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參數(shù)資料
| 型號： | PM6680A |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, VFQFPN-32 |
| 文件頁數(shù)： | 25/48頁 |
| 文件大?。?/td> | 1932K |
| 代理商： | PM6680A |
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PM6680A
Design guidelines
31/48
Equation 14
If hard saturation inductors are used, the inductor saturation current should be much greater
than the maximum inductor peak current Ipeak:
Equation 15
Using soft saturation inductors it's possible to choose inductors with saturation current limit
nearly to Ipeak.
Below there is a list of some inductor manufacturers.
9.3
Output capacitor
The selection of the output capacitor is based on the ESR value Rout and the voltage rating
rather than on the capacitor value Cout.
The output capacitor has to satisfy the output voltage ripple requirements. Lower inductor
value can reduce the size of the choke but increases the inductor current ripple
IL.
Since the voltage ripple VRIPPLEout is given by:
Equation 16
A low ESR capacitor is required to reduce the output voltage ripple. Switching sections can
work correctly even with 20 mV output ripple.
However, to reduce jitter noise between the two switching sections it's preferable to work
with an output voltage ripple greater than 30 mV. If lower output ripple is required, a further
compensation network is needed (see Closing the integrator loop paragraph).
Finally the output capacitor choice deeply impacts on the load transient response (see Load
transient response paragraph). Below there is a list of some capacitor manufacturers.
Table 10.
Inductor manufacturer
Manufacturer
Series
Inductor value
(uH)
RMS current
(A)
Saturation current
(A)
COILCRAFT
MSS1038
1.5 to 22
2.85 to 7.85
2.9 to 8.30
COILCRAFT
MSS7341
3.3 to 22
1.7 to 3.95
1.3 to 3.5
WURTH
TPC
1 to 22
H
2.7 to 8
2.6 to 9.5
max
IN
OUT
sw
OUT
max
IN
L
V
L
f
V
(max)
I
×
=
2
(max)
I
(max)
I
Ipeak
L
LOAD
+
=
L
out
RIPPLEout
I
R
V
×
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PM6680ATR | 功能描述:DC/DC 開關(guān)控制器 Dual sync 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 |
| PM6680TR | 功能描述:DC/DC 開關(guān)控制器 No Rsense dual StepDwn 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 |
| PM6681A | 功能描述:DC/DC 開關(guān)控制器 Dual Synch CTRLR Adj Voltage LDO 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 |
| PM6681A_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual synchronous step-down controller with adjustable LDO |
| PM6681ATR | 功能描述:DC/DC 開關(guān)控制器 DUAL STEP-DOWN CONTROLLER W/ADJ LDO 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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