HCPL-J312 Datasheet, PDF (24/24 Pages) AVAGO TECHNOLOGIES LIMITED – 2.5 Amp Output Current IGBT Gate Drive Optocoupler

To minimize dead time in a given design, the turn on of
LED2 should be delayed (relative to the turn off of LED1)
so that under worst-case con-ditions, transistor Q1 has
just turned off when transistor Q2 turns on, as shown in
Figure 35. The amount of delay necessary to achieve this
condi­tions is equal to the maximum value of the propa-
gation delay difference specification, PDD_MAX, which is
specified to be 350 ns over the operating temperature
range of ‑40°C to 100°C.
Delaying the LED signal by the maximum propagation
delay difference ensures that the minimum dead time is
zero, but it does not tell a designer what the maximum
dead time will be. The maximum dead time is equivalent
to the difference between the maximum and minimum
propa­ga­tion delay difference specifica­tions as shown in
Figure 36. The maximum dead time for the HCPL-3120 is
700 ns (= 350 ns - (-350 ns)) over an operating tempera-
ture range of -40°C to 100°C.
Note that the propagation delays used to calculate PDD
and dead time are taken at equal tempera­tures and test
conditions since the optocouplers under consider­ation
are typically mounted in close proximity to each other
and are switching identical IGBTs.
HCPL-3120 OPTION 060éHCPL-J312
800
P_S (mW)
700
I_S (mA) FOR HCPL-3120
OPTION 060
600
I_S (mA) FOR HCPL-J312
500
400
300
200
100
0
0 25 50 75 100 125 150 175 200
T_S – CASE TEMPERATURE – °C
1000
900
800
HCNW3120
P_S (mW)
I_S (mA)
700
600
500
400
300
200
100
0
0 25 50 75 100 125 150 175
T_S – CASE TEMPERATURE – °C
Figure 37. Thermal derating curve, dependence of safety limiting value with case temperature per IEC/EN/DIN EN 60747-5-2.
HCPL-3120 fig 37a
HCPL-3120 fig 37b
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Data subject to change. Copyright © 2005-2008 Avago Technologies. All rights reserved. Obsoletes AV01-0622EN
AV02-0161EN - July 4, 2008