參數(shù)資料
型號(hào)： MB3827PFV
廠商： FUJITSU LTD
元件分類： 穩(wěn)壓器
英文描述： 6-ch DC/DC Converter IC With Synchronous Rectification 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(yè)數(shù)： 30/41頁(yè)
文件大?。?/td> 557K
代理商： MB3827PFV
MB3827
30
I
METHOD OF SETTING TIME CONSTANT FOR TIMER-LATCH SHORT PROTECTION
CIRCUIT
The short detection comparator (SCP comparator) in each of the channels constantly compares the error
amplifier output level to the reference voltage and the
IN(C)8 terminal (pin 23).
While the switching regulator load conditions are stable on all channels, or when the voltage level at the
IN(C)8
pin is higher than the reference voltage, LOG_SCP output remains at “H” level, transistor Q1 is on, and the
CSCP terminal (pin 31) is held at input standby voltage (V
STB
: 50mV).
If the load conditions change rapidly due to a short-circuiting of load, causing the output voltage to drop, or if
the voltage at the
IN(C)8 terminal falls below the reference voltage level, the output from the short detection
comparator on the corresponding channel or the input at the
IN(C)8 terminal goes to “H” level. This causes
transistor Q1 to turn off and the external short protection capacitor C
SCP
connected to the CSCP pin to charge
at 1.0
μ
A.
Short Detection Time (t
PE
)
t
PE
(sec) : 0.68
×
C
SCP
(
μ
F)
When the capacitor C
SCP
is charged to the threshold voltage V
TH
: 0.68 V the SR latch is set, and the external
PNP is turned off (dead time is set to 100%). At this point the SR latch input is closed and the CSCP terminal
is held at input latch voltage (V
I
: 50 mV).
+
A
44
IN1
52
OUT1
1
R1
R2
1.0 V
SCP
Comp.1
+
23
IN (C) 8
1.26 V
SCP
Comp.8
Drive
1
1
50
OUT1
2
Drive
1
2
1
OUT7
27
CTL1
4, 7
Drive
7
bias
bias
Ref
Power
ON/OFF CTL
S
R
UVLO
Q1
C
SCP
CSCP
1
μ
A
31
LOG_SCP
External PNP transistor
Protection timer-latch short protection circuit
Timer-latch short
protection circuit
相關(guān)PDF資料
PDF描述
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參數(shù)描述
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