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L6986 bảng dữ liệu(PDF) 29 Page - STMicroelectronics

tên linh kiện L6986
Giải thích chi tiết về linh kiện  38 V, 2 A synchronous step-down switching regulator with 30 A quiescent current
PDF  68 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L6986 bảng dữ liệu(HTML) 29 Page - STMicroelectronics

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L6986
Functional description
68
Figure 18. Valley current sense operation in overcurrent condition
Figure 18 shows the switching frequency reduction during the valley current sense
operation in case of extremely low duty cycle (VIN = 38 V, fSW = 500 kHz short-circuit
condition).
In worst case scenario (like Figure 18) 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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