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參數資料
| 型號： | PM6670S |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, QCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, VFQFPN-24 |
| 文件頁數： | 37/54頁 |
| 文件大?。?/td> | 742K |
| 代理商： | PM6670S |
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Application information
PM6670S
42/54
Doc ID 14432 Rev 4
The saturation current of the inductor should be greater than IL,PEAK not only in case of hard
saturation core inductors. Using soft-ferrite cores it is possible (but not advisable) to push
the inductor working near its saturation current.
In Table 13 some inductors suitable for notebook applications are listed.
In pulse-skip mode, low inductance values produce a better efficiency versus load curve,
while higher values result in higher full-load efficiency because of the smaller current ripple.
8.1.2
Input capacitor selection
In a buck topology converter the current that flows through the input capacitor is pulsed and
with zero average value. The RMS input current can be calculated as follows:
Equation 33
Neglecting the second term, the equation 10 is reduced to:
Equation 34
The losses due to the input capacitor are thus maximized when the duty-cycle is 0.5:
Equation 35
The input capacitor should be selected with a RMS rated current higher than ICINRMS(max).
Tantalum capacitors are good in terms of low ESR and small size, but they occasionally can
burn out if subjected to very high current during operation. Multi-layers-ceramic-capacitors
(MLCC) have usually a higher RMS current rating with smaller size and they remain the best
choice. The drawback is their quite high cost.
Table 13.
Evaluated inductors (@fsw = 400 kHz)
Manufacturer
Series
Inductance (H)
+40 °C rms
current (A)
-30 % saturation
current (A)
COILCRAFT
MLC1538-102
1
13.4
21.0
COILCRAFT
MLC1240-901
0.9
12.4
24.5
COILCRAFT
MVR1261C-112
1.1
20
WURTH
7443552100
1
16
20
COILTRONICS
HC8-1R2
1.2
16.0
25.4
2
L
2
LOAD
RMS
Cin
)
I
(
D
12
1
)
D
1
(
D
I
Δ
+
=
)
D
1
(
D
I
LOAD
RMS
Cin
=
2
LOAD
Cin
2
CinRMS
Cin
loss
(max))
I
5
.
0
(
ESR
(max)
I
ESR
P
=
=
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| PM6670TR | 功能描述:直流/直流開關調節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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| PM6675AS | 功能描述:DC/DC 開關控制器 DDR 2/3 Memory Pwr Cntrl RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| PM6675ASTR | 功能描述:低壓差控制器 - LDO Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負載調節(jié): 輸出類型:Adjustable, Fixed 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
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