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ST1S14 Fiches technique(PDF) 30 Page - STMicroelectronics

No de pièce ST1S14
Description  Power good open collector output
PDF  46 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST1S14 Fiches technique(HTML) 30 Page - STMicroelectronics

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Figure 16. Minimum VFB for effective pulse-by-pulse protection over VIN
As a consequence of VIN > 12 V the pulse-by-pulse current protection (in the worst case
scenario which is the minimum VOSET) may not be effective to limit the inductor current to
the peak current limitation over the entire FB range 300 mV < VFB < 1.22 V.
In fact, at higher input voltage,
ΔI
L TON may be higher than
ΔI
L TOFF and so the inductor
current could escalate. The system typically meets Equation 31 at a current level higher
than the nominal value thanks to the voltage drop across stray components.
Figure 17. IL diverging triggers hiccup protection (VIN = 48 V)
In most of the application conditions the pulse-by-pulse current limitation is effective in
limiting the inductor current.
Whenever the current escalates, a second level current protection called “hiccup mode” is
enabled. In case the hiccup current level (6.2 A typ.) is triggered the switching activity is



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