參數(shù)資料
型號(hào)： FSDM07652R
廠商： Fairchild Semiconductor Corporation
英文描述： Green Mode Fairchild Power Switch (FPS)
中文描述： 綠色模式飛兆半導(dǎo)體功率開關(guān)（FPS）
文件頁(yè)數(shù)： 12/20頁(yè)
文件大?。?/td> 262K
代理商： FSDM07652R
FSDM0565R
12
Figure 6. Auto restart operation
3.1 Over Load Protection (OLP) :
Overload is defined as
the load current exceeding a pre-set level due to an
unexpected event. In this situation, the protection circuit
should be activated in order to protect the SMPS. However,
even when the SMPS is in the normal operation, the over
load protection circuit can be activated during the load
transition. In order to avoid this undesired operation, the over
load protection circuit is designed to be activated after a
specified time to determine whether it is a transient situation
or an overload situation. Because of the pulse-by-pulse
current limit capability, the maximum peak current through
the Sense FET is limited, and therefore the maximum input
power is restricted with a given input voltage. If the output
consumes beyond this maximum power, the output voltage
(Vo) decreases below the set voltage. This reduces the
current through the opto-coupler LED, which also reduces
the opto-coupler transistor current, thus increasing the
feedback voltage (Vfb). If Vfb exceeds 2.5V, D1 is blocked
and the 3.5uA current source starts to charge C
B
slowly up to
Vcc. In this condition, Vfb continues increasing until it
reaches 6V, when the switching operation is terminated as
shown in figure 7. The delay time for shutdown is the time
required to charge C
B
from 2.5V to 6.0V with 3.5uA. In
general, a 10 ~ 50 ms delay time is typical for most
applications.
Figure 7. Over load protection
3.2 Abnormal Over Current Protection (AOCP)
: Even
though the FPS
TM
has OLP (Over Load Protection) and
current mode PWM feedback, these are not enough to protect
the FPS
TM
when a secondary side diode short or a
transformer pin short occurs. The FPS
TM
has an internal
AOCP (Abnormal Over Current Protection) circuit as shown
in figure 8. When the gate turn-on signal is applied to the
power Sense FET, the AOCP block is enabled and monitors
the current through the sensing resistor. The voltage across
the resistor is then compared with a preset AOCP level. If the
sensing resistor voltage is greater than the AOCP level for
longer than 300ns, the reset signal is applied to the latch,
resulting in the shutdown of SMPS.
Figure 8. AOCP block
3.3 Over voltage Protection (OVP)
: If the secondary side
feedback circuit were to malfunction or a solder defect
caused an open in the feedback path, the current through the
opto-coupler transistor becomes almost zero. Then, Vfb
climbs up in a similar manner to the over load situation,
forcing the preset maximum current to be supplied to the
SMPS until the over load protection is activated. Because
more energy than required is provided to the output, the
Fault
situation
8V
12V
Vcc
Vds
t
Fault
occurs
Fault
removed
Normal
operation
Normal
operation
Power
on
V
FB
t
2.5V
6.0V
Over load protection
T
1
2
*
=
Cfb
*
(6.0-2.5)
/
I
delay
T
1
T
2
2
S
Q
Q
R
OSC
R
2.5R
GND
Gate
driver
LEB
PWM
+
-
Vaocp
AOCP
R
sense
相關(guān)PDF資料
PDF描述
FSDM0565R Time-Delay Relay; Contacts:SPST-NO; Time Range:0.2 sec. to 20 sec.; Timing Function:Interval One Shot; Contact Carry Current:2A; Relay Terminals:Quick Connect; Supply Voltage:120VAC
FSDM0565RWDTU Green Mode Fairchild Power Switch (FPS)
FSDM07652RWDTU Green Mode Fairchild Power Switch (FPS)
FSDM101 Green Mode Fairchild Power Switch (FPSTM)
FSDM1265RBWDTU Green Mode Fairchild Power Switch (FPS)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FSDM07652RB 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPS)
FSDM07652RBWDTU 功能描述:電源開關(guān) IC - 配電 SMPS Power Switch Built-in Soft Start RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5
FSDM07652RE 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch
FSDM07652REWDTU 功能描述:電流型 PWM 控制器 SMPS with Built-in Soft-Start RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
FSDM07652RWDTU 功能描述:電源開關(guān) IC - 配電 FPS FOR LCD RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5
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