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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 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大小： | 536K |
| 代理商： | SP6125 |
Mar22-07 RevC SP6125: TSOT-6 PFET Buck Controller
2007 Sipex Corporation
4
The SP6125 is a fixed frequency, Voltage-
mode,
non-synchronous
optimized for minimum component, small form
factor and cost effectiveness. It has been
designed for single-supply operation ranging
from 4.5V to 29V. SP6125 has Type-II internal
compensation for use with Electrolytic or
Tantalum output capacitors. For ceramic
capacitors Type-III compensation can be
implemented by simply adding an R and C
between output and Feedback. A precision
0.6V reference, present on the positive terminal
of the Error Amplifier, permits programming of
the output voltage down to 0.6V via the FB pin.
The output of the Error Amplifier is internally
compared to a feed-forward (V
IN
/5 peak-to-
peak) ramp and generates the PWM control.
Timing is governed by an internal oscillator that
sets the PWM frequency at 300kHz.
SP6125 contains useful protection features.
Overcurrent protection is based on high-side
MOSFET’s R
DS(ON)
and is programmable via a
resistor placed at LX node. Under-Voltage
Lock-Out (UVLO) ensures that the controller
starts functioning only when sufficient voltage
exists for powering IC’s internal circuitry.
SP6125 Loop Compensation
The
SP6125
includes
compensation components for loop compen-
sation. External compensation components are
not required for systems with tantalum or
aluminum electrolytic output capacitors with
sufficiently high ESR. Use the condition below
as a guideline to determine whether or not the
internal compensation is sufficient for your
design.
PWM
controller
Type-II
internal
Type-II internal compensation is sufficient if the
following condition is met:
f
f
<
DBPOLE
ESRZERO
………………. (1)
where:
OUT
ESR
ESRZERO
C
.
R
f
.
.
1
π
=
……….. (2)
OUT
DBPOLE
C
L
f
=
.
.
1
π
………… (3)
1
R
C
L
CZ
=
……………………….. (4)
Creating a Type-III compensation Network
The above condition requires the ESR zero to
be at a lower frequency than the double-pole
from the LC filter. If this condition is not met,
Type-III compensation should be used and can
be accomplished by placing a series RC
combination in parallel with R1 as shown
below. The value of CZ can be calculated as
follows and RZ selected from table 1.
Table1- Selection of RZ
f
ESRZERO
÷f
DBPOLE
RZ
1X
2X
3X
5X
>= 10X
50K
40K
30K
10K
2K
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開發(fā)工具 Eval Board for SP6125 Series RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型: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 開關(guān)控制器 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 |
| SP6125EK1-L/TR | 功能描述:電源管理IC開發(fā)工具 High-Voltage Step Down Controller RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型: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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