ACPL-H342 View Datasheet(PDF) - Avago Technologies
Part Name
Description
MFG CO.
'ACPL-H342' PDF : 19 Pages View PDF
The ACPL-H342 with the Anti-Cross feature has a PDDMIN
of -10ns and a PDDMAX of -200ns. Since the PDD is always
a negative value, the tPHLMAX is always faster than tPLHMIN.
Thus this simplified the design without having to add any
amount of delay for the input LEDs as shown in Figure 39.
Symbol
tPLH
tPHL
PDD (tPHL - tPLH)
Min. Typ. Max. Units
0.100 0.260 0.350 µs
0.050 0.145 0.250 µs
-0.010 -0.100 -0.200 µs
ILED1
Dead time is the time period during which both the
high(Q1) and low(Q2) side transistor are off. During this
time, no work is done and this reduces the efficiency of
the inverter or motor drive. The minimum and maximum
dead time is shown in Figure 39 and 40 and is equivalent
to the PDDMIN and PDDMAX . Due to the smaller PDD and
skewed propagation delay configuration, ACPL-H342
shows a smaller maximum dead time as compared to its
predecessor, HCPL-3120 as shown in figure 41 and hence
an improve in efficiency. Note that the propagation delays
used to calculate PDD and dead time are taken at equal
temperature and test conditions since the optocou-
plers under consideration are typically mounted in close
proximity to each other and are switching identical IGBTs.
VOUT1
VOUT2 Q2 OFF
Q1 ON
tPHLMAX
tPLHMAX
tPLHMIN
ILED2
ILED1
Q1 OFF VOUT1
Q2 ON
VOUT2
Q1 ON
tPHLMIN
tPHLMAX
Q2 OFF
Q1 OFF
Q2 ON
PDDMIN = -10 ns
= Minimum Dead Time
ILED2
Figure 39. Anti-Cross to prevent shoot through
ILED1
tPLHMIN
tPLHMAX
Maximum Dead Time
= (tPHLMAX tPHLMIN) + (tPLHMAX tPLHMIN)
= (tPHLMAX tPLHMIN) + (tPHLMIN tPLHMAX)
= PDDMAX PDDMIN
= 350 (-350) = 700 ns
VOUT1
Q1 ON
tPHLMIN
Figure 41. HCPL-3120 maximum dead time
Q1 OFF
VOUT2
Q2 OFF
tPLHMAX
tPLHMIN
Q2 ON
ILED2
PDDMAX = -200 ns
= Minimum Dead Time
Figure 40. Determining maximum dead time
18
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