HCPL3180 datasheet(18/19 Pages) HP

18 / 19 page

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

35. 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 90 ns over the

operating temperature range of

-40 °C to +100 °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 specification as

shown in Figure 36. The

maximum dead time for the

HCPL-3180 is 180 ns (= 90 ns-(-

90 ns)) over the operating

temperature range of –40 °C to

+100 °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 36. Waveforms for Dead Time

HCPL3180 Datasheet(PDF) 18 Page - Agilent(Hewlett-Packard)

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