HCNW 4504 PDF

Fekree Most inverters are designed such that the power transistor turns on when the optocoupler 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. 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. These dimensions are needed as a starting point for the equipment designer when determining the circuit insulation requirements.

Author:Shaktiran Shaktit
Country:Mongolia
Language:English (Spanish)
Genre:Video
Published (Last):5 February 2017
Pages:397
PDF File Size:17.46 Mb
ePub File Size:10.99 Mb
ISBN:899-1-39702-766-9
Downloads:35244
Price:Free* [*Free Regsitration Required]
Uploader:Akilkree



Vilkis Contact Agilent sales representative or authorized distributor information. 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.

The timing illustrated in Figure 17 assumes that the power transistor turns on when the optocoupler LED turns on. The LED is optically coupled to an integrated high gain photo detector. 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.

Propagation Delay Time vs. 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 hcnww data sheet value for the propagation delay difference specification, tPLH — tPHL.

These dimensions are needed as a ncnw point for the equipment designer when determining the circuit insulation requirements. Current Transfer Ratio vs. 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. F bypass capacitor between pins 5 and 8 is recommended. Logic High Output Current vs. Pins 1, 2, 3, and 4 shorted together and Pins 5, 6, 7, and 8 shorted together.

Use of a 0. 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.

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. There are recommended techniques such as grooves and ribs which may be used on a printed circuit board to achieve desired creepage and clearances.

Use of nonchlorine activated fluxes is highly recommended. Calculating the maximum dead time is slightly more complicated. Under TTL load and drive conditions: When inverter power transistors switch Hcwn and Q2 in Figure 17it is essential that they never conduct at the same time.

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. For technical assistance call: The Input-Output Momentary Withstand Voltage a dielectric voltage rating that should not be interpreted as an input-output continuous voltage rating.

F bypass capacitor connected between Pins 5 and 8 is recommended. Creepage and clearance distances will also change depending on factors such as pollution degree and insulation level. Maintenance of the safety data shall be ensured by means of protective circuits. 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.

See Option data sheet for more information. 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. However, once mounted on a printed circuit board, minimum creepage and clearance requirements must be met as specified for individual equipment standards. Most inverters are designed such that the power transistor turns on when the optocoupler Hcns turns on; this ensures that both power transistors will be off in the event of a power loss in the control circuit.

The importance of these specifications is illustrated in Figure Device considered a two-terminal device: Related Posts

DUBARRY PHYSIQUE MPSI PDF

HCNW 4504 PDF

Vilkis Contact Agilent sales representative or authorized distributor information. 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. The timing illustrated in Figure 17 assumes that the power transistor turns on when the optocoupler LED turns on. The LED is optically coupled to an integrated high gain photo detector. 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.

APROKSIMASI KESALAHAN PDF

The LED ycnw 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. Pins 1, 2, 3, and 4 shorted together and Pins 5, 6, 7, and 8 shorted together. 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. F bypass capacitor between pins 5 and 8 is recommended.

CONTACTO INTIMO VIRGINIA SATIR LIBRO PDF

All the products will packing in anti-staticbag. Ship with ESD antistatic protection. We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet. After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity. Guarantees 1.

Related Articles