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.
For product information and a complete list of distributors, please go to our website: www.avagotech.com
Avago, Avago Technologies, the A logo and R
2
Coupler™ are trademarks of Avago Technologies in the United States and other countries.
Data subject to change. Copyright © 2005-2011 Avago Technologies. All rights reserved. Obsoletes 5989-2118EN
AV02-0822EN - December 1, 2011
