參數(shù)資料
型號(hào)： L6712D
廠商： 意法半導(dǎo)體
英文描述： TWO-PHASE INTERLEAVED DC/DC CONTROLLER
中文描述： 兩相交錯(cuò)DC / DC控制器
文件頁數(shù)： 21/27頁
文件大?。?/td> 1074K
代理商： L6712D
21/27
L6712A L6712
Considering now that in the application of interest it can be assumed that R
o
>>R
L
; ESR<<R
o
and
R
DROOP
<<R
o
, it results:
Figure 14. ACM Control Loop Gain Block Diagram (left) and Bode Diagram (right).
The ACM control loop gain is designed to obtain a high DC gain to minimize static error and cross the 0dB
axes with a constant -20dB/dec slope with the 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 and the zero is fixed by ESR and the Droop resistance.
To obtain the desired shape an R
F
-C
F
series network is considered for the Z
F
(s) implementation. A zero
at
ω
F
=1/R
F
C
F
is then introduced together with an integrator. This integrator minimizes the static error
while placing the zero in correspondence with the L-C resonance a simple -20dB/dec shape of the gain is
assured (See Figure 14). 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
Z
=
ω
LC
and imposing the cross-over frequency
ω
T
as desired obtaining:
Voltage Mode (VM) Control Loop (DROOP = SGND)
Disconnecting the DROOP pin from the Control Loop, the system topology becomes a Voltage Mode. The
simplest way to compensate this loop still keeping the same compensation network consists in placing the
RF-CF zero in correspondence with the L-C filter resonance.
The loop gain becomes now:
G
LOOP
s
( )
4
5
--
V
V
OSC
-------------------
Z
s
R
FB
--------------
1
s Co
R
------------------------
ESR
+
+
s
2
Co
L
2
--
s
2 Ro
---------------
Co ESR
Co
2 Ro
---------------
+
+
1
+
+
------------------------------------------------------------------------------------------------------------------------------------------
RA_Gain
–
=
Rout
Cout
ESR
L/2
R
FB
R
F
C
F
VID
PWM
I
DROOP
V
COMP
V
OUT
d
V
IN
Z
F
FB
DROOP
COMP
RA_Gain
dB
ω
ω
T
ω
Z
ω
LC
G
LOOP
Z
F
(s)
K
dB
FB
OSC
IN
R
1
V
V
5
4
K
=
R
F
R
V
V
IN
----------------------------------
5
4
--
ω
T
2
RA_Gain
------------------------
ESR
+
---------------------------------------------------------
C
F
Co
L
2
--
R
F
-------------------
=
=
G
LOOP
s
( )
V
V
OSC
------------------
Z
s
R
FB
--------------
Z
s
( )
Z
L
s
+
Z
P
s
( )
------------------------------------
RA_Gain
–
=
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L6712DTR TWO-PHASE INTERLEAVED DC/DC CONTROLLER
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L6712Q 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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