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| 型號(hào)： | SP6122ACU-15 |
| 英文描述： | Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters |
| 中文描述： | 低電壓，微8，PFET的，降壓控制器適合第1A至5A，占地面積小，DC - DC電源轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/19頁 |
| 文件大小： | 174K |
| 代理商： | SP6122ACU-15 |
10
Date: 10/02/04
SP6122 Low Voltage, Micro 8, PFET, Buck Controller Copyright 2004 Sipex Corporation
Guidelines for Component Selection
GENERAL
The SP6122 is a minimum on-time PFM
controller. This means there is no error amp
controlling the loop. Although an internal
algorithm adjusts the on-time approximate
the performance of a fixed frequency con-
troller, the loop control is generated by
looking at OUTPUT RIPPLE. The peak to
peak value of this output ripple must be no
less than 2% of the DC output voltage in
order to maintain reasonable fixed frequency
operation. In addition, as with all PFM con-
trollers, board layout is critical and careful
attention must be paid to minimize paths
that can generate noise. Fortunately, the
SP6122 is designed for simplicity and minimal
external components, making it easy to de-
sign small, quiet power converters up to 12W.
INDUCTOR SELECTION
In a SP6122 application, the main factors
for choosing an inductor are likely to be
cost, size, saturation current and efficiency.
If you use low inductor values, you get the
smallest size, but you may cause larger
ripple currents and poor efficiency and re-
quire more output capacitance to smooth
the output ripple. Increasing the inductor
value will decrease the output voltage ripple
but degrade the transient response. For a
good compromise between size, losses and
cost, set the inductor ripple current between
20% to 40% of the maximum output current.
The inductor operating point and switching
frequency determine the inductor value as
seen in the following expression:
L = (V
OUT
+ V
DIODE
)*(V
IN
– V
OUT
)/
((V
IN
+ V
DIODE
)*(
F
S
K
R
I
OUT(max)
))
Where F
S
= switching frequency (see Soft
Start Frequency Specification)
K
R
= ratio of the ac inductor ripple current to
the maximum output current
V
DIODE =
forward Schottky diode voltage
For an application with 1.9V out, 4A maxi-
mum I
OUT
, 3.3V input supply, 400 mV typical
forward diode voltage, 300kHz frequency
and a 30% inductor ripple current, a 2.2
μ
H
inductor was selected (see Table 1 SP6122
Component Selection).
The peak to peak inductor ripple current is:
I
PP
= (V
OUT
+ V
DIODE
)*(V
IN
– V
OUT
)/
((V
IN
+ V
DIODE
)*(
F
S
L))
For that same 2.2
μ
H inductor application,
the I
PP
= 1.32A.
The inductor must be selected to not satu-
rate the core at the peak inductor current:
I
PEAK
= I
OUT(max)
+ I
PP
/2
Data For Evaluation Board:
continued
Figure 3. SP6122 Load Regulation with Input
Voltage = 3.3V.
Figure 4. SP6122 Line Regulation with I
LOAD
= 2A.
1.897
1.898
1.899
1.900
1.901
1.902
0
1
2
3
4
5
V
O
I
LOAD
(A)
1.899
1.900
1.901
1.903
1.904
1.905
3
4
5
6
V
O
I
LOAD
(A)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP6122CU | Evaluation Board Manual |
| SP6122EB | Evaluation Board Manual |
| SP6122UEB | Evaluation Board Manual |
| SP6122ACU-1.5 | Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters |
| SP6122 | Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6122ACU-15/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters |
| SP6122ACU-L | 功能描述:DC/DC 開關(guān)控制器 Low Voltage, Micro 8 PFET 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 |
| SP6122ACU-L/TR | 功能描述:DC/DC 開關(guān)控制器 Low Voltage, Micro 8 PFET 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 |
| SP6122ACU-L-1-5 | 制造商:Exar Corporation 功能描述:BUCK CONTROLLER LOW VOLT PFET 6122 |
| SP6122CU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
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