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IRS2334SPbF/MPbF
Switching and Timing Relationships
The relationship between the input and output signals of the IRS2334 HVIC is shown in Figure 3. The definitions
of some of the relevant parameters associated with the gate driver input to output transmission are given.
LIN
or HIN
50%
PW IN
50%
t ON
t R
PW OUT
t OFF
t F
LO
or HO
90%
10%
90%
10%
Figure 3: Switching time waveforms
During interval A of Figure 4 the HVIC receives the command to turn on both the high and low side switches at
the same time; correspondingly, the shoot-through protection prevents the high and low side signals HO and LO
turn on by keeping them low.
Figure 4: Input/output timing diagram
Deadtime
The IRS2334 HVIC provides an integrated deadtime protection circuitry. The deadtime interval for this HVIC is
fixed; while other ICs within IR’s HVIC portfolio feature programmable deadtime for greater design flexibility. The
deadtime feature inserts a time interval in which both the gate driver outputs LO and HO are held off; to ensure
that the power switch being turned off has fully turned off before the second power switch is turned on. This
minimum deadtime is automatically inserted whenever the external deadtime commanded by the host
microcontroller is shorter than DT, while external deadtimes larger than DT are not modified by the gate driver.
Figure 7 illustrates the deadtime interval definition and the relationship between the output gate signals.
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