Datasheet

15
Figure 26. Minimum LED skew for zero dead time.
Figure 27. Waveforms for dead time.
t
PLH
MIN
MAXIMUM DEAD TIME
(DUE TO OPTOCOUPLER)
= (t
PHL MAX
- t
PHL MIN
) + (t
PLH MAX
- t
PLH MIN
)
= (t
PHL MAX
- t
PLH MIN
) – (t
PHL MIN
- t
PLH MAX
)
= PDD* MAX – PDD* MIN
*PDD = PROPAGATION DELAY DIFFERENCE
NOTE: FOR DEAD TIME AND PDD CALCULATIONS ALL PROPAGATION
DELAYS ARE TAKEN AT THE SAME TEMPERATURE AND TEST CONDITIONS.
V
OUT1
I
LED2
V
OUT2
I
LED1
Q1 ON
Q2 OFF
Q1 OFF
Q2 ON
t
PHL MIN
t
PHL MAX
t
PLH MAX
PDD* MAX
(t
PHL-
t
PLH
)
MAX
t
PHL MAX
t
PLH MIN
PDD* MAX = (t
PHL
- t
PLH
)
MAX
= t
PHL MAX
- t
PLH MIN
*PDD = PROPAGATION DELAY DIFFERENCE
NOTE: FOR PDD CALCULATIONS THE PROPAGATION DELAYS
ARE TAKEN AT THE SAME TEMPERATURE AND TEST CONDITIONS.
V
OUT1
I
LED2
V
OUT2
I
LED1
Q1 ON
Q2 OFF
Q1 OFF
Q2 ON