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IRS2118PBF Datasheet(PDF) 11 Page - International Rectifier |
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IRS2118PBF Datasheet(HTML) 11 Page - International Rectifier |
11 / 26 page IRS211(7,71,8)(S) www.irf.com © 2008 International Rectifier 11 Tolerant to Negative VS Transients 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 5; here we define the power switches and diodes of the inverter. If the high-side switch (e.g., Q1 in Figures 6 and 7) switches off, while the 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 inverter. At the same instance, the voltage node VS swings from the positive DC bus voltage to the negative DC bus voltage. Q1 Q2 D1 D2 VS DC+ BUS DC- BUS Input Voltage To Load Figure 5: Half Bridge Circuit Q1 OFF Q2 OFF D1 D2 VS DC+ BUS DC- BUS IL Figure 6: Q1 conducting Figure 7: D2 conducting Also when the current flows from the load back to the inverter (see Figures 8 and 9), and Q2 switches on, the current commutation occurs from D1 to Q2. At the same instance, the voltage node VS swings from the positive DC bus voltage to the negative DC bus voltage. |
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