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參數資料
| 型號： | MB3893APFV |
| 廠商： | FUJITSU LTD |
| 元件分類： | 電源管理 |
| 英文描述： | Bridge Rectifier; Current Rating:260A; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):Yes |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48 |
| 封裝： | PLASTIC, LQFP-48 |
| 文件頁數： | 36/44頁 |
| 文件大小： | 496K |
| 代理商： | MB3893APFV |
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MB3893A
36
c) t
<
1.5 s
The MB3893A power supply drop detection intervals are set to t
DET1
(10 s (Typ.)) and t
DET2
(1.5 s (Typ.)) so that, as
shown in Figure 9(c), when VCC goes from “H” level to “L” level, the OUT1 (pin 29), OUT2 (pin 30), and OUT4 (pin
22) terminals go to “L” level, and the XRST terminal (pin 35) also goes to “L” level. At this time, the VBDET1 ter-
minal (pin 34) and VBDET2 terminal (pin 33) also go to “L” level. When VCC drops for a fixed interval (t < 1.5 s),
and then returns to “H” level, the OUT1, OUT2, and OUT4 terminals after a delay interval (t
R2
) output their regulated
voltages, and the XRST terminal after a delay interval (t
POR
) goes to “H” level. During the interval between the VCC
drop and XRST terminal return to “H” level the VBDET1 terminal and VBDET2 terminal are in undefined state. Also
once the XRST terminal returns to “H” level the VBDET1 terminal is at “H” level and the VBDET2 terminal is at “L”
level. At this time, if the DRST terminal (pin 5) goes to “H” level, the VBDET2 terminal goes to “H” level. Note that
the DRST terminal must be at “H” level for at least an interval of 10
μ
s.
V
CC
CR2
VBDET2
(to
μ
p)
DRST
SUPPLY DROP
DETECTOR (1.5 s)
V
CC
VDET
OUT1,
OUT2,
OUT4
XRST
VBDET2
VBDET1
DRST
t
DROP
DON'T CARE
t
R2
t
POR
10
μ
s (Min.)
DON'T CARE
DON'T CARE
(IC internal)
Figure 9. Power Supply Drop Detector 2 (Initial power supply detector/Power supply drop detector)
c) t
<
1.5 s
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