KA78MXX_02 Datasheet, PDF (9/14 Pages) Fairchild Semiconductor – 3-Terminal 0.5A Positive Voltage Regulator

Typical Applications
1
3
VI
KA78MXX
VO
CI
0.3µF
2
CO _0.1µF
Figure 1. Fixed Output Regulator
1
3
VI
KA78MXX
CI
2
0.33µF
IO
CO
0.1µF
Vxx
IO = _R1 +IO
VXX
IO
R1
Figure 2. Constant Current Regulator
Notes:
1. To specify an output voltage, substitute voltage value for "XX"
2. Although no output capacitor is needed for stability, it does improve transient response.
3. Required if regulator is located an appreciable distance from power Supply filter
1
3
VI
KA78MXX
VO
CI
2
0.33µF
IO
CO
VXX
R1
0.1µF
IR1 ≥ 5IO
R2
VO = VXX (1+R2/R1) +IOR2
Figure 3. Circuit for Increasing Output Voltage
KA78MXX
9