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參數(shù)資料
| 型號： | MB3881PFF |
| 廠商： | FUJITSU LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8-ch DC/DC Converter IC with Synchronous Rectifier for Voltage Step-up and Step-down |
| 中文描述： | 0.2 A SWITCHING CONTROLLER, 800 kHz SWITCHING FREQ-MAX, PQFP64 |
| 封裝： | PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 26/40頁 |
| 文件大小： | 509K |
| 代理商： | MB3881PFF |
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MB3881
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 26) 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.
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.
Short detection time (t
PE
)
t
PE
(s) : 0.70
×
C
SCP
(
μ
F)
Timer-latch short circuit protection circuit
+
+
46
IN1
50
OUT1
1
R1
V
O
1
R2
1.0 V
SCP
Comp.1
+
7
8
+
IN8(C)
IN8(C)
SCP
Comp.8
Drive
1
1
51
OUT1
2
Drive
1
2
64
OUT8
28
CTL
1
Drive
8
bias
bias
Ref
Power
ON/OFF CTL
S
R
UVLO
Q1
C
SCP
CSCP
1
μ
A
26
LOG_SCP
External PNP transistor
Timer-latch short
protection circuit
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MB3881PFF-G-BND-E1 | 制造商:Fujitsu 功能描述:u[Xg/tCobN/obN/] 8 1.8V to 13V 64LQFP Tray |
| MB3881PMC2-G-BNDE1 | 制造商:Fujitsu 功能描述:Bulk |
| MB3882 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:2-channel DC/DC Converter IC with Synchronous Rectifier |
| MB3882PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:2-channel DC/DC Converter IC with Synchronous Rectifier |
| MB3882PFV-G-BND(E1) | 制造商:Fujitsu 功能描述: |
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