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參數(shù)資料
| 型號： | PM6685TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32 |
| 文件頁數(shù)： | 29/52頁 |
| 文件大?。?/td> | 2536K |
| 代理商： | PM6685TR |
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PM6685
Monitoring and protections
35/52
8.8
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 14
A low ESR capacitor is required to reduce the output voltage ripple. Switching sections can
work correctly even with 20mV output ripple.
However, to reduce jitter noise between the two switching sections it’s preferable to work
with an output voltage ripple greater than 30mV. 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.
8.9
Input capacitors selection
In a buck topology converter the current that flows into the input capacitor is a pulsed current
with zero average value. The input RMS current of the two switching sections can be roughly
estimated as follows:
Equation 15
Where D1, D2 are the duty cycles and I1, I2 are the maximum load currents of the two
sections.
Input capacitor should be chosen with an RMS rated current higher than the maximum RMS
current given by both sections.
Table 12.
Output capacitor manufacturer
Manufacturer
Series
Capacitor value
(
F)
Rated voltage (V)
ESR max (m
)
SANYO
POSCAP
TPB,TPD
150 to 330
4 to 6.3
35 to 65
PANASONIC
SPCAP UD, UE
150 to 220
4 to 6.3
9 to 18
L
out
RIPPLEout
I
R
V
×
=
)
D
1
(
I
D
)
D
1
(
I
D
I
2
1
2
1
CinRMS
×
+
×
=
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PDF描述 |
|---|---|
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| PMB2304T | PLL FREQUENCY SYNTHESIZER, 220 MHz, PDSO14 |
| PMB2306R | PLL FREQUENCY SYNTHESIZER, 120 MHz, PDSO16 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PM6686 | 制造商:STMicroelectronics 功能描述: |
| PM6686TR | 功能描述:DC/DC 開關(guān)控制器 Step-down Controller w/adj. voltages-dual 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 安裝風格: 封裝 / 箱體:CPAK |
| PM6-6F-L | 功能描述:端子 Metric Fork Terminal non-insulated, 4.0 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點電鍍:Tin over Nickel 觸點材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp |
| PM6-6R-D | 制造商:Panduit Corp 功能描述: |
| PM6-6R-L | 功能描述:端子 Metric Ring Terminal non-insulated, 2.5 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點電鍍:Tin over Nickel 觸點材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp |
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