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LM137H PDF даташит

Спецификация LM137H изготовлена ​​​​«National Semiconductor» и имеет функцию, называемую «3-Terminal Adjustable Negative Regulators».

Детали детали

Номер произв LM137H
Описание 3-Terminal Adjustable Negative Regulators
Производители National Semiconductor
логотип National Semiconductor логотип 

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LM137H Даташит, Описание, Даташиты
May 1999
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 re-
sistors 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.
Features
n Output voltage adjustable from −1.2V to −37V
n 1.5A output current guaranteed, −55˚C to +150˚C
n Line regulation typically 0.01%/V
n Load regulation typically 0.3%
n Excellent thermal regulation, 0.002%/W
n 77 dB ripple rejection
n Excellent rejection of thermal transients
n 50 ppm/˚C temperature coefficient
n Temperature-independent current limit
n Internal thermal overload protection
n P+ Product Enhancement tested
n Standard 3-lead transistor package
n Output is short circuit protected
LM137 Series Packages and Power
Capability
Device
Package
LM137/337
LM337
LM337
TO-3 (K)
TO-39 (H)
TO-220 (T)
SOT-223
(MP)
Rated
Power
Dissipation
20W
2W
15W
2W
Design
Load
Current
1.5A
0.5A
1.5A
1A
Typical Applications
Adjustable Negative Voltage Regulator
Comparison between SOT-223 and
D-Pak (TO-252) Packages
Full output current not available at high input-output voltages
DS009067-1
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
Scale 1:1
DS009067-31
© 1999 National Semiconductor Corporation DS009067
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LM137H Даташит, Описание, Даташиты
Absolute Maximum Ratings (Notes 1, 4)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation
Input-Output Voltage Differential
Operating Junction Temperature Range
LM137
Internally Limited
40V
−55˚C to +150˚C
LM337
Storage Temperature
Lead Temperature (Soldering, 10 sec.)
Plastic Package (Soldering, 4 sec.)
ESD Rating
0˚C to +125˚C
−65˚C to +150˚C
300˚C
260˚C
2k Volts
Electrical Characteristics
(Note 1)
Parameter
Line Regulation
Load Regulation
Thermal Regulation
Adjustment Pin Current
Conditions
Tj = 25˚C, 3V |VIN − VOUT| 40V
(Note 2) IL = 10 mA
Tj = 25˚C, 10 mA IOUT IMAX
Tj = 25˚C, 10 ms Pulse
LM137
Min Typ Max
0.01 0.02
0.3
0.002
65
0.5
0.02
100
LM337
Units
Min Typ Max
0.01 0.04 %/V
0.3 1.0
%
0.003 0.04 %/W
65 100 µA
Adjustment Pin Current Charge
Reference Voltage
Line Regulation
Load Regulation
Temperature Stability
Minimum Load Current
Current Limit
10 mA IL IMAX
3.0V |VIN − VOUT| 40V,
TA = 25˚C
Tj = 25˚C (Note 3)
3V |VIN − VOUT| 40V, (Note 3)
10 mA IOUT IMAX, P PMAX
3V |VIN − VOUT| 40V, (Note 2)
10 mA IOUT IMAX, (Note 2)
TMIN Tj TMAX
|VIN − VOUT| 40V
|VIN − VOUT| 10V
|VIN − VOUT| 15V
K, MP and T Package
25
25
−1.225 −1.250 −1.275 −1.213 −1.250 −1.287
−1.200 −1.250 −1.300 −1.200 −1.250 −1.300
0.02 0.05
0.3 1
0.6
2.5 5
1.2 3
0.02 0.07
0.3 1.5
0.6
2.5 10
1.5 6
1.5 2.2 3.5 1.5 2.2 3.7
µA
V
V
%/V
%
%
mA
mA
A
H Package
|VIN − VOUT| = 40V, Tj = 25˚C
K, MP and T Package
0.5 0.8 1.8 0.5 0.8 1.9
0.24 0.4
0.15 0.4
A
A
RMS Output Noise, % of VOUT
Ripple Rejection Ratio
Long-Term Stability
Thermal Resistance, Junction to
Case
H Package
Tj = 25˚C, 10 Hz f 10 kHz
VOUT = −10V, f = 120 Hz
CADJ = 10 µF
Tj = 125˚C, 1000 Hours
H Package
K Package
0.15 0.17
0.003
60
66 77
0.3
12
2.3
1
15
3
0.10 0.17
A
0.003
%
60 dB
66 77
dB
0.3 1
%
12 15 ˚C/W
2.3 3 ˚C/W
T Package
4 ˚C/W
Thermal Resistance, Junction to H Package
Ambient (No Heat Sink)
K Package
140 140 ˚C/W
35 35 ˚C/W
T Package
MP Package
50 ˚C/W
170 ˚C/W
Note 1: Unless otherwise specified, these specifications apply −55˚C Tj +150˚C for the LM137, 0˚C Tj +125˚C for the LM337; VIN − VOUT = 5V; and IOUT
= 0.1A for the TO-39 package and IOUT = 0.5A for the TO-3, SOT-223 and TO-220 packages. Although power dissipation is internally limited, these specifications
are applicable for power dissipations of 2W for the TO-39 and SOT-223 (see Application Hints), and 20W for the TO-3, and TO-220. IMAX is 1.5A for the TO-3,
SOT-223 and TO-220 packages, and 0.2A for the TO-39 package.
Note 2: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are cov-
ered under the specification for thermal regulation. Load regulation is measured on the output pin at a point 18" below the base of the TO-3 and TO-39 packages.
Note 3: Selected devices with tightened tolerance reference voltage available.
Note 4: Refer to RETS137H drawing for LM137H or RETS137K drawing for LM137K military specifications.
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LM137H Даташит, Описание, Даташиты
Schematic Diagram
Thermal Regulation
When power is dissipated in an IC, a temperature gradient
occurs across the IC chip affecting the individual IC circuit
components. With an IC regulator, this gradient can be espe-
cially severe since power dissipation is large. Thermal regu-
lation is the effect of these temperature gradients on output
voltage (in percentage output change) per Watt of power
change in a specified time. Thermal regulation error is inde-
pendent of electrical regulation or temperature coefficient,
and occurs within 5 ms to 50 ms after a change in power dis-
sipation. Thermal regulation depends on IC layout as well as
electrical design. The thermal regulation of a voltage regula-
tor is defined as the percentage change of VOUT, per Watt,
within the first 10 ms after a step of power is applied. The
LM137’s specification is 0.02%/W, max.
DS009067-2
LM137, VOUT = −10V
VIN − VOUT = −40V
IIL = 0A 0.25A 0A
Vertical sensitivity, 5 mV/div
FIGURE 1.
DS009067-3
In Figure 1, a typical LM137’s output drifts only 3 mV (or
0.03% of VOUT = −10V) when a 10W pulse is applied for
10 ms. This performance is thus well inside the specification
limit of 0.02%/W x 10W = 0.2% max. When the 10W pulse is
ended, the thermal regulation again shows a 3 mV step at
the LM137 chip cools off. Note that the load regulation error
of about 8 mV (0.08%) is additional to the thermal regulation
error. In Figure 2, when the 10W pulse is applied for 100 ms,
the output drifts only slightly beyond the drift in the first
10 ms, and the thermal error stays well within 0.1% (10 mV).
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