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參數(shù)資料
| 型號： | MB3885 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 1-channel DC/DC Converter IC with Synchronous Rectifier |
| 中文描述： | 1通道DC / DC變換器的同步整流集成電路 |
| 文件頁數(shù)： | 15/29頁 |
| 文件大小： | 239K |
| 代理商： | MB3885 |
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MB3885
15
I
SETTING THE TIMER LATCH SHORT CIRCUIT PROTECTOR TIME CONSTANT
The error Amp. output level constantly compares operation with the short circuit protection comparator as the
reference voltage.
When the DC/DC comparator load conditions are stable, the short circuit protection comparator output is at “H”
level, transistor Q1 is on, and the CSCP terminal (pin 3) is held at input standby voltage
(V
STB
:
=
50 mV) .
If load conditions change rapidly, such as during a load short, causing output voltage to drop, the short circuit
protection comparator output goes to “L” level. This causes the transistor Q1 to shut off, charging the short circuit
protection capacitor Cscp (connected to the CSCP terminal) at 1
μ
A.
Short detection time
tscp (s) : 0.68
×
Cscp (
μ
F)
When the capacitor Cscp is charted to the threshold voltage (V
TH
:
=
0.68 V) a latch is set, turning the external
FET off (setting the idle interval to 100
%
) . At this time the latch input is closed and the CSCP terminal is held
at the input latch voltage (V
I
:
=
50 mV) .
+
+
13
7
8
6
15
FB
CS
C
S
INE
Error
Amp.
1.25 V
Q2
OUT1
Drive
Drive
OUT2
+
3
C
SCP
SCP Comp.
2.1 V
10
μ
A
1
μ
A
CSCP
Q1
Q4
S
R
Latch
bias
UVLO
<
Timer Latch Short Circuit Protection Circuit
>
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