BL03RN2-R62 Просмотр технического описания (PDF) - Murata Manufacturing

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BL03RN2-R62

EMI LEADED FILTERS

Murata Manufacturing 

EMI LEADED FILTERS

EMI SUPPRESSION FILTERS

VARISTOR-CAPACITORS

3 -TERMINAL STRUCTURE

Appearance

12-22

223S

M

Symbol

Ferrite bead:

Absorbs high-frequency noise.

DSS710 Series

NOISE ABSORPTION EFFECT OF

VARISTOR-CAPACITOR

SCALE:

200V/Div.

10NS/Div.

Varistor:

Bypasses high-voltage

surges to ground in order

to protect circuits.

Capacitor:

Bypasses high-frequency noise.

The reason the 3-terminal structure provides excellent

high frequency characteristics.

Bypass capacitors should logically be able to remove

more noise as frequency increases. In actual fact, the

electrodes and lead wires of the capacitor have series

inductance as shown in Fig. 3, and this causes an LC

resonance when the frequency is between 1MHz and

50MHz. As a result, when the frequency is higher than

the self-resonance frequency, the noise suppression

capability of the bypass capacitor is drastically reduced

because the capacitor functions as inductor. To solve

this problem, the DSS series has one side of the capacitor

electrodes connected to two lead wires. This eliminates

the series inductance to the capacitor. Furthermore,

a ferrite bead is attached to each lead wire to form a

T-shaped filter, thus providing efficient noise suppression.

Varistor-Capacitor

is used to suppress

the surge

shown below

Waveform when a

Varistor-Capacitor is

not used (surge from

a noise simulator).

12-22

223S

M

Waveform after the

noise passes through

a Varistor-Capacitor.

Protection of circuitry

is achieved.

Conventional 2-Lead Capacitor

3-Lead Capacitor (DSS Series)

The Varistor-Capacitor is capable of removing even

1200V surges and will withstand 2000V impulses.

Fig. 3 Equivalent circuit

APPLICATIONS

Systems

Engine Controllers

Automobile

Audio Equipment

Computers

DC Motors

Lines to be connected to

Power lines, I/O for

low-frequency current

Power lines, audio

output lines

Power lines, I/O lines for

low-frequency current

Power lines

Effects

Protection of systems from excessive voltage. Prevents ignition noise,

lightning surges, etc. from causing malfunctions.

Protection of system from excessive voltage. Prevents ignition noise from

influencing audio current.

Protection of systems from excessive voltage. Prevents radiation and

conduction noise.

Prevention of brush noise.

258

CG01-I

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