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AUIRS2336S
V S1 is below the DC+ voltage by the voltage drops associated with the power switch and the parasitic elements of
the circuit. When the high-side power switch turns off, the load current momentarily flows in the low-side
freewheeling diode due to the inductive load connected to V S1 (the load is not shown in these figures). This current
flows from the DC- bus (which is connected to the COM pin of the HVIC) to the load and a negative voltage between
V S1 and the DC- Bus is induced (i.e., the COM pin of the HVIC is at a higher potential than the V S pin).
Figure 30: Parasitic Elements
Figure 31: V S positive
Figure 32: V S negative
In a typical motor drive system, dV/dt is typically designed to be in the range of 3-5 V/ns. The negative V S transient
voltage can exceed this range during some events such as short circuit and over-current shutdown, when di/dt is
greater than in normal operation.
International Rectifier’s HVICs have been designed for the robustness required in many of today’s demanding
applications. The AUIRS2336S has been seen to withstand large negative V S transient conditions on the order of -
50 V for a period of 50 ns. An illustration of the AUIRS2336S performance can be seen in Figure 33. This
experiment was conducted using various loads to create this condition; the curve shown in this figure illustrates the
successful operation of the AUIRS2336S under these stressful conditions. In case of -V S transients greater then -20
V for a period of time greater than 100 ns, the HVIC is designed to hold the high-side outputs in the off state for 4.5
μ s in order to ensure that the high- and low-side power switches are not on at the same time.
Figure 33: Negative V S transient results for an International Rectifier HVIC
Even though the AUIRS2336S has been shown able to handle these large negative V S transient conditions, it is
highly recommended that the circuit designer always limit the negative V S transients as much as possible by careful
PCB layout and component use.
www.irf.com
27
? 2009 International Rectifier
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