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參數(shù)資料
| 型號： | L6917BDTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER |
| 中文描述： | 5位可編程雙相控制器 |
| 文件頁數(shù)： | 13/27頁 |
| 文件大?。?/td> | 411K |
| 代理商： | L6917BDTR |
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13/27
L6917
CurrentSharing
Active current sharing is implemented using the information from transconductance differential amplifier in an
average current mode control scheme. A current reference equal to the average of the read current (I
AVG
) is
internally built;the error between theread current and this reference is converted to a voltage with a proper gain
and it is used to adjust the duty cycle whose dominant value is set by the error amplifier at COMP pin.
The current sharing control is a high bandwidth control allowing current sharing even during load transients.
The current sharing error is affected by the choose of external components; choose precise Rg resistor (
±
1%
is necessary) to sense the current. The current sharing error is internally dominated by the voltage offset of
transconductance differential amplifier; considering a voltage offset equal to 2mV across the sense resistor, the
current reading error is given by the following equation:
I
I
MAX
R
SENSE
I
MAX
Where
I
READ
is the difference between one phase current and the ideal current (I
MAX
/2).
For Rsense=4m
and Imax=40A the current sharing error is equal to 2.5%, neglecting errors due to Rg and
Rsense mismatches.
Figures 6 and 7 show the current sharing error obtained at 0A and 30A using a sense resistor or the low side
mosfet’s R
dsON
as sensing element. The static error obtained using the R
dsON
is due to the tolerance of this
parameter (up to 30%).
Figure 6. Current Sharing Error using R
dsON
as sensing element at 0A (left) and 30A (right).
--------------------
----------------------------------------
=
CH1 = PHASE1; CH2 = PHASE2; CH3 = I
L2
; CH4 = I
L1
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相關(guān)代理商/技術(shù)參數(shù) |
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| L6917D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| L6917DTR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| L6918 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
| 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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