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參數資料
| 型號： | SP6127EK1L |
| 英文描述： | High-Voltage, Step-Down Controller in TSOT6 |
| 中文描述： | 高電壓，降壓型控制器在TSOT6 |
| 文件頁數： | 4/12頁 |
| 文件大?。?/td> | 564K |
| 代理商： | SP6127EK1L |
____________________________________________________
GENERAL OVERVIEW
June 26, 2007 SP6127 TSOT-6 PFET Buck Controller
2007 Sipex Corporation
Page 4
The SP6127 is a fixed frequency, Voltage-mode,
non-synchronous PWM controller optimized for
minimum component, small form factor and cost
effectiveness. It has been designed for single-
supply operation ranging from 4.5V to 29V.
SP6127 has Type-II internal compensation for
use with Electrolytic/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 900kHz.
SP6127 contains useful protection features.
Overcurrent protection is based on the 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.
SP6127 Loop Compensation
The SP6127 includes Type-II internal compensation
components for loop compensation. 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.
Type-II internal compensation is sufficient if the
following condition is met:
f
f
<
………………. (1)
DBPOLE
ESRZERO
where:
OUT
ESR
ESRZERO
C
.
R
f
.
.
1
π
=
……….. (2)
OUT
DBPOLE
C
L
f
=
.
.
1
π
………… (3)
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
combination in parallel with R1 as shown below.
The value of CZ can be calculated as follows and
RZ selected from table 1.
a
series
RC
1
25
.
R
C
L
CZ
×
=
………….. (4)
Table1- Selection of
R
Z
f
ESRZERO
/
f
DBPOLE
1X
2X
3X
5X
>= 10X
R
Z
50K
40K
30K
10K
2K
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SP6127EK1-L | 功能描述:DC/DC 開關控制器 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 |
| SP6127EK1L/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High-Voltage, Step-Down Controller in TSOT6 |
| SP6127EK1-L/TR | 功能描述:電壓模式 PWM 控制器 High-Voltage Step Down Controller RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6128A | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6128A_05 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
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