參數(shù)資料
型號(hào)： MB3887
廠商： Fujitsu Limited
英文描述： DC/DC Converter IC for Charging Li-ion battery
中文描述： 直流/直流轉(zhuǎn)換器集成電路充電鋰離子電池
文件頁(yè)數(shù)： 19/33頁(yè)
文件大?。?/td> 383K
代理商： MB3887
MB3887
19
■
METHOD OF SETTING THE SOFT-START TIME
For preventing rush current upon activation of IC, the IC allows soft-start using the capacitor (Cs) connected to
the CS terminal (pin 22) .
When CTL terminal (pin 14) is placed under “H” level and IC is activated (V
CC
≥
UVLO threshold voltage) , Q2
is turned off and the external soft-start capacitor (Cs) connected to the CS terminal is charged at 10
μ
A.
Error Amp output (FB3 terminal (pin 15) ) is determined by comparison between the lower voltage of the two
non-reverse input terminals (4.2 V and CS terminal voltage) and reverse input terminal voltage (
INE3 terminal
(pin 16) voltage) . Within the soft-start period (CS terminal voltage
<
4.2 V) , FB3 is determined by comparison
between
INE3 terminal voltage and CS terminal voltage, and DC/DC converter output voltage goes up propor-
tionately with the increase of CS terminal voltage caused by charging on the soft-start capacitor.Soft-start time
is found by the following formula :
Soft-start time : ts (time to output 100
%
)
t
S
(s) : 0.42
×
C
S
(
μ
F)
=
4.9 V
=
4.2 V
=
0 V
CS terminal voltage
Comparison with Error Amp block
INE3
voltage.
Soft-start time: ts
15
16
22
+
+
UVLO
VREF
10
μ
A
10
μ
A
Q2
4.2 V
Error
Amp3
FB3
INE3
CS
C
S
Soft-start circuit
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參數(shù)描述
MB3887_06 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:DC/DC Converter IC for Charging Li-ion battery
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MB3889 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type
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