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L6985F 데이터시트(PDF) 30 Page - STMicroelectronics

부품명 L6985F
상세설명  Internal current limiting
PDF  65 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6985F 데이터시트(HTML) 30 Page - STMicroelectronics

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Functional description
L6985F
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DocID027836 Rev 2
Figure 21. Valley current sense operation in overcurrent condition
Figure 21 shows the switching frequency reduction during the valley current sense
operation in case of an extremely low duty cycle (VIN = 38 V, fSW = 2 MHz short-circuit
condition).
In a worst case scenario (like in Figure 21) of the overcurrent protection the switch current is
limited to:
Equation 15
where IVALLEY_TH is the current threshold of the valley sensing circuitry (see Table 5:
Electrical characteristics on page 8) and TMASK_HS is the masking time of the high-side
switch 100 nsec. typ.).
In most of the overcurrent conditions the conduction time of the high-side switch is higher
than the masking time and so the peak current protection limits the switch current.
Equation 16
IMAX = IPEAK_TH
IMAX
IVALLEYTH
VIN VOUT
–
L
------------------------------ TMASKHS
+
=



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