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參數(shù)資料
| 型號(hào)： | L6911DTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | SO-20 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 241K |
| 代理商： | L6911DTR |
Obsolete
Product(s)
- Obsolete
Product(s)
11/17
L6911D
Figure 6. Output transient response without (a) and with (b) the droop function
As shown in figure 6, 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 6) propor-
tional to the output current. Since a sense resistor is not present, the output DC current is measured by using
the intrinsic resistance of the inductance (a few m
). So the low-pass filtered inductor voltage (that is the induc-
tor current) is added to the feedback signal, implementing the droop function in a simple way. Referring to the
schematic in figure 7, the static characteristic of the closed loop system is:
Where VPROG is the output voltage of the digital to analog converter (i.e. the set point) and RL is the inductance
resistance. The second term of the equation allows a positive offset at zero load (
V+); the third term introduces
the droop effect (
VDROOP). Note that the droop effect is equal the ESR drop if:
Figure 7. Compensation network
Considering the previous relationships R2, R3, R8 and R9 may be determined in order to obtain the desired
droop effect as follow:
s
Choose a value for R2 in the range of hundreds of K
to obtain realistic values for the other
components.
VMAX
VMIN
VNOM
(a)
(b)
ESR DROP
VDROOP
V
OUT
V
PRO G
V
PRO G
R3
R 8 // R9
+
R2
-------------------------------------
R
L
R8 // R9
R8
----------------------------------- I
OUT
–
+
=
R
L
R8 // R9
R8
-----------------------------------
ESR
=
C1 8
C2 0
R 4
R3
R9
L2
ES R
C6 - 1 5
R8
R2
PW M
C2 5
V IN
V PR O G
R L
Z F
Z I
V OU T
V PH ASE
V CO M P
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6911E | 功能描述:DC/DC 開關(guān)控制器 5-Bit Prog Step-Down 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 |
| L6911E_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5-Bit programmable step down controller with synchronous rectification |
| L6911ETR | 功能描述:DC/DC 開關(guān)控制器 5B PROGRAMMABLE STEP DOWN CONTROLLER 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 |
| L6912-2 | 制造商:Thomas & Betts 功能描述:1/2 CORD GRIP CONNECTOR,2/BG |
| L6913-1 | 制造商:Thomas & Betts 功能描述:1/2 CORD GRIP CONNECTOR,1/BG |
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