AC08FSM datasheet(186/223 Pages) TECCOR

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AN1009

Application Notes

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AN1009 - 2

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Examples of Gate Terminations

Primary Purpose

(1) Increase dv/dt capability

(2) Keep gate clamped to ensure VDRM

capability

(3) Lower tq time

Related Effect — Raises the device latching

and holding current

Primary Purpose

(1) Increase dv/dt capability

(2) Remove high frequency noise

Related Effects

(1) Increases delay time

(2) Increases turn-on interval

(3) Lowers gate signal rise time

(4) Lowers di/dt capability

(5) Increases tq time

Primary Purpose

(1) Decrease DC gate sensitivity

(2) Decrease tq time

Related Effects

(1) Negative gate current increases holding

current and causes gate area to drop out of

conduction

(2) In pulse gating gate signal tail may

cause device to drop out of conduction

Primary Purpose — Select frequency

Related Effects — Unless circuit is

“damped,” positive and negative gate current

may inhibit conduction or bring about spo-

radic anode current

Primary Purpose

(1) Supply reverse bias in off period

(2) Protect gate and gate supply for reverse

transients

(3) Lower tq time

Related Effects — Isolates the gate if high

impedance signal source is used without

sustained diode current in the negative cycle

Primary Purpose — Decrease threshold

sensitivity

Related Effects

(1) Affects gate signal rise time and di/dt

rating

(2) Isolates the gate

Primary Purpose — Isolate gate circuit DC

component

Related Effects — In narrow gate pulses

and low impedance sources, Igt followed by

reverse gate signals which may inhibit con-

duction

Curves for Average Current at Various

Conduction Angles

SCR maximum average current curves for various conduction

angles can be established using the factors for maximum aver-

age current at conduction angle of:

30° = 0.40 x Avg 180°

60° = 0.56 x Avg 180°

90° = 0.70 x Avg 180°

120° = 0.84 x Avg 180°

The reason for different ratings is that the average current for

conduction angles less than 180° is derated because of the

higher RMS current connected with high peak currents.

Note that maximum allowable case temperature (TC) remains the

same for each conduction angle curve but is established from

average current rating at 180° conduction as given in the data

sheet for any particular device type. The maximum TC curve is

then derated down to the maximum junction (TJ). The curves

illustrated in Figure AN1009.4 are derated to 125 °C since the

maximum TJ for the non-sensitive SCR series is 125 °C.

Figure AN1009.4

Typical Curves for Average On-state Current at

Various Conduction Angles versus TC for a

SXX20L SCR

Zener

optional

100

105

110

115

120

125

02468

Average On-state Current [IT(AV)] – Amps

Current: Halfwave Sinusoidal

Load: Resistive or Inductive

Conduction Angle: As Given Below

Case Temperature: Measured as

Shown on Dimensional Drawings

Conduction Angle

7.2

10.8

12.8

5.1

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