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參數(shù)資料
| 型號(hào)： | LM3420M5X-8.2 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Lithium-Ion Battery Charge Controller |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | MINIATURE, SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 11/17頁(yè) |
| 文件大?。?/td> | 384K |
| 代理商： | LM3420M5X-8.2 |
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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
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11
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