ACPL-P341-000E Avago Technologies US Inc., ACPL-P341-000E Datasheet - Page 18

• Manufacturer Part Number: ACPL-P341-000E
• Description: Gate Drive Optocoupler,LF
• Manufacturer: Avago Technologies US Inc.

Specifications of ACPL-P341-000E

• No. Of Channels: 1
• Optocoupler Output Type: Gate Drive
• Input Current: 16mA
• Opto Case Style: SOIC
• No. Of Pins: 6
• Leaded Process Compatible: Yes
• Peak Reflow Compatible (260 C): Yes
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Details

Dead Time and Propagation Delay Specifi cations
The ACPL-P341/W341 includes a Propagation Delay Dif-
ference (PDD) specifi cation intended to help designers
minimize “dead time” in their power inverter designs. Dead
time is the time period during which both the high and
low side power transistors (Q1 and Q2 in Figure 22) are off .
Any overlap in Q1 and Q2 conduction will result in large
currents fl owing through the power devices between the
high and low voltage motor rails.
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 conditions, transistor Q1 has
just turned off when transistor Q2 turns on, as shown in
Figure 27. The amount of delay necessary to achieve this
condition is equal to the maximum value of the propa-
gation delay diff erence specifi cation, PDD
specifi ed to be 100 ns over the operating temperature
range of 40° C to 105° C.
Figure 27. Minimum LED skew for zero dead time
18
MAX
, which is
Delaying the LED signal by the maximum propagation
delay diff erence 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 diff erence between the maximum and minimum
propagation delay diff erence specifi cations as shown in
Figure 28. The maximum dead time for the ACPL-P341/
W341 is 200 ns (= 100 ns - (-100 ns)) over an operating
temperature range of -40° C to 105° 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.
Figure 28. Waveforms for dead time