LA42352

No.A0078-5/9

Continued from preceding page.

Pin Voltage

Pin No

Symbol

VCC = 18V

Equivalent Circuit

Description

8

12

OUT2

OUT1

8.9

• Output pin

9

10

NF2

NF1

8.8

• Negative feedback pin at Power

amplifier

• Connect NF capacitor

10

PWR_GND

0

• Power GND pin

Description of External parts

C1, C2

: Input capacitors. A value of 1.0

µF is recommended for capacitors. Note that the low-frequency area

characteristics can be adjusted by changing fL.

C3

: Ripple filter capacitor. A value of 47

µF is recommended for capacitors. Decreasing the capacitance value

excessively or removing this capacitor causes ripple to occur. However, increasing the capacitance value

does not always cause ripple to reduced. Decreasing the capacitance value makes the starting time earlier.

C4

: Power capacitor.

C5, C6

: Output capacitors. A value of 470

µF is recommended for capacitors.

C7, C8

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

temperature characteristic.

C9, C10

: Feedback capacitor. A value of 47

µF is recommended for capacitors. Decreasing the capacitance value

lowers the low frequency response. Increasing the capacitance value makes the starting time later.

R1, R2

: Resistor connected in series with oscillation blocking capacitor. Prevents phase shift attributable to the

oscillation blocking capacitor so that oscillation is hard to occur.

R3

: Standby switch current limiting resistor. A value of 10k

Ω is recommended for resistance (when the applied

voltage for the standby switch is 3V to 10V). This resistor cannot be removed.