HCNW 4504 PDF

HCNW Broadcom / Avago High Speed Optocouplers 1Ch 12mA mW datasheet, inventory & pricing. The HCPL and HCPL contain a GaAsP LED while the. HCPL-J and HCNW contain an AlGaAs LED. The LED is optically coupled to an. Buy Broadcom HCNW# in Avnet Americas. View Substitutes & Alternatives along with datasheets, stock, pricing and search for other Transistor .

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To ensure this, the turn-on of the optocoupler should be delayed by an amount no less than tPLHmax – tPHLminwhich also happens to be the maximum data sheet value for the propagation delay difference specification, tPLH – tPHL.

(PDF) HCNW4504 Datasheet download

The LED is optically coupled to an integrated high gain photo detector. Device considered a two-terminal device: The difference between the maximum and minimum values depends directly on the total spread in propagation delays and sets the limit on how good the worst-case dead time can be for a given design.

Pins 1, 2, 3, and 4 shorted together and Pins 5, 6, 7, and 8 shorted together. There are recommended techniques such as grooves and ribs which may be used on a printed circuit board hxnw achieve desired creepage and clearances.

The importance of these specifications is illustrated in Figure Use of a 0. Separate connections for the photodiode bias and outputtransistor collector increase the speed up to a hundred times that of a conventional phototransistor coupler by reducing the base collector capacitance.

HCNW 데이터시트(PDF) – Agilent(Hewlett-Packard)

Creepage and clearance distances will also change depending on factors such as pollution degree and insulation level. The LED signal to turn on Q2 should be delayed enough so that an optocoupler with the very fastest turn-on propagation delay tPHLmin will never turn on before an optocoupler with the very slowest turn-off propagation delay tPLHmax turns off. It is important to maintain accurate LED turn-on delays because delays shorter than tPLH – tPHL max may allow shootthrough currents, while longer delays will increase the worst-case dead time.

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See Option data sheet for more information. The timing illustrated in Figure 17 assumes that the power transistor turns on when the optocoupler LED turns on. Extremely large currents will flow if there is any overlap in their conduction during switching transitions, potentially damaging the transistors and even the surrounding circuitry. For technical assistance call: 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.

HCNW4504#300

Contact Agilent sales representative or authorized distributor for information. However, once mounted on a printed circuit board, minimum creepage and clearance requirements must be met as specified for individual equipment standards. Current Transfer Ratio vs. Maintenance of the safety data shall be ensured by means of protective circuits.

Minimizing this dead time is an important design goal for an inverter designer.

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These optocouplers are suitable for “safe electrical isolation” only within the safety limit data. Therefore, optocouplers with tight propagation delay specifications and not just shorter delays or lower pulse-width distortion can achieve short dead times in power inverters.

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Under TTL load and drive conditions: These dimensions are needed as a starting point for the equipment designer when determining the circuit insulation requirements.

F bypass capacitor between pins 5 and 8 is recommended. Most inverters are designed such that the power transistor turns on when the optocoupler LED turns on; this ensures that both power transistors will be off in the event of a power loss in the control circuit. Inverters can also be designed such that the power transistor turns off when the optocoupler LED turns on; this type of design, however, requires additional fail-safe circuitry to turn off the power transistor if an over-current condition is detected.

The Input-Output Momentary Withstand Voltage is a dielectric voltage rating that should not be interpreted as an input-output continuous voltage rating. Although tPLH-tPHL max tells the designer how much delay is needed to prevent shoot-through current, it is insufficient to tell the designer how much dead time a design will have. When inverter power transistors switch Q1 and Q2 in Figure 17it is essential that they never conduct at the same time.

F bypass capacitor connected between Pins 5 and 8 is recommended. An insulating layer hcne a LED and an integrated photodetector provide electrical insulation between input and output.

Calculating the maximum dead time is slightly more complicated.

Option data sheets available. Logic High Output Current vs. Use of nonchlorine activated fluxes is highly recommended.

DC and Pulsed Transfer Characteristics. Propagation Delay Time vs.

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