參數(shù)資料
型號(hào)： 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(yè)數(shù)： 28/44頁(yè)
文件大?。?/td> 496K
代理商： MB3893APFT
MB3893A
28
I
POWER SUPPLY CONTROL UNIT TIMING CHART
1. Power Supply Drop Detection 1
As Figure 1 shows, there is a “don’t care zone” where VCC voltage is below 2 V. When VCC voltage is above
VCCE voltage (2.75 V (Typ.)), the VCONT terminal (pin 16) goes to “H” level, and after a delay time (t
R
) the
OUT1 terminal (pin 29), the OUT2 terminal (pin 30), and the OUT4 terminal (pin 22) output their regulated
voltages. When VCC voltage falls below VCCD voltage (2.50 V (Typ.)), a power supply drop detection is deter-
mined and the VCONT terminal goes to “L” level, and therefore the OUT1, OUT2, and OUT4 terminals also go
to “L” level. If the VCC voltage rises again before falling below 2 V, the OUT1, OUT2, and OUT4 terminals will
once again output their regulated voltages once VCC exceeds the VCCR voltage (3.50 V (Typ.))
V
CC
VDET
VCONT
OUT1,
OUT2,
OUT4
VCCR
VCCE
VCCD
2.0 V
1
0 V
t
R
2
t
R
2
: Don't care zone
: Out of regulation
3.1 V
*1: Initial cutoff determination level
*2: t
R1
< t
R
< t
R2
(IC internal)
Figure 1. Power Supply Cutoff Sensor 1
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