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參數(shù)資料
| 型號： | L6917D |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 14/27頁 |
| 文件大?。?/td> | 411K |
| 代理商： | L6917D |
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L6917
14/27
Figure 7. Current Sharing Error using R
SENSE
as sensing element at 0A (left) and 30A (right)..
Integrated Droop Function
The device uses a droop function to satisfy the requirements of high performance microprocessors, reducing
the size and the cost of the output capacitor.
This method ”recovers” part of the drop due to the output capacitor ESR in the load transient, introducing a de-
pendence of the output voltage on the load current
As shown in figure 8, the ESR drop is present in any case, but using the droop function the total deviation of the
output voltage is minimized. In practice the droop function introduces a static error (Vdroop in figure 8) propor-
tional to the output current. Since the device has anaverage current mode regulation, the information about the
total current delivered is used to implement the Droop Function. This current (equal to the sum of both I
INFOx
)
is sourced from the FB pin. Connecting a resistor between this pin and Vout, the total current information flows
only in this resistor because the compensation network between FB and COMP has always a capacitor in series
(See fig. 9). The voltage regulated is then equal to:
V
OUT
= V
ID
- R
FB
· I
FB
Since I
FB
depends on the current information about the two phases, the output characteristic vs. load current is
given by:
Figure 8. Output transient response without (a) and with (b) the droop function
CH1 = PHASE1; CH2 = PHASE2; CH3 = I
L2
; CH4 = I
L1
V
OUT
VID
R
FB
R
Rg
----------------------
I
OUT
–
=
V
MAX
V
MIN
V
NOM
(a)
(b)
ESR DROP
ESRDROP
V
DROOP
相關PDF資料 |
PDF描述 |
|---|---|
| L6917DTR | Analog IC |
| L6917 | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER |
| L6917B | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER |
| L6917BD | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER |
| L6917BDTR | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 安裝風格: 封裝 / 箱體:CPAK |
| L6918ADTR | 功能描述:DC/DC 開關控制器 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 安裝風格: 封裝 / 箱體:CPAK |
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