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參數(shù)資料
| 型號(hào)： | MB3821 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 2-ch DC/DC Converter IC With Synchronous Rectifier |
| 中文描述： | 2通道DC / DC轉(zhuǎn)換集成電路整流同步 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 273K |
| 代理商： | MB3821 |
14
MB3821
I
METHOD OF SETTING SOFT START TIME
To provide a soft start by preventing current surges at power-on, soft start capacitors (Cs1, Cs2) are connected to
both channels, the CS1 pin (pin 4) for CH1 and the CS2 pin (pin 21) for CH2.
When the IC is started (when the CTL pin (pin 18) goes to “H” level, and Vcc
≥
UVLO threshold voltage), transistors
Q2 and Q3 switch off and the CS1 and CS2 pins begin charging the external soft start capacitors (Cs1, Cs2) at 1
μ
A.
The error amplifier contributes to a soft start with the proportionate output voltage to the CS1 and CS2 pin voltage
regardless of the load current on the DC/DC converter.
The soft start time can be calculated by the following formula.
Soft start time (time to 100% output)
t
S
(sec) : 1.26
×
C
S
(
μ
F)
+
+
1.26 V
Error
Amp.1
Error
Amp.2
22
C
SCP
CSCP
Q1
Q4
1
μ
A
+
2.1 V
UVLO
Power
ON/OFF
Latch
S
R
SCP Comp.
Q2
18
CTL
OUT2
2
OUT2
1
OUT1
2
OUT1
1
14
17
11
8
6
5
4
FB1
CS1
Cs1
IN1
1
μ
A
1
μ
A
bias
bias
+
+
1.26 V
Q3
19
20
21
FB2
CS2
Cs2
IN2
(2.5V)
Ref
Output stage
Output stage
Output stage
Output stage
Soft start circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB3821PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:2-ch DC/DC Converter IC With Synchronous Rectifier |
| MB3821PFV-G-BND(E1) | 制造商:Fujitsu 功能描述: |
| MB3825 | 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 |
| 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 |
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