STK433-730-E

No. A1249-6/12

Recommended Values for Application Parts (for the test circuit)

Symbol

Recommen

ded Value

Description

Larger than

Recommended Value

Smaller than

Recommended Value

R01

47

Ω

Ripple filtering resistors (Fusible resistors are desirable)

(Used with C03 to form a ripple filter.)

Decreased pass-

through current at high

frequencies.

Increased pass-

through current at high

frequencies.

R03

-

Use a limiting resistor according to the stand-by control voltage in order to control the stand-by pin voltage VST within the

rating.

R11, 12

4.7

Ω

Noise-absorbing resistors

-

-

R13, 14

4.7

Ω/1W

Oscillation prevention

-

-

R15, 16

56k

Ω

Used with R23 and R24 to determine the voltage gain VG.

VN offset

(Ensure R15=R25, R16=R26 when changing.)

R21, 22

1k

Ω

Input filtering resistor

-

-

R23, 24

1.8k

Ω

Used with R15 and R16 to determine the voltage gain VG. (VG

should desirably be determined by the R23 and R24 value.)

Likely to oscillate

(VG<30dB)

None

(VG

≤42dB)

R25, 26

56k

Ω

Input bias resistors (Virtually determine the input impedance.)

-

-

R27, 28

3k

Ω

Oscillation prevention

Likely to oscillate

C01, 02

100

μF

Oscillation prevention

• Insert the capacitors as close to the IC as possible to decrease

the power impedance for reliable IC operation (use of

electrolytic capacitors are desirable).

-

-

C03

200

μF

Decoupling capacitors.

• Eliminate ripple components that pass into the input side from

the power line. (Used with R01 to form a filter.)

Increase in ripple components that pass into the

input side from the power line.

C05

0.01

μF

A detection voltage appears during the protection operation. Adjust the time constant (when the detection pin is to be

used).

C11, 12

0.1

μF

Oscillation prevention (Mylar capacitors are recommended.)

Likely to oscillate

C13, 14

12pF

Oscillation prevention

Likely to oscillate

C21, 22

470pF

Input filter capacitor

(Used with R21 and R22 to form a filter that suppresses high-

frequency noises.)

-

-

C23, 24

2.2

μF

Input coupling capacitor (block DC current)

-

-

C25, 26

10

μF

NF capacitor

(Changes the low cutoff frequency; fL=1/ (2π • C25 • R23)

Increase in low-

frequency voltage gain,

with higher pop noise

at power-on.

Decrease in low-

frequency voltage gain

C27, 28

2200pF

Oscillation prevention

Likely to oscillate

L11, 12

1

μH

Oscillation prevention

None

Likely to oscillate