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LM337 Datasheet(PDF) 4 Page - ON Semiconductor

Part # LM337
Description  1.5 A, Adjustable Output Negative Voltage Regulator
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM337 Datasheet(HTML) 4 Page - ON Semiconductor

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LM337
www.onsemi.com
4
Figure 2. Load Regulation and
DIAdj/Load Test Circuit
Figure 3. Standard Test Circuit
Figure 4. Ripple Rejection Test Circuit
VO (min Load) - VO (max Load)
Cin
1.0
mF
R2
1%
R1
120
CO +
RL
(max
Load)
Adjust
Vin
-VI
LM337
Vout
*Pulse testing required.
1% Duty Cycle is suggested.
Load Regulation (mV) = VO (min Load) - VO (max Load)
Load Regulation (% VO) =
x 100
IL
IAdj
1.0
mF
-VO (min Load)
-VO (max Load)
VO
RL
+
1.0
mF
CO
R1
120
1%
R2
Cin
Adjust
Vin
LM337
To Calculate R2:
R2 =
- 1
R1
This assumes IAdj is negligible.
* Pulse testing required.
* 1% Duty Cycle is suggested.
VI
IAdj
Vref
IL
VO
1.0
mF
Vout
RL
+
1.0
mF
CO
1N4002
D1*
Cin
1%
R2
Adjust
Vin
LM337
R1
120
14.3 V
4.3 V
f = 120 Hz
CAdj
+
Vout = -1.25 V
* D1 Discharges CAdj if output is shorted to Ground.
1.0
mF
10
mF
Vout
VO
*
VO (min Load)
Vref


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