參數(shù)資料
型號(hào)： MB3881
廠商： Fujitsu Limited
英文描述： 8-ch DC/DC Converter IC with Synchronous Rectifier for Voltage Step-up and Step-down
中文描述： 8通道DC / DC變換器的同步整流集成電路的電壓升壓和降壓
文件頁(yè)數(shù)： 18/40頁(yè)
文件大小： 509K
代理商： MB3881
MB3881
18
2.
Channel Control Function
Channels are turned on and off depending on the voltage levels at the CTL-1 terminal (pin 28), CTL-2 terminal
(pin 29), CTL-3 terminal (pin 30),and CTL-4 terminal (pin 31).
Channel On/Off Setting Conditions
×
: Undefined
3.Protective Functions
(1) Timer-latch short-circuit protection circuit
The short-circuit detection comparator in each channel detects the output voltage level and, if any channel output
voltage falls below the short-circuit detection voltage, the timer circuits is actuated to start charging the external
capacitor C
SCP
connected to the CSCP terminal (pin 26).
When the capacitor voltage reaches about 0.70 V, the circuit is turned off the output transistor and sets the dead
time to 100%.
To reset the actuated protection circuit, turn the power supply on back. (See “SETTING TIME CONSTANT FOR
TIMER-LATCH SHORT-CIRCUIT PROTECTION CIRCUIT”.)
(2) Undervoltage lockout protection circuit
The transient state or a momentary decrease in supply voltage, which occurs when the power supply is turned
on, may cause the IC to malfunction, resulting in breakdown or degradation of the system. To prevent such
malfunctions, the undervoltage lockout protection circuit detects a decrease in internal reference voltage with
respect to the power supply voltage, turns off the output transistor, and sets the dead time to 100% while holding
the CSCP terminal (pin 26) at the “L” level.
The circuit restores the output transistor to normal when the supply voltage reaches the threshold voltage of the
undervoltage lockout protection circuit.
Voltage level at CTL pin
Channel on/off state
CTL-1
CTL-2
CTL-3
CTL-4
Power
CH8
CH1, 3, 4
CH2
CH5, 6
CH7
L
×
×
×
L
OFF (Standby state)
H
L
L
ON
OFF
OFF
OFF
H
ON
H
L
ON
OFF
H
ON
H
L
L
ON
OFF
OFF
H
ON
H
L
ON
OFF
H
ON
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