Obsolete

Product(s)

- Obsolete

Product(s)

AN1645 - APPLICATION NOTE

16/22

Figure 19c: Duty Cycle very fast variation

Figure 19-a shows the condition in which the duty cycle passes from 50% to 80% to 20% and back to

50% in four following cycles. In figure 19-b a magnification of OUTGate1 behavior is shown. Turn-off

time has very small delay with respect to the clock input. In figure 19-c a magnification of OUTGate2

behavior is shown. Turn-off time maintains the anticipation time even with very strong duty-cycle

variation assuring correct driving in heavy load transient conditions.

11. DEMOBOARD DESCRIPTION

The schematic of figure 20 presents a test board for the STSR2P. This board replaces forward and

freewheeling diodes in a Forward converter. The board includes all the components needed by the

STSR2P to operate. The board allows us to easily pass from diode rectification to synchronous

rectification in Forward converter applications. The components inside the dotted boxes, can be chosen

to implement different circuit configurations for Synchronization and for Inhibit pin. Table 3 shows a

detailed components selection.