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參數(shù)資料
| 型號(hào)： | L6722TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, QCC36 |
| 封裝： | 6 X 6 MM, 1 MM PITCH, VFQFPN-36 |
| 文件頁數(shù)： | 11/34頁 |
| 文件大小： | 421K |
| 代理商： | L6722TR |
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Obsolete
Product(s)
- Obsolete
Product(s)
L6722
7 Output voltage positioning
19/34
Time constant matching between the inductor (L / DCR) and the current reading filter
(
) is required to implement a real equivalent output impedance of the system so
avoiding over and/or under shoot of the output voltage as a consequence of a load transient. In
fact, considering the scheme reported on Figure 9, it is possible to observe that:
By applying the time constant matching concept, it results:
=>
The device forces IDROOP = ICS x 3, proportional to the read current, into the feedback resistor
RFB implementing the load regulation dependence. The output characteristic vs. load current is
then given by (Offset disabled):
Where RLL is the resulting load-line resistance implemented by the system.
The whole power supply can be then represented by a "real" voltage generator with an
equivalent output resistance RLL and a voltage value of VID.
RFB resistor can be then designed according to the RLL specifications as follow:
Warning:
Droop function is operational for output voltages up to 1.8V.
Caution:
Droop function is optional, in case it is not desired, the Current Sense circuit can be tricked so
that the device always read a null current. To do this, it is enough connecting CS+ directly to the
output voltage leaving CS- unconnected. The reaction will keep CS+ and CS- at the same
voltage, always reading a null current and also assuring the FB disconnection protection to be
effective. To aovid setting the FB-disconnection protection, it is also suggested to connect CS+
To disable also the FB disconnection protection, CS+ can be directly connected to VSEN or
SGND.
Figure 9.
Droop function current reading network
R
PH
C
PH
S
I
OUT
3
------------
1s
L
DCR
+
1s
R
PH
C
PH
3
+
-------------------------------------------------------------
DC
R
D
--------
=
L
DCR
-------------
R
PH
C
PH
3
------------------------------
=
I
CS
I
OUT
3
------------
DCR
R
D
-------------
=
OUT
VID
R
FB
I
DROOP
–
VID
R
FB
DCR
R
D
-------------
I
OUT
–
VID
R
LL
I
OU
–
==
=
R
FB
R
LL
R
D
DCR
-------------
=
L2
L1
L3
DCR1
DCR2
DCR3
CPH
R
PH
R
PH
R
PH
RD
PHASE3
PHASE2
PHASE1
VOUT
ICS
CS+
CS-
FB
IDROOP
x 3
RF
CF
RFB
COMP
L2
L1
L3
DCR1
DCR2
DCR3
PHASE3
PHASE2
PHASE1
VOUT
ICS
CS+
CS-
FB
IDROOP
x 3
RF
CF
RFB
COMP
Droop Function Enabled
Droop Function Disabled
R1
R2
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