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參數(shù)資料
| 型號： | LM79M15CT |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 3-Terminal Negative Regulators |
| 中文描述： | 15 V FIXED NEGATIVE REGULATOR, PSFM3 |
| 封裝： | PLASTIC, TO-220, 3 PIN |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 211K |
| 代理商： | LM79M15CT |
Design Considerations
The
LM79MXX
fixed
thermal-overload protection from excessive power, internal
short-circuit protection which limits the circuit’s maximum
current, and output transistor safe-area compensation for
reducing the output current as the voltage across the pass
transistor is increased.
Although the internal power dissipation is limited, the junc-
tion temperature must be kept below the maximum specified
temperature in order to meet data sheet specifications. To
calculate the maximum junction temperature or heat sink
required, the following thermal resistance values should be
used:
voltage
regulator
series
have
Package
θ
JC
(C/W)
3
θ
JA
(C/W)
40
TO-220
(1)
θ
CA
Solving for T
J
:
T
J
= T
A
+ P
D
(
θ
JC
+
θ
CA
) or
= T
A
=+ P
D
θ
JA
(Without a Heat Sink)
Where
J
= Junction Temperature
T
A
= Ambient Temperature
P
D
= Power Dissipation
θ
JC
= Junction-to-Case Thermal Resistance
θ
CA
= Case-to-Ambient Thermal Resistance
θ
CS
= Case-to-Heat Sink Thermal Resistance
θ
SA
= Heat Sink-to-Ambient Thermal Resistance
θ
JA
= Junction-to-Ambient Thermal Resistance
=
θ
CS
+
θ
SA
Typical Applications
Bypass capacitors are necessary for stable operation of the
LM79MXX series of regulators over the input voltage and
output current ranges. Output bypass capacitors will improve
the transient response of the regulator.
The bypass capacitors (2.2μF on the input, 1.0μF on the
output), should be ceramic or solid tantalum which have
good high frequency characteristics. If aluminum electrolyt-
ics are used, their values should be 10μF or larger. The
bypass capacitors should be mounted with the shortest
leads, and if possible, directly across the regulator terminals.
Fixed Regulator
DS010483-2
*
Required if regulator is separated from filter capacitor by more than 3".
For value given, capacitor must be solid tantalum. 25μF aluminum
electrolytic may be substituted.
Required for stability. For value given, capacitor must be solid tantalum.
25μF aluminum electrolytic may be substituted. Values given may be
increased without limit.
For output capacitance in excess of 100μF, a high current diode from input
to output (1N4001, etc.) will protect the regulator from momentary input
shorts.
Variable Output
DS010483-3
*Improves transient response and ripple rejection.
Do not increase beyond 50μF.
Select R2 as follows:
LM79M05C
LM79M12C
LM79M15C
300
750
1k
L
www.national.com
6
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM79M15CT | 制造商:Texas Instruments 功能描述:IC REGULATOR -15V |
| LM79M15CT/NOPB | 功能描述:IC REG LDO -15V .5A TO220-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:1 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標準）:0.28V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:5-VFBGA 供應(yīng)商設(shè)備封裝:5-uSMD 包裝:Digi-Reel® 其它名稱:LP2985AIBP-4.0DKR |
| LM79M15R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Negative Fixed Voltage Regulator |
| LM79M18 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Negative Fixed Voltage Regulator |
| LM79M18R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Negative Fixed Voltage Regulator |
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