7805A
Test Circuits
3- Terminal Positive Voltage Regulators
V
IN
1
7805A
2
3
V
OUT
V
IN
C
IN
1
7805A
2
3
270pF
V
OUT
V
IN
- +
1
7805A
2
3
V
OUT
0.33uF
C
IN
C
OUT
0.33uF
R
L
0.1uF
100
V
OUT
0V
+
-
DC 9V
R
L
DC Parameter
Load Regulation
Ripple Rejection
Application Circuits
Constant Current Regulator
Circuit for Increasing Output Voltage
V
IN
1
7805A
2
3
V
OUT
V
IN
1
7805A
I
B
2
3
V
OUT
0.33uF
R
1
I
R1
0.1uF
10uF
0.33uF
R
1
R
2
0.1uF
10uF
V
OUT
=V
OUT(IC)
+V
Z
I
1
=V
OUT(IC)
/R
1
V
OUT
=V
OUT(IC)
(1+R
2
/R
1
)+R
2
*I
B
High Output Current with Short-circuit Protection
V
IN
R
1
Q
2
R
sc
Q
1
1
3
V
OUT
7805A
2
0.33uF
0.1uF
10uF
R
1
≤V
BE1
/I
B(max)
R
SC
=V
BE2
/I
SC
, I
SC
: Short-Circuit Current
3