IRS2608DSPBF データシートの表示（PDF） - International Rectifier

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IRS2608DSPBF

HALF-BRIDGE DRIVER

International Rectifier 

IRS2608DSPbF

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., PWIN, PWOUT, tON, tOFF, tR, and tF) associated

with this device.

LIN

50%

50%

ton

tr

toff

tf

90%

90%

LO

10%

10%

Figure 3: Switching time waveforms

Figure 4: Input/output timing diagram

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., DTLO-HO and DTHO-LO); the deadtime matching parameter (MDT) associated with the IRS2608D specifies the

maximum difference between DTLO-HO and DTHO-LO.

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., tON, tOFF) for both the

low-side channels and the high-side channels; the maximum difference is specified by the delay matching parameter

(MT). The propagation turn-on delay (tON) of the IRS2608D is matched to the propagation turn-on delay (tOFF).

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