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参数资料
| 型号： | SP6126EB |
| 厂商： | Exar Corporation |
| 文件页数： | 4/14页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6126 |
| 标准包装： | 1 |
| 系列： | * |
GENERAL OVERVIEW
The SP6126 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. SP6126 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
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.
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-
CZ =
L ? C
R 1
………….. (4)
peak) ramp and generates the PWM control.
Timing is governed by an internal oscillator that
sets the PWM frequency at 600kHz.
SP6126 contains useful protection features.
Over-current protection is based on high-side
MOSFET’s Rds(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.
SP6126 Loop Compensation
f ESRZERO ÷ f DBPOLE
1X
2X
3X
5X
>= 10X
RZ
50K
40K
30K
10K
2K
The SP6126 includes Type-II internal
compensation components for loop
compensation. External compensation
components are not required for systems with
tantalum or aluminum electrolytic output
Table1- Selection of RZ
capacitors with sufficiently high ESR. Use the
condition below as a guideline to determine
whether or not the internal compensation is
SP6126
Vout
sufficient for your design.
CP1
2pF
RZ
Type-II internal compensation is sufficient if the
following condition is met:
CZ2
130pF
RZ2
200k
CZ
R1
200k, 1%
f ESRZERO < f DBPOLE ………………. (1)
VFB
where:
Error Amplif ier
Vref =0.6V
R2
f ESRZERO =
1
2 . π . R ESR . C OUT
……….. (2)
Figure 1- RZ and CZ in conjunction with
f DBPOLE =
1
2 . π . L ? C OUT
………… (3)
internal compensation components form
a Type-III compensation
Nov07 -08 Rev G
SP6126: TSOT-6 PFET Buck Controller
4
? 200 8 Exar Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6126EK1 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6126EK1L | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6126EK1-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 |
| SP6126EK1L/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6126EK1-L/TR | 功能描述:电压模式 PWM 控制器 High-Voltage Step Down Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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