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參數(shù)資料
| 型號： | MB3883 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down |
| 中文描述： | 6通道DC / DC轉換集成電路同步的電壓升壓和步驟整風式 |
| 文件頁數(shù)： | 26/39頁 |
| 文件大?。?/td> | 473K |
| 代理商： | MB3883 |
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MB3883
26
I
SETTING
TIME
CONSTANT FOR TIMER-LATCH SHORT-CIRCUIT PROTECTION CIRCUIT
The short detection comparator (SCP comparator) in each channel monitors the output voltage.
While the switching regulator load conditions are stable on all channels, the LOG_SCP output remains at “H”
level, transistor Q1 is turned on, and the CSCP terminal (pin 18) is held at “L” level.
If the load condition on a channel changes rapidly due to a short of the load, causing the output voltage to drop,
the output of the short detection comparator on that channel goes to “H” level. This causes transistor Q1 to be
turned off and the external short protection capacitor C
SCP
connected to the CSCP terminal to be charged at 1.0
μ
A.
Short detection time (t
PE
)
t
PE
(s) : 0.70
×
C
SCP
(
μ
F)
When the capacitor C
SCP
is charged to the threshold voltage (VTH : 0.70 V), the latch is set and the external
FET is turned off (dead time is set to 100%). At this point, the latch input is closed and the CSCP terminal is
held at “L” level.
Timer-latch short circuit protection circuit
+
A
R1
R2
IN1
1.0 V
SCP
Comp.1
+
0.9 V
SCP
Comp.6
OUT1
1
Drive
1
1
OUT1
2
Drive
1
2
OUT6
CTL
Drive
6
bias
bias
Ref
Power
ON/OFF CTL
S
R
UVLO
Q1
C
SCP
CSCP
1
μ
A
LOG_SCP
34
18
20
47
38
37
External FET
Timer-latch short
protection circuit
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MB3883_02 | 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 for Voltage Step-up and Step-down |
| MB3883PFV | 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 |
| MB3883PV | 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 |
| MB3885 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:1-channel DC/DC Converter IC with Synchronous Rectifier |
| MB3885PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:1-channel DC/DC Converter IC with Synchronous Rectifier |
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