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參數(shù)資料
| 型號： | PM6641 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, QCC48 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, LEAD FREE, VQFP-48 |
| 文件頁數(shù)： | 32/47頁 |
| 文件大小： | 2254K |
| 代理商： | PM6641 |
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Components selection
PM6641
38/47
Doc ID 13510 Rev 3
If ceramic capacitors are used, the output voltage ripple due to inductor current ripple is
negligible. Then the inductance could be smaller, reducing the size of the choke. In this case
it is important that output capacitor can adsorb the inductor energy without generating an
overvoltage condition when the system changes from a full load to a no load condition.
The minimum output capacitance can be chosen by the following equation:
Equation 21
where Vf is the output capacitor voltage after the load transient and Vi is the output capacitor
voltage before the load transient.
8.4
SW regulator compensation components selection
As described in section SW regulators control loop, the PM6641 switching regulators control
loop is:
Equation 22
If the output capacitor CO and its equivalent series resistance (ESR) RES provide a low
frequency zero,
, the roll-off compensation pole must be added:
Equation 23
This pole is useful if the fzo zero is greater than about
.
However, the first assumption must relate the cross-over frequency, fCO, with the control
loop gain:
Equation 24
2
MAX
,
LOAD
2
min
,
OUT
Vi
Vf
I
L
C
=
(
)
(
)
()
O
ES
O
ES
O
C
Ro
C
Ro
C
L
m
LOOP
R
1
R
sC
1
R
sC
1
C
R
sC
1
R
sC
K
g
)
s
(
G
+
+
α
=
ES
O
zo
R
C
2
1
f
π
=
C
RO
PRO
R
C
2
1
f
π
5
f
0
C
()
O
ES
O
CO
O
C
L
m
O
ES
O
CO
C
CO
C
CO
L
m
CO
LOOP
R
C
f
2
R
K
g
R
C
f
2
C
f
2
R
C
f
2
K
g
f
2
j
G
+
π
α
=
+
π
π
α
π
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PM6670ASTR | 3 A SWITCHING CONTROLLER, QCC24 |
| PM6670AS | 3 A SWITCHING CONTROLLER, QCC24 |
| PM6670A | 1.4 A SWITCHING CONTROLLER, QCC24 |
| PM6670STR | 3 A SWITCHING CONTROLLER, QCC24 |
| PM6670S | 3 A SWITCHING CONTROLLER, QCC24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PM6641TR | 功能描述:低壓差穩(wěn)壓器 - LDO Monolithic VR RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| PM6644 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 350mA adjust SD reg 4.5V to 25V 350mA RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| PM6644TR | 功能描述:DC/DC 開關(guān)控制器 350 mA adj step-down 4.5 to 25V -40, 150c 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 |
| PM6650 | 制造商:Qualcomm 功能描述:Electronic Component |
| PM6652 | 功能描述:DC/DC 開關(guān)控制器 Single Phase CNTR Intel MVP 6.5 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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