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参数资料
| 型号： | SP6125EB |
| 厂商： | Exar Corporation |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6125 |
| 标准包装： | 1 |
| 系列： | * |
General Overview
The SP6125 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. SP6125 has Type-II internal
compensation for use with Electrolytic or
Type-II internal compensation is sufficient if the
following condition is met:
f ESRZERO < f DBPOLE ………………. (1)
where:
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
f ESRZERO =
f DBPOLE =
1
2 . π . R ESR . C OUT
1
2 . π . L ? C OUT
……….. (2)
………… (3)
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.
CZ =
L ? C
1 . 3 × R 1
……………………….. (4)
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 Type-II internal
compensation components for loop compen-
sation. External compensation components are
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.
f ESRZERO ÷f DBPOLE RZ
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.
1X
2X
3X
5X
>= 10X
50K
40K
30K
10K
2K
Table1- Selection of RZ
Jan28-08 RevG
SP6125: TSOT-6 PFET Buck Controller
4
? 2007 Exar Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6125EK1L | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6125EK1-L | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SP6125EK1-L/TR | 功能描述:电源管理IC开发工具 High-Voltage Step Down Controller RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| SP6125EK1L/TR1 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6126 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
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