參數(shù)資料
型號(hào)： LTC4000IUFD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC28
封裝： 4 X 5 MM, LEAD FREE, PLASTIC, MO-220WXXX-X, QFN-28
文件頁(yè)數(shù)： 18/40頁(yè)
文件大小： 428K
代理商： LTC4000IUFD#TRPBF
LTC4000
25
4000f
Figure 12. Empirical Loop Compensation Setup
IOUT
VIN
CSN
CSP
IN
CLN
BAT
GND
LTC4000
50
1W
50
GENERATOR
f = 50Hz
RC
ITH
GND
SWITCHING
CONVERTER
4000 F12
BGATE
ITH
CC
CC
1000F
(OBSERVE
POLARITY)
SCOPE
GROUND
CLIP
10k
A
1k
1500pF
0.015F
B
applicaTions inForMaTion
Generator frequency is set at 50Hz. Lower frequencies
may cause a blinking scope display and higher frequen-
cies may not allow sufficient settling time for the output
transient. Amplitude of the generator output is typically
set at 5VP-P to generate a 100mAP-P load variation. For
lightly loaded outputs (IOUT < 100mA), this level may be
too high for small signal response. If the positive and
negative transition settling waveforms are significantly
different, amplitude should be reduced. Actual amplitude
is not particularly important because it is the shape of
the resulting regulator output waveform which indicates
loop stability.
A 2-pole oscilloscope filter with f = 10kHz is used to
block switching frequencies. Regulators without added
LC output filters have switching frequency signals at their
outputs which may be much higher amplitude than the
low frequency settling waveform to be studied. The filter
frequency is high enough for most applications to pass
the settling waveform with no distortion.
Oscilloscope and generator connections should be made
exactly as shown in Figure 12 to prevent ground loop er-
rors. The oscilloscope is synced by connecting the chan-
nelB probe to the generator output, with the ground clip
of the second probe connected to exactly the same place
as channel A ground. The standard 50Ω BNC sync output
of the generator should not be used because of ground
loop errors. It may also be necessary to isolate either
the generator or oscilloscope from its third wire (earth
ground) connection in the power plug to prevent ground
loop errors in the scope display. These ground loop errors
are checked by connecting channel A probe tip to exactly
the same point as the probe ground clip. Any reading on
channel A indicates a ground loop problem.
Once the proper setup is made, finding the optimum
values for the frequency compensation network is fairly
straightforward. Initially, CC is made large (≥1μF) and RC
is made small (≈10k). This nearly always ensures that the
regulator will be stable enough to start iteration. Now, if
the regulator output waveform is single-pole over damped
(see the waveforms in Figure 13), the value of CC is re-
duced in steps of about 2:1 until the response becomes
slightly under damped. Next, RC is increased in steps of
2:1 to introduce a loop zero. This will normally improve
damping and allow the value of CC to be further reduced.
Shifting back and forth between RC and CC variations will
allow one to quickly find optimum values.
相關(guān)PDF資料
PDF描述
LTC4075XEDD 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
LTC4075XEDD#PBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
LTC4095EDC#TR 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
LTC4095EDC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
LTC4095EDC#TRM 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4001 制造商:LINER 制造商全稱:Linear Technology 功能描述:2A Synchronous Buck Li-Ion Charger
LTC4001-1 制造商:LINER 制造商全稱:Linear Technology 功能描述:2A Synchronous Buck Li-Ion Charger
LTC4001EUF 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 2000mA 4.2V 16-Pin QFN EP
LTC4001EUF#PBF 功能描述:IC CHARGER LI-ION BUCK 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2
LTC4001EUF#TRPBF 功能描述:IC CHARGER LI-ION BUCK 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*