STK4042V

No. 4390-4/5

Description of External Parts

: Input filter circuit

• Reduces high-frequency noise.

: Input coupling capacitor

• DC current suppression. A reduction in reactance is effective because of increases in capacitor

reactance at low frequencies and 1/f noise dependence on signal source resistance which result in

output noise worsening.

: Input bias resistor

• Biases the input pin to zero.

• Due to differential input, input resistance is more or less determined by this resistance value.

: NFB circuit (AC NF circuit). Use of resistor with 1% error is suggested.

log20·

40 dB is recommended.

equation:

1

[Hz]

2

π·R

: Differential constant-current bias resistor

: For oscillation suppression and phase compensation applications

(For use with differential stage applications)

: For oscillation suppression and phase compensation applications

: For oscillation suppression and phase compensation applications

Power stage (Must be connected near the pin)

: For oscillation suppression and phase compensation applications

(Oscillation suppression before power step clip)

: For oscillation suppression and distortion improvement applications

: Ripple filter circuit on positive (+) side.

: Ripple filter circuit on negative (–) side.

• Used for reducing power supply impedance to stable IC operation and should be connected near the IC

pin. We recommend that you use an electrolytic capacitor.

: Output resistor

Increases load shorting endurance capacity during times of high output.

: For oscillation suppression applications

Increases oscillation stability against capacitance loads.