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參數(shù)資料
| 型號： | 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)： | 2/17頁 |
| 文件大?。?/td> | 241K |
| 代理商： | L6911DTR |
Obsolete
Product(s)
- Obsolete
Product(s)
L6911D
10/17
The worst condition depends on the input voltage available and the output voltage selected. Anyway the worst
case is the response time after removal of the load with the minimum output voltage programmed and the max-
imum input voltage available.
Output Capacitor
Since the microprocessors require a current variation beyond 10A doing load transients, with a slope in the
range of tenth A/
sec, the output capacitor is a basic component for the fast response of the power supply. In
fact for first few microseconds they supply the current to the load. The controller recognizes immediately the
load transient and sets the duty cycle at 100%, but the current slope is limited by the inductor value.
The output voltage has a first drop due to the current variation inside the capacitor (neglecting the effect of the
ESL):
VOUT = IOUT ESR
A minimum capacitor value is required to sustain the current during the load transient without discharge it. The
voltage drop due to the output capacitor discharge is given by the following equation:
Where DMAX is the maximum duty cycle value that is 100%. The lower is the ESR, the lower is the output drop
during load transient and the lower is the output voltage static ripple.
Input Capacitor
The input capacitor has to sustain the ripple current produced during the on time of the upper MOS, so it must
have a low ESR to minimize the losses. The rms value of this ripple is:
Where D is the duty cycle. The equation reaches its maximum value with D=0.5. The losses in worst case are:
Compensation network design
The control loop is a voltage mode (figure 7) that uses a droop function to satisfy the requirements for a VRM
module, 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: at light load the output voltage will be higher than the nom-
inal level, while at high load the output voltage will be lower than the nominal value.
t
a pplic atio n
L
I
V
IN
V
OUT
–
------------------------------
=
t
rem ov al
L
I
V
OUT
---------------
=
V
OUT
I
OUT
2
L
2C
OU T
V
IN M IN
D
MAX
V
OUT
–
()
---------------------------------------------------------------------------------------------
=
I
rm s
I
OUT
D1
D
–
()
=
P
ESR I
rm s
2
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6911E | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6911ETR | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6924U013 | POWER SUPPLY SUPPORT CKT, PQCC16 |
| L6924U013TR | POWER SUPPLY SUPPORT CKT, PQCC16 |
| L6924U | POWER SUPPLY SUPPORT CKT, QCC16 |
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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