TL431, A, B Series
Figure 30. High Efficiency Step–Down Switching Converter
150 H @ 2.0 A
V
= 10 V to 20 V
in
TIP115
V
= 5.0 V
= 1.0 A
out
I
out
1.0 k
1N5823
4.7 k
4.7 k
100 k
470
MPSA20
4.7 k
0.01µF
+
2200 µF
+
µF
0.1 µF
2.2 k
10
51 k
Test
Conditions
= 10 V to 20 V, I = 1.0 A
Results
Line Regulation
Load Regulation
Output Ripple
Output Ripple
Efficiency
V
in
V
in
V
in
V
in
V
in
53 mV (1.1%)
25 mV (0.5%)
o
= 15 V, I = 0 A to 1.0 A
o
= 10 V, I = 1.0 A
50 mVpp P.A.R.D.
o
= 20 V, I = 1.0 A
100 mVpp P.A.R.D.
82%
o
= 15 V, I = 1.0 A
o
10
MOTOROLA ANALOG IC DEVICE DATA