LM2578A, LM3578A
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SNVS767E –AUGUST 2000–REVISED APRIL 2013
9V ≤ Vin ≤ 15V
Vo = 12V
R5 = 270
C1 = 1820 pF
C2 = 220 μF
C3 = 20 pF
Io = 100 mA
Vripple = 50 mV
fosc = 50 kHz
R1 = 110k
R2 = 10k
C4 = 0.0022 μF
L1 = 220 μH
D1, D2 = 1N5819
Q1 = D44
R3 = 0.15
R4 = 220k
Figure 35. Buck-Boost Regulator
Vin = 5V
R4 = 0.15Ω
C1 = 820 pF
C2 = 10 pF
C3 = 220 μF
Vo ±12V
Io = ±40 mA
fosc = 80 kHz
R1 = 10 kΩ
R2 = 240 kΩ
R3 = 240 kΩ
D1, D2, D3 = 1N5819
T1 = PE-64287
Figure 36. RS-232 Line Driver Power Supply
Capacitor C1 sets the oscillator frequency and is selected from Figure 14.
Capacitor C2 serves as a compensation capacitor for synchronous operation and a value of 10 to 50 pF should
be sufficient for most applications.
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