
---
R
F
--------------------
=
Zo s
()
Z
L s
()
4
5
---
V
IN
V
OSC
-------------------
Rsense
Rg
---------------------- Z
F s
()
+
1
4
5
---
V
IN
V
OSC
-------------------
Z
F s
()
R
FB
---------------
+
-----------------------------------------------------------------------------------------------
=
相關(guān)PDF資料
PDF描述
L6918AD SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28
L6919CD SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28
L6919E SWITCHING CONTROLLER, PDSO28
L6920DTR 1.2 A SWITCHING REGULATOR, PDSO8
L6920D 1.2 A SWITCHING REGULATOR, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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L6918DTR 功能描述:DC/DC 開關(guān)控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK
L6919 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
L6919C 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
L6919CD 功能描述:DC/DC 開關(guān)控制器 Prog Dual-Phase Cont RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK
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