irs2608d International Rectifier Corp., irs2608d Datasheet - Page 8

• Manufacturer Part Number: irs2608d
• Description: Half-bridge Driver
• Manufacturer: International Rectifier Corp.

Switching and Timing Relationships
The relationships between the input and output signals of the IRS2608D are illustrated below in Figures 3, 4. From
these figures, we can see the definitions of several timing parameters (i.e., PW
with this device.
Deadtime
This family of HVICs features integrated deadtime protection circuitry. The deadtime for these ICs is fixed; other ICs within IR’s HVIC
portfolio feature programmable deadtime for greater design flexibility. The deadtime feature inserts a time period (a minimum
deadtime) in which both the high- and low-side power switches are held off; this is done 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 inserter whenever the
external deadtime is shorter than DT; external deadtimes larger than DT are not modified by the gate driver. Figure 5 illustrates the
deadtime period and the relationship between the output gate signals.
The deadtime circuitry of the IRS2608D is matched with respect to the high- and low-side outputs. Figure 5 defines the two deadtime
parameters (i.e., DT
maximum difference between DT
Matched Propagation Delays
The IRS2608D family of HVICs is designed with propagation delay matching circuitry. With this feature, the IC’s
response at the output to a signal at the input requires approximately the same time duration (i.e., t
low-side channels and the high-side channels; the maximum difference is specified by the delay matching parameter
(MT). The propagation turn-on delay (t
www.irf.com
LO-HO
and DT
LO-HO
HO-LO
and DT
); the deadtime matching parameter (MDT) associated with the IRS2608D specifies the
Figure 4: Input/output timing diagram
ON
Figure 3: Switching time waveforms
) of the IRS2608D is matched to the propagation turn-on delay (t
HO-LO
.
IN
, PW
OUT
, t
ON
IRS2608DSPbF
, t
OFF
, t
R
ON
, and t
, t
OFF
OFF
F
) for both the
).
) associated
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