參數(shù)資料
型號(hào): LM26480QSQ-CF/NOPB
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 穩(wěn)壓器
英文描述: 2.4 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, QCC24
封裝: 4 X 4 MM, 0.80 MM HEIGHT, ROHS COMPLIANT, LLP-24
文件頁數(shù): 11/30頁
文件大?。?/td> 2455K
代理商: LM26480QSQ-CF/NOPB
NPOR Mask Window
30040408
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 (5 ms) counter
delay is triggered off the EN2 rising edge. NPOR is still held
HIGH for the duration of the mask, whereupon the nPOR sta-
tus 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.
19
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LM26480
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