TL431 Datasheet, PDF (10/16 Pages) Motorola, Inc – PROGRAMMABLE PRECISION REFERENCES

TL431, A, B Series
Figure 30. High Efficiency Step–Down Switching Converter
Vin = 10 V to 20 V
TIP115
1.0 k
4.7 k
+
2200 µF
MPSA20
4.7 k
150 mH @ 2.0 A
4.7 k ^1N5823
0.01µF
100 k
+
470 µF
Vout = 5.0 V
Iout = 1.0 A
0.1 µF
2.2 k 10
51 k
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