TL431, A, B Series
Figure 30. High Efficiency Step–Down Switching Converter
150
m
H @ 2.0 A
TIP115
1.0 k
4.7 k
MPSA20
2200
µF
4.7 k
0.1
µF
2.2 k
10
51 k
4.7 k
1N5823
0.01µF
100 k
470
µF
+
Vout = 5.0 V
Iout = 1.0 A
Vin = 10 V to 20 V
+
Test
Line Regulation
Load Regulation
Output Ripple
Output Ripple
Efficiency
Conditions
Vin = 10 V to 20 V, Io = 1.0 A
Vin = 15 V, Io = 0 A to 1.0 A
Vin = 10 V, Io = 1.0 A
Vin = 20 V, Io = 1.0 A
Vin = 15 V, Io = 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%
10
MOTOROLA ANALOG IC DEVICE DATA