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參數(shù)資料
| 型號(hào)： | LM340K-12 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 3-Terminal Positive Regulators |
| 中文描述： | 12 V FIXED POSITIVE REGULATOR, MBFM2 |
| 封裝： | METAL CAN, TO-3, 2 PIN |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 205K |
| 代理商： | LM340K-12 |
LM340, A Series
13
MOTOROLA ANALOG IC DEVICE DATA
VOLTAGE REGULATOR PERFORMANCE
The performance of a voltage regulator is specified by its
immunity to changes in load, input voltage, power dissipation,
and temperature. Line and load regulation are tested with a
pulse of short duration (< 100
μ
s) and are strictly a function of
electrical gain. However, pulse widths of longer duration
(> 1.0 ms) are sufficient to affect temperature gradients
across the die. These temperature gradients can cause a
change in the output voltage, in addition to changes caused
by line and load regulation. Longer pulse widths and thermal
gradients make it desirable to specify thermal regulation.
Thermal regulation is defined as the change in output
voltage caused by a change in dissipated power for a
specified time, and is expressed as a percentage output
voltage change per watt. The change in dissipated power can
be caused by a change in either input voltage or the load
current. Thermal regulation is a function of IC layout and die
attach techniques, and usually occurs within 10 ms of a
change in power dissipation. After 10 ms, additional changes
in the output voltage are due to the temperature coefficient of
the device.
Figure 1 shows the line and thermal regulation response of
a typical LM340AT–5.0 to a 10 W input pulse. The variation of
the output voltage due to line regulation is labeled
à
and the
thermal regulation component is labeled
á
. Figure 2 shows
the load and thermal regulation response of a typical
LM340AT–5.0 to a 15 W load pulse. The output voltage
variation due to load regulation is labeled
à
and the thermal
regulation component is labeled
á
.
2
1
2
1
V
I
V
V
Vout = 5.0 V
Vin = 7.5 V
Iout = 1.0 A
CO = 0
TJ = 25
°
C
Vin – Vout = 5.0 V
Iout = 100 mA
Figure 1. Line and Thermal Regulation
Figure 2. Load and Thermal Regulation
LM340AT–5.0
Vout = 5.0 V
Vin = 15 V
Iout = 0 A
→
1.5 A
→
0 A
= Regline = 4.4 mV
= Regtherm = 0.0020% VO/W
t, TIME (2.0 ms/DIV)
C
V
(
1
2
2.0
0
LM340AT–5.0
Vout = 5.0 V
Vin = 8.0 V
→
18 V
→
8.0 V
Iout = 1.0 A
= Regline = 2.4 mV
= Regtherm = 0.0030% VO/W
t, TIME (2.0 ms/DIV)
V
V
(
1
2
18 V
8.0 V
2
2
Figure 3. Temperature Stability
Figure 4. Output Impedance
1.02
1.00
0.98
–90
–50
–10
TJ, JUNCTION TEMPERATURE (
°
C)
30
70
110
150
190
N
100
10–1
10–2
10–3
10–4
1.0
10
100
1.0 k
f, FREQUENCY (Hz)
10 k
100 k
1.0 M
10 M
100 M
1.01
0.99
Z
,
)
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PDF描述 |
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| LM340K-15 | 3-Terminal Positive Regulators |
| LM340MPX-5.0 | 3-Terminal Positive Regulators |
| LM340S-12 | 3-Terminal Positive Regulators |
| LM340S-5.0 | 3-Terminal Positive Regulators |
| LM340T-12 | Series 3-Terminal Positive Regulators |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM340K-12 | 制造商:Texas Instruments 功能描述:IC V REG +12V TO-3-2 340 |
| LM340K-12/NOPB | 功能描述:IC REG LDO 12V 1A TO-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:500 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:12V 輸入電壓:14.5 V ~ 35 V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:500mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:TO-205AD，TO-39-3 金屬罐 供應(yīng)商設(shè)備封裝:TO-39 包裝:散裝 其它名稱:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| LM340K127812P+ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3-Terminal Positive Regulators |
| LM340K15 | 制造商:Motorola 功能描述:_ 制造商:NATIONAL 功能描述:New |
| LM340K-15 | 制造商:Motorola 功能描述:_ 制造商:Motorola Inc 功能描述: 制造商:Texas Instruments 功能描述: 制造商: 功能描述: 制造商:undefined 功能描述: 制造商:Texas Instruments 功能描述:IC V REG +15V TO-3-2 340 |
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