Figure 23. Minimum LED Skew for Zero Dead Time. Figure 24. Waveforms for Deadtime Calculation.
V
OUT1
V
OUT2
I
LED2
t
PLH MAX.
PDD* MAX. =
(t
PLH
-
t
PHL
)
MAX. =
t
PLH MAX.
-
t
PHL MIN.
t
PHL MIN.
I
LED1
Q1 ON
Q2 OFF
Q1 OFF
Q2 ON
*PDD = PROPAGATION DELAY DIFFERENCE
NOTE: THE PROPAGATION DELAYS USED TO CALCULATE
PDD ARE TAKEN AT EQUAL TEMPERATURES.
V
OUT1
V
OUT2
I
LED2
t
PLH MIN.
MAXIMUM DEAD TIME (DUE TO OPTOCOUPLER)
= (t
PLH MAX.
-
t
PLH MIN.
)
+
(t
PHL MAX.
-
t
PHL MIN.
)
= (t
PLH MAX.
-
t
PHL MIN.
) -
(t
PLH MIN.
-
t
PHL MAX.
)
= PDD* MAX. - PDD* MIN.
t
PHL MIN.
I
LED1
Q1 ON
Q2 OFF
Q1 OFF
Q2 ON
*PDD = PROPAGATION DELAY DIFFERENCE
t
PLH MAX.
t
PHL MAX.
PDD*
MAX.
MAX.
DEAD TIME
NOTE: THE PROPAGATION DELAYS USED TO CALCULATE THE MAXIMUM
DEAD TIME ARE TAKEN AT EQUAL TEMPERATURES.
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Data subject to change. Copyright © 2005-2011 Avago Technologies. All rights reserved.
AV02-3306EN - December 14, 2011
