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This is achieved by overdriving the LED current beyond the input threshold so that it is not pulled below the threshold during a transient. Dead time is the time period during which both the high and low side power transistors Xatasheet and Q2 in Figure 25 are off. For creepage, datashfet shortest distance path along the surface of a printed circuit board between the solder fillets of the input and output leads must be considered.
When negative gate drive is not used VEE in the previous equation is equal to zero volts. Contact an Avago Technologies sales representative or authorized datasjeet. Minimum External Tracking L Creepage 7.
However, once mounted on a printed circuit board, minimum creepage and clearance requirements must be met as specified for individual equipment standards. To order, choose a part number from the part number column and combine with the desired option from the option column to form datasjeet order entry.
AVEN — March 21, There are recommended techniques such as grooves and ribs which may be used on a printed circuit board to achieve desired creepage and clearances. The thermal resistance values given in this model can be used to calculate the temperatures at each node for a given hcnw1320 condition.
Data subject to change. Device considered a two-terminal device: Creepage and clearance distances will also change depending on factors such as pollution degree and insulation level.
HCNW Datasheet(PDF) – AVAGO TECHNOLOGIES LIMITED
Documents Flashcards Grammar checker. Contact your Avago Technologies sales representative or authorized distributor for information. 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.
Lab 9 in this note. In this test, VOH is measured with a dc load current. Any overlap in Q1 and Q2 conduction will result in large currents flowing through the power devices between the high and low voltage motor rails.
Option data sheets are available.
HCNW Datasheet(PDF) – Agilent(Hewlett-Packard)
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. This capacitive coupling causes perturbations in the LED current during common mode transients and becomes the major source of CMR failures for a shielded optocoupler.
Maintenance of the safety data shall be ensured by means of protective circuits.
Temperature Figure 3 VOH vs. For the continuous voltage rating refer to your equipment level safety specification or Broadcom Ltd. The Input-Output Momentary Withstand Datssheet is a dielectric voltage rating that should not be interpreted as an input-output continuous voltage rating. This results in lower peak currents more margin than predicted by this analysis. See Hcnw3102 section for additional details on limiting IOH peak.
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 hccnw3120 Figure Figure 33 is an alternative drive circuit which, like the recommended application circuit Figure 25does achieve ultra high CMR performance by shunting the LED in the off state.
However, this shield does not eliminate the capacitive coupling between the LED and optocoupler pins 5—8 as shown in Figure Pins 1 and 4 need to be connected to LED common.
HCNW3120 Datasheet PDF
These dimensions are needed as a starting point for the equipment designer when determining the circuit insulation requirements. The high operating voltage range of the output stage provides the drive voltages required by gate controlled devices. Techniques to keep the LED in the proper state are discussed in the next two sections.
The LED is optically coupled to an integrated circuit with a power hxnw3120 stage. All other brand and product names may be trademarks of their respective companies.