TL431, A, B Series, NCV431A
150
mH
@ 2.0 A
V
in
= 10 V to 20 V
1.0 k
4.7 k
MPSA20
2200
mF
4.7 k
0.1
mF
2.2 k
10
51 k
4.7 k
1N5823
0.01mF
100 k
470
mF
+
TIP115
V
out
= 5.0 V
I
out
= 1.0 A
+
Figure 30. High Efficiency Step−Down Switching Converter
Test
Line Regulation
Load Regulation
Output Ripple
Output Ripple
Efficiency
Conditions
V
in
= 10 V to 20 V, I
o
= 1.0 A
V
in
= 15 V, I
o
= 0 A to 1.0 A
V
in
= 10 V, I
o
= 1.0 A
V
in
= 20 V, I
o
= 1.0 A
V
in
= 15 V, I
o
= 1.0 A
Results
53 mV (1.1%)
25 mV (0.5%)
50 mVpp P.A.R.D.
100 mVpp P.A.R.D.
82%
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