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參數(shù)資料
| 型號： | 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)： | 7/19頁 |
| 文件大小： | 174K |
| 代理商： | SP6122ACU-15 |
7
Date: 10/02/04
SP6122 Low Voltage, Micro 8, PFET, Buck Controller Copyright 2004 Sipex Corporation
Power On Reset (POR): continued
internal 1.25V is greater than the 1 V thresh-
old. Note this is a “l(fā)oose” threshold and should
not be used to guarantee under voltage lock
out with respect to V
CC
. Care should be take
to ensure that V
CC
does not “get stuck” on the
way to its regulated value.
Soft Start
Soft start is required on step-down control-
lers to prevent excess inrush current through
the power train during start-up. On the
SP6122, this is managed through turning
the PFET switch on with a fixed frequency
clock and then turning the switch off when
divided down version of the output voltage
exceeds the internal SS voltage ramp. The
internal SS voltage ramp rises with a 0.5 V/
ms slew rate and the internal feedback
voltage follows this rate of change. The
presence of the output capacitor creates
extra current draw during startup. Since
dV
OUT
/dt creates an average sustained cur-
rent in the output capacitor, this current
must be considered while calculating peak
inrush current and over current thresholds.
An expression to determine the excess in-
rush current due to the dV
OUT
/dt of the
output capacitor is:
IC
OUT
= C
OUT
*0.5 V/ms *
V
OUT
,
V
R
where VR is the internal reference voltage.
Lock Up & Hiccup Modes
As previously stated, if the SP6122 detects
an over current condition and initiates a
fault, the power supply remains “l(fā)ocked up”.
That is, the FFLAG pin immediately pulls
low (if loaded) and the PFET switch turns
off. This condition is permanent unless the
either the V
CC
or ENABLE is cycled. How-
ever if FFLAG is tied to ENABLE, the SP6122
will restart without assistance (Hiccup
Mode). Furthermore, the restart time can be
controlled by the addition of a small capaci-
tor on the ENABLE pin to ground. The
restart time is equal to the amount of time it
takes for the 5
μ
A ENABLE pin current to
charge the external capacitor to an NFET
threshold (roughly 1V). The waveforms that
describe the Hiccup Mode operation are
shown below.
TIME
SWN
V(V
IN
)
0V
Inductor
I
LOAD
0A
Comparator
1.25V
0V
0V
0.25V
SS
dV
SS
/dt = 0.5Vms
VI
SET
- VI
SENSE
0V
1.0V
V(V
CC
)
0V
0V
0V
FFLAG
ENABLE
150mV
TIME
dV
ENABLE
/dt = 4
μ
A/C
ENABLE
PDRV
V(V
CC
)
V(V
CC
)
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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