參數(shù)資料
型號(hào)： LM3420A-4.2MWA
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC
封裝： WAFER
文件頁(yè)數(shù)： 3/21頁(yè)
文件大?。?/td> 468K
代理商： LM3420A-4.2MWA
Compensation (Continued)
portant when analyzing closed loop stability. The minimum
and maximum room temperature values of this resistor are
specified in the Electrical Characteristics section of this data
sheet, and a curve showing the temperature coefficient is
shown in the curves section. Minimum values of R
f result in
lower phase margins.
Test Circuit
The test circuit shown in
Figure 2 can be used to measure
and verify various LM3420 parameters. Test conditions are
set by forcing the appropriate voltage at the V
OUT Set test
point and selecting the appropriate R
L or IOUT as specified in
the Electrical Characteristics section. Use a DVM at the
“measure” test points to read the data.
V
REG External Voltage Trim
The regulation voltage (V
REG) of the LM3420 can be exter-
nally trimmed by adding a single resistor from the COMP pin
to the +IN pin or from the COMP pin to the GND pin, depend-
ing on the desired trim direction. Trim adjustments up to
±10% of V
REG can be realized, with only a small increase in
the temperature coefficient. (See temperature coefficient
curve shown in
Figure 3 below.)
Formulas for selecting trim resistor values are shown below,
based on the percent of increase (%incr) or percent of de-
crease (%decr) of the output voltage from the nominal volt-
age.
For LM3420-4.2
R
increase = 22x10
5/%incr
R
decrease = (53x10
5/%decr) 75x103
For LM3420-8.2
DS012359-7
FIGURE 2. LM3420 Test Circuit
DS012359-8
Normalized Temperature Drift with
Output Externally Trimmed
DS012359-9
Increasing V
REG
DS012359-10
Decreasing V
REG
FIGURE 4. Changing V
REG
LM3420-4.2/LM3420-8.2/LM3420-8.4/LM3420-12.6/LM3420-16.8
www.national.com
11
相關(guān)PDF資料
PDF描述
LM3420A-4.2MDA 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC
LM3420A16.8MWA 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC
LM3420A12.6MWA 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC
LM3420A-8.4MDA 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC
LM3420A16.8MDA 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM3420AL-4.2 DIE 制造商:Texas Instruments 功能描述:
LM3420AL-8.2 WAF 制造商:Texas Instruments 功能描述:
LM3420AM5-12.6 功能描述:IC CTRLR LIION BAT CHRG SOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT
LM3420AM5-12.6/NOPB 制造商:Texas Instruments 功能描述:Battery Charger Li-Ion 15mA 12.6V 5-Pin SOT-23 T/R
LM3420AM5-16.8 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lithium-Ion Battery Charge Controller
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