LM2578A, LM3578A

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SNVS767E – AUGUST 2000 – REVISED APRIL 2013

9V

R5 = 270

C1 = 1820 pF

C2 = 220

μF

C3 = 20 pF

C4 = 0.0022

μF

R1 = 110k

L1 = 220

μH

R2 = 10k

D1, D2 = 1N5819

R3 = 0.15

Q1 = D44

R4 = 220k

Figure 35. Buck-Boost Regulator

R4 = 0.15

Ω

C1 = 820 pF

C2 = 10 pF

C3 = 220

μF

R1 = 10 k

Ω

D1, D2, D3 = 1N5819

R2 = 240 k

Ω

T1 = PE-64287

R3 = 240 k

Ω

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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