AN436 APPLICATION NOTE

2/9

Figure 1. Voltage across the secondary winding for a rectangular pulse across the primary

The rise time tr

This parameter tr defines the rise time of the output pulse as shown in Figure 2.

Figure 2. Specification of the rise time at the output of the transformer

Figure 3 shows the diagram of the secondary of the transformer.

Figure 3. Equivalent diagram of the transformer

GATE PULSE

Peak value

The transformer ratio and the power supply of the primary winding define the secondary voltage. With the

equivalent diagram and triac gate characteristics it is possible to determine the output current. This has to

t

2

t

tr

U N2/N1

2

2