參數(shù)資料
型號(hào): LP3907SQ-JIXI
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 穩(wěn)壓器
英文描述: 1.5 A DUAL SWITCHING CONTROLLER, 2100 kHz SWITCHING FREQ-MAX, QCC24
封裝: 4 X 4 MM, 0.8 MM HEIGHT, LLP-24
文件頁(yè)數(shù): 18/44頁(yè)
文件大?。?/td> 3058K
代理商: LP3907SQ-JIXI
NPOR Mask Window
30017813
If the EN1 and RDY1 are initiated in normal operation, then
nPOR is asserted and deasserted as explained above.
In Case 1, we see that case where EN2 and RDY2 are initi-
ated after triggered programmable delay. To prevent the
nPOR being asserted again, a masked window ( 5ms )
counter delay is triggered off the EN2 rising edge. nPOR is
still held HIGH for the duration of the mask, whereupon the
nPOR status afterwards will depend on the status of both
RDY1 and RDY2 lines.
In Case 2, we see the case where EN2 is initiated after the
RDY1 triggered programmable delay, but RDY2 never goes
HIGH (Buck2 never turns on). Normal operation operation of
nPOR occurs wilth respect to EN1 and RDY1, and the nPOR
signal is held HIGH for the duration of the mask window. We
see that nPOR goes LOW after the masking window has
timed out because it is now dependent on RDY1 and RDY2,
where RDY2 is LOW.
25
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LP3907
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