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