AC16FGM Teccor Electronics, AC16FGM Datasheet - Page 186

• Manufacturer Part Number: AC16FGM
• Manufacturer: Teccor Electronics

AN1009
Examples of Gate Terminations
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Primary Purpose
(1) Increase dv/dt capability
(2) Keep gate clamped to ensure V
capability
(3) Lower t
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 t
Primary Purpose
(1) Decrease DC gate sensitivity
(2) Decrease t
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 t
Related Effects — Isolates the gate if high
impedance signal source is used without
sustained diode current in the negative cycle
q
q
time
time
q
q
time
time
DRM
AN1009 - 2
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:
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 (T
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 T
then derated down to the maximum junction (T
illustrated in Figure AN1009.4 are derated to 125 °C since the
maximum T
Figure AN1009.4
optional
Zener
30° = 0.40 x Avg 180°
60° = 0.56 x Avg 180°
90° = 0.70 x Avg 180°
120° = 0.84 x Avg 180°
J
for the non-sensitive SCR series is 125 °C.
125
120
115
110
105
100
95
90
85
80
0
Typical Curves for Average On-state Current at
Various Conduction Angles versus T
SXX20L SCR
Average On-state Current [I
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, I
reverse gate signals which may inhibit con-
duction
2
4
5.1
6
7.2
8
Current: Halfwave Sinusoidal
Load: Resistive or Inductive
Conduction Angle: As Given Below
Case Temperature: Measured as
Shown on Dimensional Drawings
10
10.8
Conduction Angle
T
©2002 Teccor Electronics
(AV)] – Amps
Thyristor Product Catalog
12
12.8
J
). The curves
14
Application Notes
gt
C
C
) remains the
followed by
16
for a
C
curve is