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參數(shù)資料
| 型號(hào)： | LM2698 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大小： | 503K |
| 代理商： | LM2698 |
Operation
(Continued)
The goal of the compensation network is to provide the best
static and dynamic performance while insuring stability over
line and load variations. The relationship of stability and
performance can be best analyzed by plotting the magnitude
and phase of the open loop frequency response in the form
of a bode plot. A typical bode plot of the LM2698 open loop
frequency response is shown in Figure 5
Poles are marked with an ’X’, and zeros are marked with a
’O’. The bolded ’
O
’ labeled ’f
’ is a right-half plane zero.
Right half plane zeros act like normal zeros to the magnitude
(+20dB/decade slope influence) and like poles to the phase
(90 shift). Three curves are shown. The powerstage curve
is the frequency response of the powerstage, which includes
the switch, diode, inductor, output capacitor, and load. The
compensator curve is the frequency response of the com-
pensator, which is the error amp combined with the compen-
sation network. T is the product of the powerstage and the
compensator and is the complete open loop frequency re-
sponse. The power stage response is fixed by line and load
constraints, while the compensator is set by the external
compensation network at pin 1. The compensator can be
designed in a few simple steps as follows.
Quick Compensator Design
Calculate:
where,
where R
OUT
= 875k
Choose C
C1
= 4.7nF
Choose
Where,
20012657
FIGURE 5. Bode plot of the LM2698 Frequency Response using the Typical Application Circuit
L
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| LM2698EVAL | 功能描述:電源管理IC開發(fā)工具 EVAL BOARDFOR LM2698 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 |
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| LM2698MM-ADJ/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.35A BOOST REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM2698MM-ADJ/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
| LM2698MMX-ADJ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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