KA78XXE_12 Datasheet, PDF (21/26 Pages) Fairchild Semiconductor – 3-Terminal 1A Positive Voltage Regulator

Input
C_I
1
0.33µF
KA7805E
2
3
6
-2
KA741
+3
4
Output
10KΩ
C_O
0.1µF
I_RI ≥ 5 I_Q
V_O = V_XX(1 + R₂ / R₁) + I_QR₂
Figure 13. Adjustable Output Regulator (7 to 30V)
Input
V_I
R1
3Ω
R1 = ^VBEQ1
I_REG–I_Q1/ B_Q1
1
IREG
0.33µF
IQ1
3
KA78XXE
2
Output
I_O
Vo
0.1µF
I_O = I_REG + B_Q1 (I_REG–V_BEQ1/R₁)
Figure 14. High Current Voltage Regulator
Input
Q1
V_I
Q2
R1
3Ω
Q1 = TIP42
Q2 = TIP42
RSC = ^VBEQ2
I _SC
1 _KA78XXE 3
0.33µF
2
0.1µF
Figure 15. High Output Current with Short Circuit Protection
Vo
Output
21
KA78XXE/KA78XXAE Rev. 1.0.5
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