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參數資料
| 型號： | FSDM07652RB |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Green Mode Fairchild Power Switch (FPS) |
| 中文描述： | 綠色模式飛兆半導體功率開關（FPS） |
| 文件頁數： | 12/20頁 |
| 文件大?。?/td> | 594K |
| 代理商： | FSDM07652RB |
FSDM0565RB
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 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
output voltage may exceed the rated voltage before the over
load protection is activated, resulting in the breakdown of the
devices in the secondary side. In order to prevent this
situation, an over voltage protection (OVP) circuit is
employed. In general, Vcc is proportional to the output
voltage and the FSDM0565RB uses Vcc instead of directly
monitoring the output voltage. If V
CC
exceeds 19V, an OVP
circuit is activated resulting in the termination of the
switching operation. In order to avoid undesired activation of
OVP during normal operation, Vcc should be designed to be
below 19V.
3.3 Thermal Shutdown (TSD) :
The Sense FET and the
control IC are built in one package. This makes it easy for
the control IC to detect the heat generation from the Sense
FET. When the temperature exceeds approximately 150
°
C,
the thermal shutdown is activated.
4. Soft Start
: The FSDM0565RB has an internal soft start
circuit that increases PWM comparator inverting input
voltage together with the Sense FET current slowly after it
starts up. The typical soft start time is 10msec, The pulse
width to the power switching device is progressively
increased to establish the correct working conditions for
transformers, inductors, and capacitors. The voltage on the
output capacitors is progressively increased with the
intention of smoothly establishing the required output
voltage. It also helps to prevent transformer saturation and
reduce the stress on the secondary diode during startup.
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
12
= Cfb*(6.0-2.5)/I
delay
T
1
T
2
相關PDF資料 |
PDF描述 |
|---|---|
| FSDM07652R | Green Mode Fairchild Power Switch (FPS) |
| 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) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| FSDM07652RBWDTU | 功能描述:電源開關 IC - 配電 SMPS Power Switch Built-in Soft Start RoHS:否 制造商:Exar 輸出端數量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關閉時間（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 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| FSDM07652RWDTU | 功能描述:電源開關 IC - 配電 FPS FOR LCD RoHS:否 制造商:Exar 輸出端數量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關閉時間（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 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| FSDM07652RYDTU | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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