- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375932 > FSDM311 (FAIRCHILD SEMICONDUCTOR CORP) Green Mode Fairchild Power Switch (FPS) PDF資料下載
參數(shù)資料
| 型號(hào)： | FSDM311 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Green Mode Fairchild Power Switch (FPS) |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 73 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | MS-001BA, DIP-8 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 377K |
| 代理商： | FSDM311 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)當(dāng)前第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
FSDM311
11
Figure 7. Protection block
4.1 Over Load Protection (OLP) :
Overload is a load cur-
rent that exceeds a pre-set level due to an abnormal situation.
If this occurs, the protection circuit should be triggered to
protect the SMPS. It is possible that a short term load tran-
sient can occur under normal operation. If this occurs the
system should not shut down. In order to avoid false shut-
downs, the over load protection circuit is designed to trigger
after a delay. Therefore the device can discriminate between
transient overloads and true fault conditions. The device is
pulse-by-pulse current limited and therefore, for a given
input voltage, the maximum input power is limited. If the
load tries to draw more than this, the output voltage will drop
below its set value. This reduces the opto-coupler LED cur-
rent which in turn will reduce the photo-transistor current.
Therefore, the 400uA current source will charge the feed-
back pin capacitor, Cfb, and the feedback voltage, Vfb, will
increase. The input to the feedback comparator is clamped at
around 3V. Therefore, once Vfb reaches 3V, the device is
switching at maximum power. At this point the 400uA cur-
rent source is blocked and the 5uA source continues to
charge Cfb. Once Vfb reaches 4.5V, switching stops. There-
fore the shutdown delay time is set by the time required to
charge Cfb from 3V to 4.5V with 5uA as shown in Fig. 5.
4.2 Thermal Shutdown (TSD) :
The Sense FET and the
control IC are assembled in one package. This makes it easy
for the control IC to detect the temperature of the Sense FET.
When the temperature exceeds approximately 145
°
C, ther-
mal shutdown is activated.
Figure 8. Over load protection delay
5. Soft Start
: The FPS has an internal soft start circuit that
increases the drain current limit together with the MOSFET
current slowly after it starts up. The soft start time is typical
1
5msec as shown in figure 9.
It progressively increases dur-
ing the start-up phase. The pulse width to the power switch-
ing devices is progressively increased to establish the correct
working conditions for transformers, inductors, and capaci-
tors. The voltage on the output capacitors is progressively
increased with the intention of smoothly establishing the
required output voltage. Consequently it prevents the trans-
former’s saturation and the secondary diodes’s stress.
Figure 9. Internal Soft Start
OSC
4
Vfb
S
R
Q
GATE
DRIVER
FSDM311
OLP, TSD
Protection Block
5uA
400uA
RESET
Vth 4.5V
OLP
+
-
TSD
S
R
Q
A/R
Cfb
3V
R
Vfb
t
3V
OLP
4.5V
t1
t3
t1<<t2, t3
t1 = -1/RC
Χ
ln( 1-v(t1)/R )
t2 = C
Χ
[v(t1+t2)-v(t1)]
v(t1)=3V
Χ
Idelay
Χ
Χ
Χ
t2
FPS Switching Area
Idelay (5uA) charges Cfb
IC Reset
2mS
7steps
0.31A
0.55A
t
Drain current
[A]
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FSDM311L | Green Mode Fairchild Power Switch (FPS) |
| FSES0765RGWDTU | Green Mode Fairchild Power Switch (FPS) for Green Mode Fairchild Power Switch (FPSTM) for |
| FSES0765RG | Green Mode Fairchild Power Switch (FPS) for Green Mode Fairchild Power Switch (FPSTM) for |
| FSF055D1 | 25A, 60V, 0.020 Ohm, Rad Hard, SEGR Resistant, N-Channel Power MOSFETs |
| FSF055D | 25A, 60V, 0.020 Ohm, Rad Hard, SEGR Resistant, N-Channel Power MOSFETs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FSDM311_06 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPS TM) |
| FSDM311A | 功能描述:電流型 PWM 控制器 0.575A 650V SMPS 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 |
| FSDM311L | 功能描述:電源開關(guān) IC - 配電 SMPS PS for PC TV and Mont Aux Power 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 |
| FSDM3-125M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Delay Line |
| FSDM3-15M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Delay Line |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。