參數(shù)資料
型號(hào)： L6918
廠商： 意法半導(dǎo)體
英文描述： 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
中文描述： 5位可編程多相控制器
文件頁(yè)數(shù)： 22/35頁(yè)
文件大?。?/td> 760K
代理商： L6918
L6918 L6918A
22/35
Figure 13. Current Sharing Control Loop.
The current sharing between devices uses the droop function. Each device can be modeled with its Thevenin
equivalent circuit (that is an ideal voltage source equal to the programmed voltage by VIDs and its related output
resistance R
OUT
), while the whole converter is modeled by the same ideal voltage source and an equivalent
output resistance R
DROOP
=R
OUT
/2;
Considering this modelization reported in figure 14, it can be seen that the recirculating current between devices
depends on the accuracy of the regulation.
The accuracy of the voltage source is given by the offset of the master error amplifier Vos (6mV typ) and de-
pends on the ratio between this offset and the output voltage variation with load (R
OUT
,I
OUT
). The mismatch
between the regulated voltages causes a converter to source a current that is sunk by the other one. The accu-
racy related to droop resistance depends on precision of feedback current of the device I
FB
, sense resistors
R
SENSE
, Transconductance resistors Rg and feedback resistors R
FB
.
The current sharing error (CSE) results:
I
OUT
OUT
OUT
FB
Considering the external resistors tolerance of 1%, the typical current feedback accuracy of 2.5
μ
A/50
μ
A (5%),
4 phases operation, Error Amplifier offset Vos=6mV, droop resistance R
DROOP
=1.5m
(R
OUT
=2,R
DROOP
) and
I
LOAD
=60A (I
OUT
=I
LOAD
/2), it results:
Figure 14. Equivalent Circuit for current sharing error calculation
L1
L2
+
+
PWM1
1/5
1/5
I
INFO2
I
INFO1
PWM2
COMP
V
OUT
CURRENT
SHARING
DUTY CYCLE
CORRECTION
D02IN1393
CSE
----------------
1
2
--
-------------------------------
2
1
2
--
I
-----------
2
1
2
--
R
FB
--------------
2
2
2
--
R
SENSE
-------------------------
2
4
2
--
R
g
g
----------
2
+
+
+
+
≡
=
CSE
1
2
--
---------------------------------
2
1
2
--
A
μ
A
----------------
2
1
2
--
0.01
(
)
2
2
2
--
0.01
(
)
2
4
2
--
0.01
(
)
2
+
+
+
+
0.062 6.2%
)
=
=
VID
R
DROOP
V
OUT
R
LOAD
I
LOAD
L
L6918
V
OUT
R
OUT
R
OUT
R
LOAD
V
PROG
Recirculating Current
I
LOAD
I
OUT
I
OUT
相關(guān)PDF資料
PDF描述
L6918A 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918AD 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918ADTR 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918D 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918DTR 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6918A 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918AD 功能描述:DC/DC 開(kāi)關(guān)控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6918ADTR 功能描述:DC/DC 開(kāi)關(guān)控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6918D 功能描述:DC/DC 開(kāi)關(guān)控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6918DTR 功能描述:DC/DC 開(kāi)關(guān)控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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