LM317L
Figure 2. Load Regulation and
∆I
Adj
/Load
Test Circuit
Load Regulation (mV) = VO (min Load) –VO (max Load)
Load Regulation (% VO) =
Vin*
Vin
Vout
VO (min Load) – VO (max Load)
VO (min Load)
X
100
VO (min Load)
VO (max Load)
LM317L
IL
RL
(max Load)
*
+
CO
1.0µF
Adjust
Cin
0.1µF
IAdj
R1
240
1%
RL
(min Load)
R2
1%
* Pulse Testing Required:
1% Duty Cycle is suggested.
Figure 3. Standard Test Circuit
Vin
Vout
LM317L
IL
Adjust
R1
IAdj
VI
Cin
0.1µF
ISET
R2
1%
240
1%
Vref
+
CO
1µF
RL
VO
Pulse Testing Required:
1% Duty Cycle is suggested.
To Calculate R2:
Vout = ISET R2 + 1.250 V
Assume ISET = 5.25 mA
Figure 4. Ripple Rejection Test Circuit
14.30V
4.30V
f = 120 Hz
Vin
LM317L
Vout
Vout = 1.25 V
Adjust
Cin
0.1µF
R1
240
1%
D1 *
1N4002
+
CO
1µF
RL
VO
R2
1.65K
1%
+
**
10µF
* D1 Discharges CAdj if Output is Shorted to Ground.
**CAdj provides an AC ground to the adjust pin.
4
MOTOROLA ANALOG IC DEVICE DATA
ONSEMI [ ON SEMICONDUCTOR ]
