參數(shù)資料
型號(hào)： L6711
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48
封裝： 7 X 7 MM, 1 MM HEIGHT, TQFP-48
文件頁數(shù)： 29/50頁
文件大?。?/td> 679K
代理商： L6711
Obsolete
Product(s)
- Obsolete
Product(s)
L6711
Output voltage monitor and protections
35/50
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 (35A 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 = ΣIPHASEx) 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 =105A.
Figure 17.
TON limited operation
T
ON,MAX
0.80
I
D ROOP
–
3.8k
() T
SW =
0.80 T
SW
I
DROOP
0
A
=
0.40 T
SW
I
DROOP
105
A
=
=
0
.8
0
V
IN
0
.4
0
V
IN
V
O
U
T
IO
U
T
IO
C
P
=
3
IO
C
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x
(ID
R
O
P
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1
0
5
A
)
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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
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(ID
R
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Maximum output Voltage
b) TON Limited Output Voltage
相關(guān)PDF資料
PDF描述
L6714TR SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6711_06 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3 Phase controller with dynamic VID and selectable DACs
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L6712 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER
L6712_05 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER
L6712A 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER
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