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參數(shù)資料
| 型號： | MB3885 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 1-channel DC/DC Converter IC with Synchronous Rectifier |
| 中文描述： | 1通道DC / DC變換器的同步整流集成電路 |
| 文件頁數(shù)： | 17/29頁 |
| 文件大小： | 239K |
| 代理商： | MB3885 |
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MB3885
17
I
SOFT START TIME SETTING
The soft start function prevents rush current events when the IC power is turned on, by connecting soft start
capacitors (Cs) to the CS terminal (pin 6) .
When the IC is activated (Vcc
≥
UVLO threshold voltage) , Q2 is off and the CS terminals begin charging the
externally connected soft start capacitors (Cs) at 10
μ
A.
Because the error Amp. output (FB) is determined by the ratio of the lower of the two non-inverted input terminals
(1.25 V, CS terminal voltage) to the inverted input terminal voltage (
INE) , the soft start interval (when CS
terminal voltage
<
1.25 V) FB is determined by the ratio of the
INE terminal voltage and CS terminal voltage.
Thus the DC/DC converter output voltage is in proportion to the rise in the CS terminal voltage as the soft start
capacitor connected to the CS terminal charges. The soft start time is determined by the following formula.
Soft start time (time to output 100
%
)
ts (s) : 0.125
×
Cs (
μ
F)
CS terminal voltage
2.3 V
1.25 V
0 V
Error. amp block comparison voltage
to
INE voltage
Soft start time ts
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| MB3886PFV | 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 |
| MB3887 | 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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