STK433-840N-E

No.A2108-7/12

Recommended external components

STK433-840N-E/890N-E

Parts

Location

Recommended

value

Circuit purpose

Above

Recommended value

Below

Recommended value

R01, R02

100

/1W

Resistance for Ripple filters. (Fuse resistance is recommended.

Ripple filter is constituted with C03, C04.)

Short-through current

may decrease at

high frequency.

Short-through current

may increase at high

frequency.

R03,R04,R05,

R06

1k



Resistance for input filters.

-

-

R07,R08,R09,

R10

56k



Input impedance is determined.

Output neutral voltage (VN) shift.

(It is referred that R07=R11, R08=R12,

R09=R13, R10=R14)

R11,R12,R13,

R14

56k



Voltage Gain (VG) is determined with R15, R16, R17, R18

-

-

R15,R16,R17,

R18

1.8k



Voltage Gain (VG) is determined with R11, R12, R13, and R14.

(As for VG, it is desirable to set up by R15, R16, R17, and R18.)

It may oscillate.

(Vg < 30dB)

With especially no

problem

R19,R20,R21,

R22

4.7



Resistance for oscillation prevention.

-

-

R23,R24,R25,

R26

4.7

/1W

Resistance for oscillation prevention.

-

-

R27,R28,R29,

R30

0.22



10%, 5W

Output emitter resistor (Metal-plate Resistor is recommended.)

Decrease of

Maximum output

Power

It may cause thermal

runaway

R31

Note *4

Select Restriction resistance, for the impression voltage of ‘#13 (Stand-By) pin’ must not exceed the maximum

rating.

C01, C02

100

F/100V

Capacitor for oscillation prevention.

 Locate near the HIC as much as possible.

 Power supply impedance is lowered and stable operation of

the IC is carried out. (Electrolytic capacitor is recommended.)

-

-

C03,C04

100

F/100V

Decoupling capacitor

 The Ripple ingredient mixed in an input side Is removed from a

power supply line. (Ripple filter is constituted with R01, R02.)

The change in the Ripple ingredient mixed in

an input side from a power supply line

C05,C06,C07,

C08

2.2

F/50V

Input coupling capacitor. (For DC current prevention.)

-

C09,C10,C11,

C12

470pF

Input filter capacitor

 A high frequency noise is reduced with the filter constituted by

R03, R04, R05, R06.

-

C13,C14,C15,

C16

5pF

Capacitor for oscillation prevention.

It may oscillate.

C17,C18,C19,

C20

10

F/10V

Negative feedback capacitor.

The cutoff frequency of a low cycle changes.

(fL = 1/(2

  C17  R15))

The voltage gain (VG)

of low frequency is

extended. However,

the pop noise at the

time of a power

supply injection also

becomes large.

The voltage gain (VG)

of low frequency

decreases.

C21,C22,C23,

C24

0.1

F

Capacitor for oscillation prevention.

It may oscillate.

C25,C26,C27,

C28

100pF

Capacitor for oscillation prevention.

It may oscillate.

L01,L02,L03,

L04

3

H

Coil for oscillation prevention.

With especially

no problem

It may oscillate.