IRS2608DSPBF International Rectifier, IRS2608DSPBF Datasheet - Page 14

• Manufacturer Part Number: IRS2608DSPBF
• Description: IC DVR HALF BRIDGE 600V 8-SOIC
• Manufacturer: International Rectifier

Specifications of IRS2608DSPBF

• Configuration: Half Bridge
• Input Type: Differential
• Delay Time: 250ns
• Current - Peak: 200mA
• Number Of Configurations: 1
• Number Of Outputs: 2
• High Side Voltage - Max (bootstrap): 600V
• Voltage - Supply: 10 V ~ 20 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

IRS2608DSPbF
Figure 13: D3 conducting
Figure 14: Q4 conducting
However, in a real inverter circuit, the V
voltage swing does not stop at the level of the negative DC bus, rather it
S
swings below the level of the negative DC bus. This undershoot voltage is called “negative V
transient”.
S
The circuit shown in Figure 15 depicts one leg of the three phase inverter; Figures 16 and 17 show a simplified
illustration of the commutation of the current between Q1 and D2. The parasitic inductances in the power circuit from the
die bonding to the PCB tracks are lumped together in L
and L
for each IGBT. When the high-side switch is on, V
is
C
E
S1
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
(the load is not shown in these figures). This current flows from the DC- bus (which
S1
is connected to the COM pin of the HVIC) to the load and a negative voltage between V
and the DC- Bus is induced
S1
(i.e., the COM pin of the HVIC is at a higher potential than the V
pin).
S
Figure 15: Parasitic Elements
Figure 16: V
positive
Figure 17: V
negative
S
S
In a typical motor drive system, dV/dt is typically designed to be in the range of 3-5 V/ns. The negative V
transient
S
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. An indication of the IRS2608D’s robustness can be seen in Figure 18, where there is represented the
IRS2608D Safe Operating Area at V
=15V based on repetitive negative V
spikes. A negative V
transient voltage
BS
S
S
falling in the grey area (outside SOA) may lead to IC permanent damage; viceversa unwanted functional anomalies or
permanent damage to the IC do not appear if negative Vs transients fall inside SOA.
At V
=15V in case of -V
transients greater than -16.5 V for a period of time greater than 50 ns; the HVIC will hold by
BS
S
design the high-side outputs in the off state for 4.5 s.
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