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L6986H bảng dữ liệu(PDF) 30 Page - STMicroelectronics

tên linh kiện L6986H
Giải thích chi tiết về linh kiện  38 V, 2 A synchronous step-down switching regulator with 30 μA quiescent current
PDF  68 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L6986H bảng dữ liệu(HTML) 30 Page - STMicroelectronics

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Figure 29. Valley current sense operation in overcurrent condition
Figure 29. Valley current sense operation in overcurrent condition shows the switching frequency reduction during
the valley current sense operation in case of extremely low duty cycle (VIN = 12 V, fSW = 2 MHz short-circuit
condition).
In a worst case scenario (like Figure 29. Valley current sense operation in overcurrent condition) of the
overcurrent protection the switch current is limited to:
IMAX=IVALLEYTH+VIN−VOUT
L ⋅TMASKHS
(15)
where IVALLEY_TH is the current threshold of the valley sensing circuitry (see Table 5. Electrical characteristics)
and TMASK_HS is the masking time of the high-side switch 100 ns 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.
IMAX=IPEAK_TH
(16)
L6986H
Overcurrent protection
DS12905 - Rev 2
page 30/68



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