參數(shù)資料
型號: MB3893APFT
廠商: FUJITSU LTD
元件分類: 電源管理
英文描述: Bridge Rectifier Module; Phases:Three; Repetitive Reverse Voltage Max, Vrrm:1600V; Forward Current Avg Rectified, IF(AV):25A; Current Rating:30A; Current, Ifsm:300A; Forward Current:30A; Forward Voltage:1.25V RoHS Compliant: Yes
中文描述: 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48
封裝: PLASTIC, TQFP-48
文件頁數(shù): 34/44頁
文件大?。?/td> 496K
代理商: MB3893APFT
MB3893A
34
9. Power Supply Drop Detector 2 (Initial power supply detector/power supply drop detector)
a) t
>
10 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(a), 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
terminal (pin 34) and VBDET2 terminal (pin 33) also go to “L” level. When VCC drops for a fixed interval (t > 10
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 “L” level and the
VBDET2 terminal is at “H” level. At this time, if the DRST terminal (pin 5) goes to “H” level, the VBDET1 terminal
also goes to “H” level. Note that the DRST terminal must be at “H” level for at least an interval of 10
μ
s.
VCC
CR1
VBDET1
(to
μ
p)
DRST
SUPPLY DROP
DETECTOR (10 s)
V
CC
VDET
(IC internal)
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
Figure 9. Power Supply Drop Detector 2 (Initial power supply detector/Power supply drop detector)
a) t
>
10 s
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