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參數(shù)資料
| 型號： | MB3825APFV |
| 廠商： | FUJITSU LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6-ch DC/DC Converter IC With Synchronous Rectifier |
| 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)： | 24/39頁 |
| 文件大小： | 465K |
| 代理商： | MB3825APFV |
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MB3825A
24
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 SCP terminal (pin 13).
While the switching regulator load conditions are stable on all channels, or when the voltage level at the SCP terminal
is higher than the reference voltage, the short detection comparator output remains at “L” level, transistor Q3 is
turned on, and the CSCP terminal (pin 23) 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 SCP terminal falls below the reference voltage level, the output from the short detection comparator
on the corresponding channel or the input at the SCP pin goes to “H” level. This causes transistor Q3 to turn off
and the external short protection capacitor C
SCP
connected to the CSCP terminal to charge at 1.0
μ
A.
Short Detection Time (t
PE
)
t
PE
(sec) : 0.7
×
C
SCP
(
μ
F)
When the capacitor C
SCP
is charged to the threshold voltage V
TH
: 0.7 V the SR latch is set, and the external PNP
is turned off (inactive interval is set to 100%). At this point the SR latch input is closed and the C
SCP
pin is held at
input latch voltage (V
I
: 50 mV).
Figure 6. Protection timer-latch short protection circuit
External PNP transistor
A
13
SCP
R3
R2
R1
IN (C) 1
+
+
40
1.5 V
1.5 V
SCP
Comp.1
SCP
Comp.
26
23
C
SCP
CSCP
Q1
Q3
1
μ
A
+
1.5 V
UVLO
Ref
Power
ON/OFF
Soft Start
Comp.
Q2
CS
1
μ
A
Buff
29
CTL2
28
30
27
OUT1-6
OUT1-3
OUT2-1
OUT1-1
CTL1
VCC
VREF
4
56
43
46
bias
bias
Output
stage
Output
stage
Output
stage
Output
stage
S R
Timer-latch
short circuit
protection
circuit
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