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)： 24/44頁(yè)
文件大?。?/td> 496K
代理商： MB3893APFT
MB3893A
24
I
FUNCTIONAL DESCRIPTION
1.
Power Supply Control Unit
(1) Reference Voltage Block
The reference voltage circuit uses the voltage supplied from the VCC terminal (pin 40) and generates a temper-
ature compensated reference voltage (1.23 V (Typ.)), for use as the reference voltage for the power supply control
unit.
(2) Constant Voltage Control Block (REG1)
This constant voltage control block (REG1) uses the voltage supplied from the reference voltage and generates
the output voltage (2.5 V) from the OUT1 terminal (pin 29).
An external load current can be obtained from the OUT1 terminal up to a maximum of 70 mA.
Also, by setting the ICONT terminal (pin 36) to “L” level the MB3893A can be placed in low current consumption
(standby) mode. In standby mode, REG1 is On with a maximum output load of 500
μ
A, and REG3 is Off. In this
state, ripple rejection and noise levels are not assured.
(3) Constant Voltage Control Block (REG2)
This constant voltage control block (REG2) uses the voltage supplied from the reference voltage and generates
the output voltage (1.8 V) from the OUT2 terminal (pin 30).
An external load current can be obtained from the OUT2 terminal up to a maximum of 50 mA.
Also, by setting the ICONT terminal (pin 36) to “L” level the MB3893A can be placed in low current consumption
(standby) mode. In standby mode, REG2 is On with a maximum output load of 500
μ
A, and REG3 is Off. In this
state, ripple rejection and noise levels are not assured.
(4) Constant Voltage Control Block (REG3)
This constant voltage control block (REG3) uses the voltage supplied from the reference voltage and generates
the output voltage from the OUT3 terminal (pin 27).
An external load current can be obtained from the OUT3 terminal up to a maximum of 70 mA.
Also, the output voltage can be changed to 1.9V or 2.2 V by mask option.
(5) Constant Voltage Control Block (REG4)
This constant voltage control block (REG4) uses the voltage supplied from the reference voltage and generates
the output voltage (2.5 V) from the OUT4 terminal (pin 22).
An external load current can be obtained from the OUT4 terminal up to a maximum of 60 mA.
Also, by setting the ICONT terminal (pin 36) to “L” level the MB3893A can be placed in low current consumption
(standby) mode. In standby mode, REG4 is On with a maximum output load of 500
μ
A, and REG3 is Off. In this
state, ripple rejection and noise levels are not assured.
(6) VREF1M
This block takes the reference voltage (1.23 V (Typ.)) generated by the reference voltage block, and uses a
voltage follower to produce a temperature compensated reference voltage (1.23 V (Typ.)) at the VREF1M terminal
(pin 10).
Also, an external load current can be obtained from the VREF1M terminal up to a maximum of 1 mA.
(7) ON/OFF Control Block
This block controls regulator On/Off switching according to the voltage levels of the POFF terminal (pin 18),
CONT2 terminal (pin 26), CONT5 terminal (pin 6), ICONT terminal (pin 36), DRST terminal (pin 5), XON terminal
(pin 11), ONOFF1 terminal (pin 9), ONOFF2 terminal (pin 17), and CONT1 terminal (pin 14).
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