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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. However, once mounted on a printed circuit board, minimum creepage and clearance requirements must be met as specified for individual equipment standards. Creepage and clearance distances will also change depending on factors such as pollution degree and insulation level.

See Applications section for additional details on limiting IOH peak.

This results in lower peak currents more margin than predicted by this analysis. Pins 1 and 4 need to be connected to LED common. Temperature Figure 3 VOH vs. Maintenance of the safety data shall be ensured by means of protective circuits. The Input-Output Momentary Withstand Voltage is a dielectric voltage rating that should not be interpreted as an input-output continuous voltage rating. For the continuous voltage rating refer to your equipment level safety specification or Broadcom Ltd.

Techniques to keep the LED in the proper state are discussed in the next two sections.


AVEN — March 21, 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.

These dimensions are needed as a starting point for the equipment designer when determining the circuit insulation requirements.

HCPL-3120/J312, HCNW3120

Data subject hcbw3120 change. Figure 33 is an alternative drive circuit datasneet, like the recommended application circuit Figure 25does achieve ultra high CMR performance by shunting the LED in the off state. The thermal resistance values given in this model can be used to calculate the temperatures at each node for a given operating condition. All other brand and product names may be trademarks of their respective companies.

Contact your Avago Technologies sales representative or authorized distributor for information. However, this shield does not eliminate the capacitive coupling between the LED and optocoupler pins dafasheet as shown in Figure Lab 9 in this note. 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 rails.

In this test, VOH is measured with a dc load current. The LED is optically coupled to an integrated circuit with a power output stage.

Datasueet Flashcards Grammar checker. Note that xatasheet propagation delays used to calculate PDD fatasheet 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.


To order, choose a part number from the part number column and combine datasheet the desired option from the option column to form an order entry. 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 high operating voltage range of the output stage provides the drive voltages required by gate controlled devices. Contact an Avago Technologies sales representative or authorized distributor. This is achieved by overdriving the LED current beyond the input threshold so that it is not pulled below the threshold during a transient.

For creepage, the shortest distance path along the surface of a printed circuit board between the solder fillets of the input and output leads must be considered. Device considered a two-terminal device: Option data sheets are available. Minimum External Tracking L Creepage 7.

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 When negative gate datazheet is not used VEE in the previous equation is equal to zero volts.