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LM337D2TR4G Datenblatt(PDF) 7 Page - ON Semiconductor

Teilenummer LM337D2TR4G
Bauteilbeschribung  1.5 A, Adjustable Output, Negative Voltage Regulator
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Hersteller  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM337D2TR4G Datenblatt(HTML) 7 Page - ON Semiconductor

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LM337
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7
APPLICATIONS INFORMATION
Basic Circuit Operation
The LM337 is a 3−terminal floating regulator. In
operation, the LM337 develops and maintains a nominal
−1.25 V reference (Vref) between its output and adjustment
terminals. This reference voltage is converted to a
programming current (IPROG) by R1 (see Figure 17), and this
constant current flows through R2 from ground.
The regulated output voltage is given by:
Vout + Vref 1 )
R
2
R
1
) I
Adj
R
2
Since the current into the adjustment terminal (IAdj)
represents an error term in the equation, the LM337 was
designed to control IAdj to less than 100 mA and keep it
constant. To do this, all quiescent operating current is
returned to the output terminal. This imposes the
requirement for a minimum load current. If the load current
is less than this minimum, the output voltage will rise.
Since the LM337 is a floating regulator, it is only the
voltage differential across the circuit which is important to
performance, and operation at high voltages with respect to
ground is possible.
Figure 17. Basic Circuit Configuration
+
-
Vout
CO
R2
IPROG
R1
Adjust
Vin
LM337
Vout
+
Vref = -1.25 V Typical
Vref
Vout
IAdj
Load Regulation
The LM337 is capable of providing extremely good load
regulation, but a few precautions are needed to obtain
maximum performance. For best performance, the
programming resistor (R1) should be connected as close to
the regulator as possible to minimize line drops which
effectively appear in series with the reference, thereby
degrading regulation. The ground end of R2 can be returned
near the load ground to provide remote ground sensing and
improve load regulation.
External Capacitors
A 1.0
mF tantalum input bypass capacitor (Cin) is
recommended to reduce the sensitivity to input line
impedance.
The adjustment terminal may be bypassed to ground to
improve ripple rejection. This capacitor (CAdj) prevents
ripple from being amplified as the output voltage is
increased. A 10
mF capacitor should improve ripple
rejection about 15 dB at 120 Hz in a 10 V application.
An output capacitance (CO) in the form of a 1.0 mF
tantalum or 10
mF aluminum electrolytic capacitor is
required for stability.
Protection Diodes
When external capacitors are used with any IC regulator
it is sometimes necessary to add protection diodes to prevent
the capacitors from discharging through low current points
into the regulator.
Figure 18 shows the LM337 with the recommended
protection diodes for output voltages in excess of −25 V or
high capacitance values (CO > 25 mF, CAdj > 10 mF). Diode
D1 prevents CO from discharging thru the IC during an input
short circuit. Diode D2 protects against capacitor CAdj
discharging through the IC during an output short circuit.
The combination of diodes D1 and D2 prevents CAdj from
the discharging through the IC during an input short circuit.
Figure 18. Voltage Regulator with Protection Diodes
+
-
+
Cin
-Vin
R2
CAdj
+
+
1N4002
LM337
Vout
Vout
Vin
D1
1N4002
R1
D2
CO
Adjust
Vout
Figure 19. D2PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
30
40
50
60
70
80
Minimum
Size Pad
2.0 oz. Copper
L
L
Free Air
Mounted
Vertically
RqJA
1.0
1.5
2.0
2.5
3.0
3.5
010
20
30
25
15
5.0
L, LENGTH OF COPPER (mm)
PD(max) for TA = +50°C


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