MC78MXX_09 Datasheet, PDF (9/14 Pages) Fairchild Semiconductor – 3-Terminal 0.5A Positive Voltage Regulator

Typical Applications
VI
1 _MC78MXX
3
LM78MXX
VO
CI
0.3μF
2
CO _0.1μF
MC78MXX/LM78MXX
Figure 1. Fixed Output Regulator
VI
1 _MC78MXX
3
LM78MXX
CI
2
0.33μF
IO
CO
0.1μF
VXX
IO
Vxx
R1
IO = _R1 +IO
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. CI is required if regulator is located an appreciable distance from power Supply filter
VI
1 _MC78MXX
3
LM78MXX
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
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