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參數(shù)資料
| 型號(hào)： | SP6125 |
| 英文描述： | High-Voltage, Step Down Controller in TSOT6 |
| 中文描述： | 高電壓，降壓控制器在TSOT6步 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 536K |
| 代理商： | SP6125 |
Mar22-07 RevC SP6125: TSOT-6 PFET Buck Controller
2007 Sipex Corporation
8
This causes an overshoot in output voltage that
is corrected by power switch reduced duty
cycle. Use the following equation to calculate
C
OUT
:
×
=
Vos
Where:
L is the output inductance
I
2 is the step load high current
I
1 is the step load low current
Vos is output voltage including overshoot
V
OUT
is steady state output voltage
Output voltage undershoot calculation is more
complicated. Test results for SP6125 buck
circuits show that undershoot is approximately
equal to overshoot. Therefore above equation
provides a satisfactory method for calculating
C
OUT
.
Select ESR such that output voltage ripple
(V
RIP
) specification is met. There are two
components to V
RIP
: First component arises
from charge transferred to and from C
OUT
during each cycle. The second component of
V
RIP
is due to inductor ripple current flowing
through output capacitor’s ESR. It can be
calculated from:
-
2
2
Vout
1
2
I
I
L
Cout
2
2
8
1
×
×
+
×
=
fs
Cout
ESR
Irip
Vrip
Where:
I
RIP
is inductor ripple current
f
s is switching frequency
C
OUT
is output capacitor calculated above
Note that a smaller inductor results in a higher
I
RIP
, therefore requiring a larger C
OUT
and/or
lower ESR in order to meet V
RIP
.
Input Capacitor Selection
Select
the
Capacitance, ripple current, ESR and ESL.
Voltage rating is nominally selected to be twice
the input voltage. The RMS value of input
capacitor current, assuming a low inductor
ripple current (Irip), can be calculated from:
Iout
Icin
×
=
input
capacitor
for
Voltage,
(
)
D
D
1
In general total input voltage ripple should be
kept below 1.5% of V
IN
(not to exceed 180mV).
Input voltage ripple has three components:
ESR and ESL cause a step voltage drop upon
turn on of the MOSFET. During on time
capacitor discharges linearly as it supplies
I
OUT
-
I
IN
. The contribution to Input voltage ripple by
each term can be calculated from:
Vout
Iout
Cin
V
=
(
×
)
2
,
Vin
Cin
fs
Vout
Vin
×
(
(
×
×
)
Irip
Iout
ESR
ESR
V
5
,
=
)
Trise
Irip
Iout
ESL
ESL
V
5
,
=
Where Trise is the rise time of current through
capacitor
Total input voltage ripple is sum of the above:
Cin
V
Tot
V
,
,
+
=
In circuits where converter input voltage is
applied via a mechanical switch excessive
ringing may be present at turn-on that may
interfere with smooth startup of SP6126.
Addition of an inexpensive 100
μ
F Aluminum
Electrolytic capacitor at the input will help
reduce ringing and restore a smooth startup.
ESL
V
ESR
V
,
,
+
General Overview
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP6125EK1L | High-Voltage, Step Down Controller in TSOT6 |
| SP6126_1 | Evaluation Board Manual |
| SP6126EB | Evaluation Board Manual |
| SP6126EK1 | Evaluation Board Manual |
| SP6126 | High-Voltage, Step Down Controller in TSOT6 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6125EB | 功能描述:電源管理IC開(kāi)發(fā)工具 Eval Board for SP6125 Series RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| SP6125EK1L | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6125EK1-L | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| SP6125EK1-L/TR | 功能描述:電源管理IC開(kāi)發(fā)工具 High-Voltage Step Down Controller RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| SP6125EK1L/TR1 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
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