- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358844 > LM3420 (National Semiconductor Corporation) Lithium-Ion Battery Charge Controller PDF資料下載
參數(shù)資料
| 型號： | LM3420 |
| 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 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 384K |
| 代理商： | LM3420 |
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
相關PDF資料 |
PDF描述 |
|---|---|
| LM345K-5.0 | Negative Three Amp Regulator |
| LM345 | Negative Three Amp Regulator |
| LM3475 | Hysteretic PFET Buck Controller |
| LM3475MF | Hysteretic PFET Buck Controller |
| LM3475MFX | Hysteretic PFET Buck Controller |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM3420-12.6 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lithium-Ion Battery Charge Controller |
| LM3420-16.8 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lithium-Ion Battery Charge Controller |
| LM3420-4.2 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lithium-Ion Battery Charge Controller |
| LM3420-42 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lithium-Ion Battery Charge Controller |
| LM3420-8.2 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lithium-Ion Battery Charge Controller |
發(fā)布緊急采購，3分鐘左右您將得到回復。