AN1645 Datasheet, PDF (10/22 Pages) STMicroelectronics – STSR2P/STSR2PM SIMPLIFIES IMPLEMENTATION

AN1645 - APPLICATION NOTE
The blanking time value is determined by C11 and R25. This time has to last the necessary time to cover
the ringing caused by the primary switch turn off (Figure.13).
Figure 13: Ringing during turn off of the primary switch
roduct(s) _{Inhibit pin can be totally disabled providing a constant negative voltage between -100mV and -600mV to}
P _{the pin. A simple circuit which can be used to provide this voltage is showed in figure 14.}
lete ^{Figure 14: Disabling INHIBIT Pin}
) ^{- Obso} FREE WHEEL
FORWARD
roduct(s _+5V
P _Vcc ²
te ₄
le ^Ck
STSR2P ^{SETANT 3}
Obso ^{6 SGLGND}
R4
D2
INHIBIT ⁵
C3
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