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Agilent 2. F bypass capacitor must be connected between pins 5 and 8. Wide operating VCC range: 15 to 30 Volts? Industrial inverters? The LED is optically coupled to an integrated circuit with a power output stage. The high operating voltage range of the output stage provides the drive voltages required by gate controlled devices. Contact Agilent sales representative or authorized distributor.
Option data sheets available. Measured from input terminals to output terminals, shortest distance path along body. Insulation thickness between emitter and detector; also known as distance through insulation. These dimensions are needed as a starting point for the equipment designer when determining the circuit insulation requirements. However, once mounted on a printed circuit board, minimum creepage and clearance requirements must be met as specified for individual equipment standards.
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. There are recommended techniques such as grooves and ribs which may be used on a printed circuit board to achieve desired creepage and clearances. 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. Parameter Symbol Device Min. Units Test Conditions Fig. Parameter Symbol Min. See Applications section for additional details on limiting IOH peak. In this test VOH is measured with a dc load current. Device considered a two-terminal device: pins 1, 2, 3, and 4 shorted together and pins 5, 6, 7, and 8 shorted together.
Pins 1 and 4 need to be connected to LED common. VOH vs. Figure 2. IOH vs. Figure 3. VOL vs. Figure 5. IOL vs. Figure 6. ICC vs.
Figure 8. IFLH vs. Propagation Delay vs. Figure Transfer Characteristics. Input Current vs. Forward Voltage. IOH Test Circuit.
IOL Test Circuit. VOH Test Circuit. VOL Test Circuit. VCM 0. This results in lower peak currents more margin than predicted by this analysis. When negative gate drive is not used VEE in the previous equation is equal to zero volts. The thermal resistance values given in this model can be used to calculate the temperatures at each node for a given operating condition. As shown by the model, all heat generated flows through qCA which raises the case temperature TC accordingly.
The value of qCA depends on the conditions of the board design and is, therefore, determined by the designer. Thermal Model. However, this shield does not eliminate the capacitive coupling between the LED and optocoupler pins as shown in Figure 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.
Techniques to keep the LED in the proper state are discussed in the next two sections. This is achieved by overdriving the LED current beyond the input threshold so that it is not pulled below the threshold during a transient. Figure 33 is an alternative drive circuit which, like the recommended application circuit Figure 25 , does achieve ultra high CMR performance by shunting the LED in the off state.
Under Voltage Lock Out. 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. Waveforms for Dead Time. 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.
The maximum dead time is equivalent to the difference between the maximum and minimum propagation delay difference specifications as shown in Figure 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.
AVAGO Black HCPL A3120 SMD Integrated Chips
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