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HCPL3150 Folha de dados(PDF) 11 Page - Agilent(Hewlett-Packard) |
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HCPL3150 Folha de dados(HTML) 11 Page - Agilent(Hewlett-Packard) |
11 / 15 page 1-207 Figure 26. HCPL-3150 Typical Application Circuit with Negative IGBT Gate Drive. Selecting the Gate Resistor (Rg) to Minimize IGBT Switching Losses. Step 1: Calculate Rg Minimum From the IOL Peak Specifica- tion. The IGBT and Rg in Figure 26 can be analyzed as a simple RC circuit with a voltage supplied by the HCPL-3150. (VCC – VEE - VOL) Rg ≥ ––––––––––––––– IOLPEAK (VCC – VEE - 1.7 V) = –––––––––––––––– IOLPEAK ( 15 V + 5 V - 1.7 V) = –––––––––––––––––– 0.6 A = 30.5 Ω The VOL value of 2 V in the pre- vious equation is a conservative value of VOL at the peak current of 0.6 A (see Figure 6). At lower Rg values the voltage supplied by the HCPL-3150 is not an ideal voltage step. This results in lower peak currents (more margin) than predicted by this analysis. When negative gate drive is not used VEE in the previous equation is equal to zero volts. Step 2: Check the HCPL-3150 Power Dissipation and Increase Rg if Necessary. The HCPL-3150 total power dissipa- tion (PT) is equal to the sum of the emitter power (PE) and the output power (PO): PT = PE + PO PE = IF •VF •Duty Cycle PO = PO(BIAS) + PO (SWITCHING) = ICC•(VCC - VEE) + ESW(RG, QG)•f For the circuit in Figure 26 with IF (worst case) = 16 mA, Rg = 30.5 Ω, Max Duty Cycle = 80%, Qg = 500 nC, f = 20 kHz and TA max = 90 °C: PE = 16 mA•1.8 V•0.8 = 23 mW PO = 4.25 mA•20 V + 4.0 µJ•20 kHz = 85 mW + 80 mW = 165 mW > 154 mW (PO(MAX) @ 90°C = 250 mW −20C•4.8 mW/C) PO Parameter Description ICC Supply Current VCC Positive Supply Voltage VEE Negative Supply Voltage ESW(Rg,Qg) Energy Dissipated in the HCPL-3150 for each IGBT Switching Cycle (See Figure 27) f Switching Frequency PE Parameter Description IF LED Current VF LED On Voltage Duty Cycle Maximum LED Duty Cycle + HVDC 3-PHASE AC - HVDC 0.1 µF VCC = 15 V 1 3 + – 2 4 8 6 7 5 HCPL-3150 Rg Q1 Q2 VEE = -5 V – + 270 Ω +5 V CONTROL INPUT 74XXX OPEN COLLECTOR |
Nº de peça semelhante - HCPL3150 |
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Descrição semelhante - HCPL3150 |
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