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HCPL-5151 Datasheet(PDF) 15 Page - Agilent(Hewlett-Packard) |
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HCPL-5151 Datasheet(HTML) 15 Page - Agilent(Hewlett-Packard) |
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15 / 16 page  15 IPM Dead Time and Propagation Delay Specifications. The HCPL- 5150 includes a Propagation Delay Difference (PDD) specification intended to help designers minimize “dead time” in their power inverter designs. Dead time is the time period during which both the high and low side power transistors (Q1 and Q2 in Figure 25) are off. Any overlap in Q1 and Q2 conduction will result in large currents flowing through the power devices between the high and low voltage motor rail. To minimize dead time in a given design, the turn on of LED2 should be delayed (relative to the turn off of LED1) so that under worst- case conditions, transistor Q1 has just turned off when transistor Q2 turns on, as shown in Figure 33. The amount of delay necessary to achieve this conditions is equal to the maximum value of the propagation delay difference specification, PDDMAX, which is specified to be 350 ns over the operating temperature range of -55 °C to 125°C. Delaying the LED signal by the maximum propagation delay difference ensures that the minimum dead time is zero, but it does not tell a designer what the maximum dead time will be. The maximum dead time is equivalent to the difference between the maximum and minimum propagation delay difference specifications as shown in Figure 34. The maximum dead time for the HCPL- 5150 is 700 ns (= 350 ns - (- 350 ns)) over an operating temperature range of - 55 °C to 125 °C. Note that the propagation delays used to calculate PDD and dead time are taken at equal temperatures and test conditions since the optocouplers under consideration are typically mounted in close proximity to each other and are switching identical IGBTs. Figure 33. Minimum LED Skew for Zero Dead Time Figure 34. Waveforms for Dead Time Calculations PDD* MAX = (tPHL - tPLH)MAX = tPHL MAX - tPLH MIN *PDD = PROPAGATION DELAY DIFFERENCE NOTE: FOR PDD CALCULATIONS THE PROPAGATION DELAYS ARE TAKEN AT THE SAME TEMPERATURE AND TEST CONDITIONS. V OUT1 ILED2 V OUT2 ILED1 Q1 ON Q2 OFF Q1 OFF Q2 ON tPHL MAX tPLH MIN MAXIMUM DEAD TIME (DUE TO OPTOCOUPLER) = (tPHL MAX - tPHL MIN) + (tPLH MAX - tPLH MIN) = (tPHL MAX - tPLH MIN) - (tPHL MIN - tPLH MAX) = PDD* MAX - PDD* MIN *PDD = PROPAGATION DELAY DIFFERENCE NOTE: FOR DEAD TIME AND PDD CALCULATIONS ALL PROPAGATION DELAYS ARE TAKEN AT THE SAME TEMPERATURE AND TEST CONDITIONS. V OUT1 I LED2 V OUT2 I LED1 Q1 ON Q2 OFF Q1 OFF Q2 ON tPHL MAX tPHL MIN tPLH MIN tPLH MAX (tPHL - tPLH) MAX = PDD* MAX Figure 35. Input Thermal Derating Curve, Depen- dence of case-to-ambient Thermal Resistance Figure 36. Output Thermal Derating Curve, Depen- dence of case-to-ambient Thermal Resistance -55 -25 5 35 95 125 65 TA - AMBIENT TEMPERATURE - oC 50 30 20 10 0 40 = 70 oC/W = 140 oC/W = 210 oC/W case-to-ambient thermal resistance 0 50 100 150 200 250 300 -55 -25 5 35 65 95 125 TA - AMBIENT TEMPERATURE - oC = 70 oC/W = 140 oC/W = 210 oC/W case-to-ambient thermal resistance |
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