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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 18/33頁 |
| 文件大?。?/td> | 383K |
| 代理商： | MB3887 |
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MB3887
18
3.
Soft-start block (SOFT)
Connecting a capacitor to the CS terminal (pin 22) prevents rush currents when the IC is turned on. Using an
error amplifier for soft-start detection makes the soft-start time constant, being independent of the output load
of the DC/DC converter.
Soft-Start Function
■
SETTING THE CHARGING VOLTAGE
The charging voltage (DC/DC output voltage) can be set by connecting external voltage setting resistors (R3,
R4) to the
INE3 terminal (pin 16) . Be sure to select a resistor value that allows you to ignore the on-resistor
(35
, 1mA) of the internal FET connected to the OUTD terminal (pin 11) . In standby mode, the charging
voltage is applied to OUTD termial. Therefore, output voltage must be adjusted so that voltage applied to OUTD
terminal is 17 V or less.
Battery charging voltage : V
O
V
O
(V)
=
(R3
+
R4)
/
R4
×
4.2 (V)
■
METHOD OF SETTING THE CHARGING CURRENT
The charge current (output limit current) value can be set with the voltage at the
+
INE1 terminal (pin 9) .
If a current exceeding the set value attempts to flow, the charge voltage drops according to the set current value.
Battery charge current setting voltage :
+
INE1
+
INE1 (V)
=
20
×
I1 (A)
×
R
S
(
)
■
METHOD OF SETTING THE TRIANGULAR WAVE OSCILLATION FREQUENCY
The triangular wave oscillation frequency can be set by the timing resistor (R
T
) connected the RT terminal (pin 17) .
Triangular wave oscillation frequency : f
OSC
f
OSC
(kHz) : 13630
/
R
T
(k
)
<Error Amp3>
+
+
4.2 V
R3
V
O
R4
INE3
OUTD
CS
16
B
11
22
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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 |
| MB3887PFV | 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 |
| MB3887PFV-G-BNDE1 | 制造商:Fujitsu 功能描述:Bulk |
| MB3888 | 制造商:FUJI 制造商全稱:Fuji Electric 功能描述:DC/DC Converter IC for Charging Li-ion Battery |
| 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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