HCPL-315J Datasheet, PDF (20/21 Pages) Agilent(Hewlett-Packard) – 0.5 Amp Output Current IGBT Gate Drive Optocoupler

20
1
8
+5 V
C_LEDP
2
7
3
6
Q1
C_LEDN
I_LEDN
4
5
SHIELD
Figure 32. Not Recommended Open Collector
Drive Circuit.
1
8
+5 V
C_LEDP
2
7
3
6
C_LEDN
4
5
SHIELD
Figure 33. Recommended LED Drive Circuit
for Ultra-High CMR.
I_LED1
I_LED1
V_OUT1
V_OUT2
Q1 ON
Q2 OFF
Q1 OFF
Q2 ON
V_OUT1
V_OUT2
Q1 ON
Q2 OFF
Q1 OFF
Q2 ON
I_LED2
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.
I_LED2
t_{PHL MIN}
t_{PHL MAX}
t_PLH
MIN
(t_PHL-t_PLH) _MAX
= PDD* MAX
t_{PLH MAX}
Figure 34. Minimum LED Skew for Zero Dead Time.
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.
Figure 35. Waveforms for Dead Time.