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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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HCPL-3150 Fiches technique(PDF) 10 Page - Agilent(Hewlett-Packard) |
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HCPL-3150 Fiches technique(HTML) 10 Page - Agilent(Hewlett-Packard) |
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10 / 15 page  1-206 Figure 25. Recommended LED Drive and Application Circuit. Applications Information Eliminating Negative IGBT Gate Drive To keep the IGBT firmly off, the HCPL-3150 has a very low maximum VOL specification of 1.0 V. The HCPL-3150 realizes this very low VOL by using a DMOS transistor with 4 Ω (typical) on resistance in its pull down circuit. When the HCPL-3150 is in the low state, the IGBT gate is shorted to the emitter by Rg + 4 Ω. Minimizing Rg and the lead inductance from the HCPL-3150 to the IGBT gate and emitter (possibly by mounting the HCPL-3150 on a small PC board directly above the IGBT) can eliminate the need for negative IGBT gate drive in many applications as shown in Figure 25. Care should be taken with such a PC board design to avoid routing the IGBT collector or emitter traces close to the HCPL- 3150 input as this can result in unwanted coupling of transient signals into the HCPL-3150 and degrade performance. (If the IGBT drain must be routed near the HCPL-3150 input, then the LED should be reverse-biased when in the off state, to prevent the transient signals coupled from the IGBT drain from turning on the HCPL-3150.) Figure 24. CMR Test Circuit and Waveforms. 0.1 µF VCC = 15 to 30 V 47 Ω 1 3 IF = 7 to 16 mA VO + – + – 2 4 8 6 7 5 10 KHz 50% DUTY CYCLE 500 Ω 3 nF IF VOUT tPHL tPLH tf tr 10% 50% 90% Figure 23. tPLH, tPHL, tr, and tf Test Circuit and Waveforms. 0.1 µF VCC = 30 V 1 3 IF VO + – + – 2 4 8 6 7 5 A + B VCM = 1500 V 5 V VCM ∆t 0 V VO SWITCH AT B: IF = 0 mA VO SWITCH AT A: IF = 10 mA VOL VOH ∆t VCM δV δt = + HVDC 3-PHASE AC - HVDC 0.1 µF VCC = 18 V 1 3 + – 2 4 8 6 7 5 270 Ω HCPL-3150 +5 V CONTROL INPUT Rg Q1 Q2 74XXX OPEN COLLECTOR |
Numéro de pièce similaire - HCPL-3150 |
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Description similaire - HCPL-3150 |
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