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參數(shù)資料
| 型號： | MB3841PF-G-BND |
| 廠商： | FUJITSU LTD |
| 元件分類： | 電源管理 |
| 英文描述： | PERMASLEEVE WIRE MARKING SLEEVES |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | PLASTIC, SOP-8 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 122K |
| 代理商： | MB3841PF-G-BND |
11
MB3841
I
FUNCTIONAL DESCRIPTION
Current Limit Setting
The MB3841 provides highly accurate switching current setting, in the range 100 mA to 2 A
±
20% (with limit
setting current at 2 A) by placing resistance between the CURRENT and GND pins.
Because the setting is dependent on the V
IN
voltage, it is important that the appropriate resistance be connected
to the V
IN
pin.
The following approximation formula (1) may be used to calculate the limit setting when V
IN
= 5V.
For details, see “R
LIM
vs. Limit Current Characteristics” on p. 9.
7450
(R
LIM
[
])
1.1
When the switch limit level is exceeded, the switch turns off and then latch is set to protect the device.
At the same time the O.C output signal goes to “L” level to notify external systems.
When a “L” level signal is applied to the CONTROL switch, the latch is released, so that normal operation is
resumed at the next “H” level signal to the CONTROL switch.
Thermal Shutdown
The MB3841 has a thermal shutdown function which turns the switch off and sets the latch to protect the device
when junction temperature exceeds 125
°
C.
At the same time the O.C output signal goes to “L” level to notify external systems.
When a “L” level signal is applied to the CONTROL switch, the latch is released,so that normal operation is
resumed at the next “H” level signal to the CONTROL switch.
Slow Start
The on/off switching time of the MB3841 can be delayed by applying capacitance between the SS and GND
pins. Controlling the on time can soften surge current to the load side capacitance when power is turned on.
(t
ON
, t
Off
are measured at 90% of V
OUT
.)
The following approximation formula (2) may be used to set on time when V
IN
= 5 V.
For details, see “Css vs. t
ON
(SS) Characteristics” on p. 9.
DISCHARGE
The MB3841 has a DISCHARGE pin function that immediately discharges electric charge on the load side when
the switch is turned off.
I
SW
= [A]
....(1)
t
ON
= 0.87
×
10
–3
×
C
SS
[pF] + 0.3
....(2)
[ms]
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