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參數資料
| 型號： | MB3825 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 6-ch DC/DC Converter IC With Synchronous Rectifier |
| 中文描述： | 6通道DC / DC轉換同步整流集成電路 |
| 文件頁數： | 26/39頁 |
| 文件大小： | 465K |
| 代理商： | MB3825 |
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MB3825A
26
I
METHOD OF SETTING SOFT START TIME
Channels 1, 2, 4
To provide a soft start by preventing current surges at power-on, soft start capacitor (Cs) can be connected to the
CS terminal (pin 26).
When the IC is started (when the CTL1 terminal (pin 30) goes to “H” level, and Vcc
≥
UVLO threshold voltage),
transistors Q2 switches off and the CS terminal begins charging the external soft start capacitors (Cs) at 1.0
μ
A.
The error amplifier makes a soft start in a proportion to the output voltage to the CS teminal voltage regardless of
the load current on the DC/DC converter.
Note that the soft start time can be calculated by the following formula.
Soft start time (output rise time)
t
S
(sec) : 1.5
×
C
S
(
μ
F)
Figure 8. Soft start circuit
A
R3
R2
R1
IN (E )1
1.5 V
Error
Amp.1
26
23
C
SCP
CSCP
Q1
1
μ
A
+
+
+
1.5 V
UVLO
Soft Start
Comp.
Q2
CS
1
μ
A
Buff
29
OUT1-6
OUT1-3
OUT2-1
OUT1-1
CTL2
4
56
43
46
38
FB1
C
S
SCP
39
Ref
Power
ON/OFF
28
30
27
CTL1
VCC
VREF
bias
Output
stage
Output
stage
Output
stage
Output
stage
External PNP transistor
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MB3825A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:6-ch DC/DC Converter IC With Synchronous Rectifier |
| MB3825APFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:6-ch DC/DC Converter IC With Synchronous Rectifier |
| MB3827 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down |
| MB3827PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down |
| MB3828 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Pentium DC/DC Converter IC |
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