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參數(shù)資料
| 型號： | LM7800C |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Series 3-Terminal Positive Regulators |
| 中文描述： | 系列三端穩(wěn)壓器正 |
| 文件頁數(shù)： | 1/15頁 |
| 文件大?。?/td> | 512K |
| 代理商： | LM7800C |
LM140/LM340A/LM340/LM7800C
Series 3-Terminal Positive Regulators
General Description
The LM140/LM340A/LM340/LM7800C monolithic 3-terminal
positive voltage regulators employ internal current-limiting,
thermal shutdown and safe-area compensation, making
them essentially indestructible. If adequate heat sinking is
provided, they can deliver over 1.0Aoutput current. They are
intended as fixed voltage regulators in a wide range of appli-
cations including local (on-card) regulation for elimination of
noise and distribution problems associated with single-point
regulation. In addition to use as fixed voltage regulators,
these devices can be used with external components to ob-
tain adjustable output voltages and currents.
Considerable effort was expended to make the entire series
of regulators easy to use and minimize the number of exter-
nal components. It is not necessary to bypass the output, al-
though this does improve transient response. Input bypass-
ing is needed only if the regulator is located far from the filter
capacitor of the power supply.
The 5V, 12V, and 15V regulator options are available in the
steel TO-3 power package. The LM340A/LM340/LM7800C
series is available in the TO-220 plastic power package, and
the LM340-5.0 is available in the SOT-223 package, as well
as the LM340-5.0 and LM340-12 in the surface-mount
TO-263 package.
Features
n
Complete specifications at 1A load
n
Output voltage tolerances of
±
2% at T
= 25C and
±
4%
over the temperature range (LM140A/LM340A)
n
Line regulation of 0.01% of V
OUT
/V of
V
IN
at 1A load
(LM140A/LM340A)
n
Load regulation of 0.3% of V
OUT
/A (LM140A/LM340A)
n
Internal thermal overload protection
n
Internal short-circuit current limit
n
Output transistor safe area protection
n
P
+
Product Enhancement tested
Device
Output
Voltages
5, 12,
15
5, 12,
15
Packages
LM140
TO-3 (K)
LM340A/LM340
TO-3 (K), TO-220 (T),
SOT-223 (MP), TO-263 (S)
(5V and 12V only)
TO-220 (T)
LM7800C
5, 8, 12,
15
Typical Applications
Fixed Output Regulator
DS007781-1
*
Required if the regulator is located far from the power supply filter.
reAlthough no output capacitor is needed for stability, it does help transient
Adjustable Output Regulator
DS007781-2
V
OUT
= 5V + (5V/R1 + I
Q
) R2 5V/R1
>
3 I
Q
,
load regulation (L
r
)
≈
[(R1 + R2)/R1] (L
r
of LM340-5).
Current Regulator
DS007781-3
I
Q
= 1.3 mA over line and load changes.
Comparison between SOT-223 and D-Pak (TO-252)
Packages
DS007781-38
Scale 1:1
May 1999
L
1999 National Semiconductor Corporation
DS007781
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM7800-SMD | 制造商:SEME-LAB 制造商全稱:Seme LAB 功能描述:POSITIVE VOLTAGE REGULATOR TO 220 M |
| LM7805 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:X78XX系列是三端正電源穩(wěn)壓電路，它的封裝形式為TO-220.它有一系列固定的電壓輸出，應(yīng)用非常廣泛。每種類型由于內(nèi)部電流的限制，以及過熱保護和安全工作區(qū)的保護，使它基本上不會損壞。如果能夠提供足夠的散熱片，它們就能夠提供大于1.5A輸出電流。雖然是招安照固定電壓值來設(shè)計的，但是當接入適當?shù)耐獠科骷?，就能獲得各種不同的電壓和電流。 |
| LM7805-220M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| LM7805A | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:3-TERMINAL 1A POSITIVE VOLTAGE REGULATORS |
| LM7805A-220M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage Regulator |
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