參數(shù)資料
型號(hào)： LM3420-42
廠商： National Semiconductor Corporation
英文描述： Lithium-Ion Battery Charge Controller
中文描述： 鋰離子電池充電控制器
文件頁(yè)數(shù)： 11/17頁(yè)
文件大?。?/td> 384K
代理商： LM3420-42
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 I
OUT
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
) 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
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) 75x10
3
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
L
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM3420-8.2 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Lithium-Ion Battery Charge Controller
LM3420-8.4 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Lithium-Ion Battery Charge Controller
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(lèi)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(lèi)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(chēng):MCP73831T-2ACI/OTCT
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