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LM337T 参数 Datasheet PDF下载

LM337T图片预览
型号: LM337T
PDF下载: 下载PDF文件 查看货源
内容描述: 三端可调负稳压器 [3-Terminal Adjustable Negative Regulators]
分类和应用: 稳压器
文件页数/大小: 12 页 / 834 K
品牌: NSC [ NATIONAL SEMICONDUCTOR ]
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LM137/LM337 3-Terminal Adjustable Negative Regulators
November 2004
LM137/LM337
3-Terminal Adjustable Negative Regulators
General Description
The LM137/LM337 are adjustable 3-terminal negative volt-
age regulators capable of supplying in excess of −1.5A over
an output voltage range of −1.2V to −37V. These regulators
are exceptionally easy to apply, requiring only 2 external
resistors to set the output voltage and 1 output capacitor for
frequency compensation. The circuit design has been opti-
mized for excellent regulation and low thermal transients.
Further, the LM137 series features internal current limiting,
thermal shutdown and safe-area compensation, making
them virtually blowout-proof against overloads.
The LM137/LM337 serve a wide variety of applications in-
cluding local on-card regulation, programmable-output volt-
age regulation or precision current regulation. The LM137/
LM337 are ideal complements to the LM117/LM317
adjustable positive regulators.
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Excellent thermal regulation, 0.002%/W
77 dB ripple rejection
Excellent rejection of thermal transients
50 ppm/˚C temperature coefficient
Temperature-independent current limit
Internal thermal overload protection
P
+
Product Enhancement tested
Standard 3-lead transistor package
Output is short circuit protected
LM137 Series Packages and Power Capability
Rated
Device
LM137/337
Package
TO-3 (K)
TO-39 (H)
LM337
LM337
TO-220 (T)
SOT-223
(MP)
Power
Dissipation
20W
2W
15W
2W
Design
Load
Current
1.5A
0.5A
1.5A
1A
Features
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Output voltage adjustable from −1.2V to −37V
1.5A output current guaranteed, −55˚C to +150˚C
Line regulation typically 0.01%/V
Load regulation typically 0.3%
Typical Applications
Adjustable Negative Voltage Regulator
Comparison between SOT-223 and
D-Pak (TO-252) Packages
00906731
Scale 1:1
00906701
Full output current not available at high input-output voltages
C1 = 1 µF solid tantalum or 10 µF aluminum electrolytic required for
stability
*C2 = 1 µF solid tantalum is required only if regulator is more than 4" from
power-supply filter capacitor
Output capacitors in the range of 1 µF to 1000 µF of aluminum or tantalum
electrolytic are commonly used to provide improved output impedance and
rejection of transients
© 2004 National Semiconductor Corporation
DS009067
www.national.com