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參數(shù)資料
| 型號(hào)： | L6919 |
| 英文描述： | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
| 中文描述： | 5位可編程雙相與動(dòng)態(tài)VID管理控制器 |
| 文件頁數(shù)： | 14/32頁 |
| 文件大?。?/td> | 558K |
| 代理商： | L6919 |
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L6919C
14/32
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 (V
DROOP
in figure 8) propor-
tional to the output current. Since the device has an average 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 V
OUT
, 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
Figure 9. Active Droop Function Circuit
The feedback current is equal to 50
μ
A at nominal full load (I
FB
= I
INFO1
+ I
INFO2
) and 70
μ
A at the OC intervention
threshold, so the maximum output voltage deviation is equal to:
V
FULL_POSITIVE_LOAD
= -R
FB
· 50
μ
A
V
OC_INTERVENTION
= -R
FB
· 70
μ
A
Droop function is provided only for positive load; if negative load is applied, and then I
INFOx
< 0, no current is
sunk from the FB pin. The device regulates at the voltage programmed by the VID.
V
OUT
VID
R
FB
R
Rg
---------------------
I
OUT
–
=
V
MAX
V
MIN
V
NOM
(a)
(b)
ESR DROP
ESR DROP
V
DROOP
V
PROG
COMP
FB
To VOUT
I
FB
R
FB
Z
F
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6919C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
| L6919CD | 功能描述:DC/DC 開關(guān)控制器 Prog Dual-Phase Cont 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 |
| L6919CDTR | 功能描述:DC/DC 開關(guān)控制器 Prog Dual-Phase Cont 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 |
| L6919E | 功能描述:DC/DC 開關(guān)控制器 5-Bit Dual Ph Contlr 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 |
| L6919ETR | 功能描述:DC/DC 開關(guān)控制器 5-Bit Dual Ph Contlr 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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