參數資料
型號： L6711
廠商： 意法半導體
英文描述： 3 PHASE CONTROLLER WITH DYNAMIC VID AND SELECTABLE DACs
中文描述： 3相控制器，動態(tài)VID和可選數模轉換器
文件頁數： 24/38頁
文件大小： 591K
代理商： L6711
L6711
24/38
device turn-on threshold and the PreOVP turn on threshold and depends also on the OUTEN pin status
as detailed in Figure 17 - left.
A simple way to provide protection to the output in all conditions when the device is OFF (then avoiding
the unprotected red region in Figure 17) consists in supplying the controller through the 5V
SB
bus as
shown in Figure 17 - right.
Both Over Voltage and Under Voltage are active also during soft start (see the relevant section).
Figure 17. Output Voltage Protections and typical principle connections to assure complete
protection.
13 OVERCURRENT PROTECTION
Depending on the current reading method selected, the device limits the peak or the bottom of the inductor
current entering in constant current until setting UVP as below explained.
The Over Current threshold has to be programmed, by designing the Rg resistors, to a safe value, in order
to be sure that the device doesn't enter OCP during normal operation of the device. This value must take
into consideration also the extra current needed during the Dynamic VID Transition I
D-VID
and, since the
device reads across mosfets R
dsON
or inductor DCR, the process spread and temperature variations of
these sensing elements.
Moreover, since also the internal threshold spreads, the Rg design must consider its minimum value
I
OCTH(min)
as follow:
where I
OCP
x is the current measured by the current reading circuitry when the device enters Quasi Con-
stant Current (LS Mosfet Sense) or Constant Current (Inductor Sense), I
OCPx
must be calculated starting
from the corresponding output current value I
OUT(OCP)
as follow (I
D-VID
must also be considered when
D-VID are implemented):
where I
OUT(OCP)
is still the output current value at which the device enters Quasi Constant Current (LS
Mosfet Sense) or Constant Current (Inductor Sense),
I
PP
is the inductor current ripple in each phase and
I
D-VID
is the additional current required by D-VID (when applicable). In particular, since the device limits
the peak or the valley of the inductor current (according to CS_SEL status), the ripple entity, when not
negligible, impacts on the real OC threshold value and must be considered.
Vcc
PreOVP TurnON
Vcc TurnON
Preliminary OVP Enabled
FBR Monitored
No Protection
Provided
(OUTEN = 1)
Programmable OVP
VSEN Monitored
(OUTEN = 0)
Preliminary OVP
FBR Monitored
VCC
VCCDR1
VCCDR2
VCCDR3
+12V
+5V
SB
Rg
I
-----------------------------------------------------------------------
R
I
OCTH min
)
)
=
I
OCPx
=
I
3
I
3
)
----------------------------
I
2
I
2
----------
I
3
I
3
--------------
Low Side Mosfet Sense
+
–
)
----------------------------
----------
--------------
Inductor DCR Sense
+
+
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