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L6711 Datasheet(PDF) 35 Page - STMicroelectronics

Part # L6711
Description  3 Phase controller with dynamic VID and selectable DACs
PDF  50 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6711 Datasheet(HTML) 35 Page - STMicroelectronics

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L6711
Output voltage monitor and protections
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14.5
Low side sense overcurrent (CS_SEL=OPEN)
The device detects an Over Current condition for each phase when the current information
IINFOx overcomes the fixed threshold of IOCTH (35µA Typ). When this happens, the device
keeps the relative LS mosfet on, skipping clock cycles, until the threshold is crossed back
and IINFOx results being lower than the IOCTH threshold. This implies that the device limits
the bottom of each inductor current ripple.
After exiting the OC condition, the LS mosfet is turned off and the HS is turned on with a
duty cycle driven by the PWM comparator.
Keeping the LS on, skipping clock cycles, causes the on-time subsequent to the exit from
the OC condition to increase. Considering now that the device, with this kind of current
sense, has maximum on-time dependence with the delivered current given by the following
relationship:
Where IOUT is the output current (IOUT = Σ·IPHASEx) and TSW is the switching period (TSW
=1/FSW).
This linear dependence has a value at zero load of 0.80 ·TSW and at maximum current of
0.40 ·TSW typical and results in two different over current behaviors of the device:
14.5.1
TON Limited output voltage.
This happens when the maximum ON time is reached before that the current in each phase
reaches IOCPx (IINFOx<IOCTH). Figure 17 shows the maximum output voltage that the device
is able to regulate considering the TON limitation imposed by the previous relationship. If the
desired output characteristic crosses the TON limited maximum output voltage, the output
resulting voltage will start to drop after the crossing.
In this case, the device doesn't perform constant current limitation but only limits the
maximum ON time following the previous relationship. The output voltage starts to decrease
follows the resulting characteristic (dotted in Figure 17) until UVP is detected or anyway until
IDROOP =105µA.
Figure 17.
TON limited operation
T
ON,MAX
0.80
I
D ROOP
–
3.8k
⋅
() T
SW =
0.80 T
SW
I
DROOP
0
µA
=
⋅
0.40 T
SW
I
DROOP
105
µA
=
⋅
⎩
⎪
⎨
⎪
⎧
⋅
=
0
.8
0
·V
IN
0
.4
0
·V
IN
V
O
U
T
IO
U
T
IO
C
P
=
3
·IO
C
P
x
(ID
R
O
O
P
=
1
0
5
µ
A
)
T
O
N
L
im
ite
dO
u
tp
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t
c
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0
.8
0
·V
IN
0
.4
0
·V
IN
V
O
U
T
IO
U
T
IO
C
P
=
3
·IO
C
P
x
(ID
R
O
O
P
=
1
0
5
µ
A
)
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ire
dO
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Maximum output Voltage
b) TON Limited Output Voltage



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