HCPL-5151-100 データシートの表示（PDF） - Broadcom Corporation
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HCPL-5151-100 Datasheet PDF : 18 Pages
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HCPL-5150 and HCPL-5151,
DLA SMD 5962-04205
Data Sheet
Figure 31 Not Recommended Open Collector Drive Circuit
1
8
+5 V
CLEDP
2
7
Q1
3
CLEDN
6
ILEDN
4
5
SHIELD
Figure 32 Recommended LED Drive Circuit for Ultra-High CMR
1
8
+5 V
CLEDP
2
7
3
CLEDN
6
4
5
SHIELD
IPM Dead Time and Propagation Delay
Specifications
The HCPL-515x includes a Propagation Delay Difference (PDD)
specification intended to help designers minimize dead time in
their power inverter designs. Dead time is the time period
during which both the high and low side power transistors (Q1
and Q2 in Figure 25) are off. Any overlap in Q1 and Q2
conduction results in large currents flowing through the power
devices between the high and low voltage motor rail.
To minimize dead time in a given design, the turn on of LED2
should be delayed (relative to the turn off of LED1) so that
under worst-case conditions, transistor Q1 has just turned off
when transistor Q2 turns on, as shown in Figure 33. The
amount of delay necessary to achieve this condition is equal to
the maximum value of the propagation delay difference
specification, PDDMAX, which is specified to be 350 ns over the
operating temperature range of –55°C to +125°C.
Delaying the LED signal by the maximum propagation delay
difference ensures that the minimum dead time is zero, but it
does not tell a designer what the maximum dead time will be.
The maximum dead time is equivalent to the difference
between the maximum and minimum propagation delay
difference specifications as shown in Figure 34. The maximum
dead time for the HCPL-515x is 700 ns (= 350 ns – (–350 ns))
over an operating temperature range of –55°C to +125°C.
Note that the propagation delays used to calculate PDD and
dead time are taken at equal temperatures and test conditions
since the optocouplers under consideration are typically
mounted in close proximity to each other and are switching
identical IGBTs.
Figure 33 Minimum LED Skew for Zero Dead Time
I LED1
V OUT1
V OUT2
I LED2
Q1 ON
Q2 OFF
Q1 OFF
Q2 ON
tPHL MAX
tPLH MIN
PDD* MAX = (tPHL - tPLH)MAX = tPHL MAX - tPLH MIN
*PDD = PROPAGATION
DELAY DIFFERENCE
NOTE:
FOR PDD CALCULATIONS
THE PROPAGATION DELAYS
ARE TAKEN AT THE SAME
TEMPERATURE AND TEST
CONDITIONS.
Figure 34 Waveforms for Dead Time Calculations
I LED1
VOUT1
VOUT2
I LED2
Q1 ON
Q2 OFF
Q1 OFF
Q2 ON
tPHL MIN
tPHL MAX
(tPHL - tPLH) MAX
= PDD* MAX
tPLH MIN
tPLH MAX
MAXIMUM DEAD TIME
(DUE TO OPTOCOUPLER)
= (tPHL MAX - tPHL MIN) + (tPLH MAX - tPLH MIN)
= (tPHL MAX - tPLH MIN) - (tPHL MIN - tPLH 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.
Broadcom
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