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