LA4555

No.1697–3/10

Sample Printed Circuit Pattern (Cu-foiled side)

Description of External Parts

C1 (C2) : Feedback capacitor. The low cutoff frequency is determined by the following formula.

fL : Low cutoff frequency

Rf : Feedback resistance

Since this capacitor as well as decoupling capacitor affects the starting time, the capacitor value must be fixed

with the necessary low frequency band fully considered.

C3 (C4) : Bootstrap capacitor. The output at low frequencies depends on this capacitor. Decreasing the capacitor value

lowers the output at low frequencies. A capacitor value of 47

µF or more is required.

C5 (C6) : Oscillation blocking capacitor. Use a polyester film capacitor that is good in high frequency response and

temperature characteristic. The use of an electrolytic capacitor, ceramic capacitor may cause oscillation to

occur at low temperatures.

Continued on next page.

fL=

1

2

πC1Rf

Sample Application Circuit : Bridge Amplifier Use 1

Sample Application Circuit : Bridge Amplifier Use 2