Littelfuse MLA Automotive Varistor Series Bedienungsanleitung PDF herunterladen (Seite 3)

Revised: January 16, 2014

Varistor Products

MLA Automotive Varistor Series

Surface Mount Multilayer Varistors (MLVs) > MLA Automotive Series

Speciﬁcations are subject to change without notice.

Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information.

MLA Automotive Series

Peak Current and Energy Derating Curve

When transients occur in rapid succession, the average

power dissipation is the energy (watt-seconds) per pulse

times the number of pulses per second. The power so

developed must be within the speciﬁcations shown





temperature, the peak surge current and energy ratings

must be derated as shown below.

100

-55 50 60 70 80 90 100110 120130 140150

PERCENT OF RATED VALUE

AMBIENT TEMPERATURE (

FIGURE 1. PEAK CURRENT AND ENERGY

DERATING CURVE

100

TIME

PERCENT OF PEAK VALUE

= VIRTUAL ORIGIN OF WAVE

= VIRTUAL FRONT TIME = 1.25 x t

(IMPULSE DURATION)

t = TIME FROM 10% TO 90% OF PEAK

= VIRTUAL TIME TO HALF VALUE

EXAMPLE:

FOR AN 8/20 s CURRENT WAVEFORM

8s = t

= VIRTUAL FRONT TIME

20 s = t

= VIRTUAL TIME TO

HALF VALUE

FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM

FOR CLAMPING VOLTAGE

Peak Pulse Current Test Waveform for Clamping Voltage







= Decay Time

Example µ

µs = T



20µs = T

= Decay Time

Figure 1

Figure 2

1 2 3 4 5 6 7 8

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