IRS21844SPBF International Rectifier, IRS21844SPBF Datasheet - Page 8

• Manufacturer Part Number: IRS21844SPBF
• Description: IC DRIVER HALF-BRIDGE 14-SOIC
• Manufacturer: International Rectifier

Specifications of IRS21844SPBF

• Configuration: Half Bridge
• Input Type: Non-Inverting
• Delay Time: 680ns
• Current - Peak: 1.9A
• 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: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Tolerant to Negative V
A common problem in today’s high-power switching converters is the transient response of the switch
node’s voltage as the power switches transition on and off quickly while carrying a large current. A typical
half bridge circuit is shown in Figure 6; here we define the power switches and diodes of the inverter.
If the high-side switch (e.g., Q1 in Figures 7 and 8) switches off, while the phase current is flowing to a
load, a current commutation occurs from high-side switch (Q1) to the diode (D2) in parallel with the low-
side switch of the same inverter leg. At the same instance, the voltage node V
DC bus voltage to the negative DC bus voltage.
Also when the phase current flows from the load back to the inverter (see Figures 9 and 10), and Q4
switches on, the current commutation occurs from D3 to Q4. At the same instance, the voltage node, V
swings from the positive DC bus voltage to the negative DC bus voltage.
Figure 7: Q1 conducting
OFF
ON
Q1
Q2
DC+ BUS
V
DC- BUS
S 1
S
Transients
D2
I
U
Voltage
Figure 6: Half Bridge Circuit
Input
DC+ BUS
DC- BUS
IRS2184/IRS21844(S)PbF
Q1
Q2
V
S
D1
D2
Load
To
S1
, swings from the positive
Figure 8: D2 conducting
OFF
OFF
Q1
Q2
DC+ BUS
V
DC- BUS
S1
D1
D2
I
U
S2
,
8