參數(shù)資料
型號: LM261J
英文描述: Analog Comparator
中文描述: 模擬比較器
文件頁數(shù): 15/19頁
文件大?。?/td> 2317K
代理商: LM261J
Application Information
Setting The Output Voltage
The LM2612 features pin-selectable output voltage to elimi-
nate the need for external feedback resistors. Select an
output voltage of 1.05V, 1.3V, 1.5V or 1.8V by configuring the
VID0 and VID1 pins, as directed in
Table 1
.
TABLE 1. VID0 and VID1 Output Voltage Selection Settings
V
OUT
(V)
Logic Level
VID0
0
0
1
1
VID1
1
0
0
1
1.8
1.5
1.3
1.05
VID0 and VID1 are digital inputs. They may be set high by
connecting to VDD or low by connecting to SGND. Option-
ally, VID0 and VID1 may be driven by digital gates that
provide over 1.3V for a high state and less than 0.4V for a
low state to ensure valid logic levels. The VID0 and VID1
inputs each have an internal 1.8 μApull-down that pulls them
low for a default 1.5V output when left unconnected. Leaving
these pins open is acceptable, but setting the pins high or
low is recommended.
Inductor Selection
A 10μH inductor with a saturation current rating greater than
the max current limit of the device is recommended for most
applications. The inductor’s resistance should be less than
0.3
for good efficiency.
Table 2
lists suggested inductors
and suppliers.
TABLE 2. Suggested Inductors and Their Suppliers
Model
Vendor
Phone
FAX
DO1608C-103
DO1606T-103
UP1B-100
UP0.4CB-100
ELL6GM100M
ELL6PM100M
P1174.103T
P0770.103T
CDRH5D18-100
CDRH4D28-100
CDC5D23-100
NP05D B100M
NP04S B100N
SLF6025T-100M1R0
SLF6020T-100MR90
A918CY-100M
A915AY-100M
Coilcraft
Coilcraft
Coiltronics
Coiltronics
Panasonic
Panasonic
Pulse Engineering
Pulse Engineering
Sumida
Sumida
Sumida
Taiyo Yuden
Taiyo Yuden
TDK
TDK
Toko
Toko
847-639-6400
847-639-1469
561-241-7876
561-241-9339
714-373-7366
714-373-7323
858-674-8100
858-674-8100
847-956-0666
858-674-8262
858-674-8262
847-956-0702
847-925-0888
847-925-0899
847-803-6100
847-803-6296
847-297-0070
847-699-7864
For low-cost applications, an unshielded bobbin inductor is
suggested. For noise critical applications, a toroidal or
shielded-bobbin inductor should be used. A good practice is
to lay out the board with overlapping footprints of both types
for design flexibility. This allows substitution of a low-noise
toroidal inductor, in the event that noise from low-cost bobbin
models is unacceptable.
The saturation current rating is the current level beyond
which an inductor loses its inductance. Beyond this rating,
the inductor loses its ability to limit current through the PFET
switch to a ramp and allows the switch current to increase
rapidly. This can cause poor efficiency, regulation errors or
stress to DC-DC converters like the LM2612. Saturation
occurs when the magnetic flux density from current through
the windings of the inductor exceeds what the inductor’s
core material can support with energy storage in a corre-
sponding magnetic field.
L
www.national.com
15
相關(guān)PDF資料
PDF描述
LM2636M Voltage-Mode SMPS Controller
LM2636MTC Voltage-Mode SMPS Controller
LM2636MTCX Voltage-Mode SMPS Controller
LM2636MX Voltage-Mode SMPS Controller
LM2637
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2621 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Input Voltage, Step-Up DC-DC Converter
LM2621_05 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Input Voltage, Step-Up DC-DC Converter
LM2621EVAL 功能描述:EVALUATION BOARD FOR LM2621 RoHS:是 類別:編程器,開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC(離線)SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC,步升 輸出及類型:1,非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
LM2621EVAL/NOPB 功能描述:電源管理IC開發(fā)工具 EVAL BOARDFOR LM2621 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
LM2621MM 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK