參數(shù)資料
型號： L6711TR
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(shù)模轉換器
文件頁數(shù)： 26/38頁
文件大?。?/td> 591K
代理商： L6711TR
L6711
26/38
since the current ripple increases. In fact, the ON time increases due to the OFF time rise because of the
current has to reach the I
OCPx
bottom. The worst-case condition is when the ON time reaches its maximum
value.
When this happens, the device works in Constant Current and the output voltage decrease as the load
increase. Crossing the UVP threshold causes the device to latch driving high the OSC pin (Figure 19
shows this working condition).
It can be observed that the peak current (Ipeak) is greater than I
OCPx
but it can be determined as follow:
Where Vout
MIN
is the UVP threshold, (inductor saturation must be considered). When that threshold is
crossed, all mosfets are turned off, the FAULT pin is driven high and the device stops working. Cycle the
power supply or the OUTEN pin to restart operation.
The maximum average current during the Constant-Current behavior results:
In this particular situation, the switching frequency for each phase results reduced. The ON time is the
maximum allowed (T
onMAX
) while the OFF time depends on the application:
The transconductance resistor Rg can be designed considering that the device limits the bottom of the
inductor current ripple and also considering the additional current delivered during the quasi-constant-cur-
rent behavior as previously described in the worst case conditions.
Moreover, when designing D-VID compatible systems, the additional current due to the output filter charge
during dynamic VID transitions must be considered.
where
Figure 19. Constant Current operation
13.3 INDUCTOR SENSE (CS_SEL = SGND) OVER CURRENT
The device detects an over current when the I
INFOx
overcome the fixed threshold I
OCTH
. Since the device
always senses the current across the inductor, the I
OCTH
crossing will happen during the HS conduction
time: as a consequence of OCP detection, the device will turn OFF the HS mosfet and turns ON the LS
I
PEAK
I
OCPx
V
----------–
Ton
MAX
Vout
L
+
I
OCPx
V
----------–
0.40 T
SW
Vout
L
+
=
=
I
MAX,TOT
3 I
MAX
3
I
OCPx
Ipeak
--------------------------------------
I
–
2
+
=
=
T
OFF
L
Ipeak
-------------------------------------
I
–
V
out
=
T
onMax
T
OFF
+
----------------------------------------
=
Rg
I
-----------------------------------------------------------------------
R
I
OCTH min
)
)
=
I
OCPx
I
3
)
---------------------------
I
2
-----------
–
I
3
--------------
+
=
TonMAX
TonMAX
I
OCPx
Ipeak
I
MAX
Vout
Iout
3·I
OCPx
(I
DROOP
=105
μ
A)
I
MAX,TOT
UVP
Droop effect
a) Maximum current for each phase b) Output Characteristic
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相關代理商/技術參數(shù)
參數(shù)描述
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L6712_05 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER
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L6712AD 功能描述:開關變換器、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 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6712ADTR 功能描述:開關變換器、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 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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