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參數(shù)資料
| 型號(hào)： | FSCQ |
| 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(kāi)關(guān)（FPS） |
| 文件頁(yè)數(shù)： | 13/44頁(yè) |
| 文件大?。?/td> | 1204K |
| 代理商： | FSCQ |
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FSCQ-SERIES
13
Functional Description
Startup
: Figure 4 shows the typical startup circuit and
the
transformer auxiliary winding for
the
FSCQ-Series.
Before
the
FSCQ-Series begins switching, it consumes only
startup current (typically 25uA)
.
T
he current supplied from
the AC line charges the external capacitor (C
a1
) that is
connected to the Vcc pin. When Vcc reaches the start voltage
of 15V (V
START
),
the
FSCQ-Series begins switching, and its
current consumption increases to I
OP
. Then, the FSCQ-
Series continues its normal switching operation and the
power required for the FSCQ-Series is supplied from the
transformer auxiliary winding, unless Vcc drops below the
stop voltage of 9V (V
STOP
). To guarantee the stable operation
of the control IC, Vcc has under voltage lockout (UVLO)
with 6V hysteresis. Figure 5 shows the relationship between
the
operating supply current of
the FSCQ-Series and the
supply voltage (Vcc).
1.
Figure 4. Startup circuit
Figure 5. Relationship Between Operating Supply Current
and Vcc Voltage
The minimum average of the current supplied from the AC is
given by
where
V
ac
min
is the minimum input voltage, V
start
is the
FSCQ-Series start voltage (15V)
,
and R
str
is the startup
resistor. The startup resistor should be chosen so that I
sup
avg
is larger than the maximum startup current (50uA).
Once the resistor value is determined, the maximum loss in
the startup resistor is obtained as
where
V
ac
max
is the maximum input voltage. The startup
resistor should have properly-rated dissipation wattage.
2. Synchronization:
The FSCQ-Series employs a quasi-
resonant switching technique to minimize the switching noise
and loss. In this technique, a capacitor (Cr) is added between
the MOSFET drain and
the
source as shown in Figure 6. The
basic waveforms of the quasi-resonant converter are shown in
Figure 7. The external capacitor lowers the rising slope of the
drain voltage to reduce the EMI caused when the MOSFET
turns off.
To
minimize the MOSFET’s switching loss, the
MOSFET should be turned on when the drain voltage reaches
its minimum value as shown in Figure 7.
Figure 6. Synchronization Circuit
FSCQ-Series
1N4007
Rstr
Vcc
C
a1
Da
I
sup
AC line
min
- V
ac
(V
ac
max
)
C
DC
C
a2
Icc
Vcc
Vstop=9V
I
START
I
OP
Vstart=15V
Vz
Power Up
Power Down
I
OP
Value
FSCQ0565RT : 4mA (Typ.)
FSCQ0765RT : 4mA (Typ.)
FSCQ0965RT : 6mA (Typ.)
FSCQ1265RT : 6mA (Typ.)
FSCQ1465RT : 7mA (Typ.)
FSCQ1565RT : 7mA (Typ.)
FSCQ1565RP : 7mA (Typ.)
I
sup
avg
2 V
-----------------------------
min
V
--------------
–
str
---------
=
Loss
R
str
---------
V
--------------------------------------------------
max
(
)
2
V
2
+
2
2 2 V
V
-----------------------------------------------------
max
–
=
V
cc
C
a1
D
a
C
DC
C
a2
GND
Cr
Drain
Ids
R
cc
R
SY1
R
SY2
Sync
+
V
DC
-
Lm
Vo
C
SY
+
V
ds
-
V
co
D
SY
Np
Ns
Na
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FSCQ1465RT | Green Mode Fairchild Power Switch (FPS) |
| FSCQ1565RP | Green Mode Fairchild Power Switch (FPS) for Quasi-Resonant Switching Converter |
| FSCQ1565RPSYDTU | Green Mode Fairchild Power Switch (FPS) for Quasi-Resonant Switching Converter |
| FSCQ0965RTYDTU | Green Mode Fairchild Power Switch (FPS) |
| FSCQ1465RTYDTU | Green Mode Fairchild Power Switch (FPS) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FSCQ_06 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPS⑩) |
| FSCQ0565RT | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPS) |
| FSCQ0565RTYDTU | 功能描述:電源開(kāi)關(guān) IC - 配電 5A 650V QRC PwrSwtch RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)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 |
| FSCQ0765RT | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPS) |
| FSCQ0765RTYDTU | 功能描述:軟開(kāi)關(guān) PWM 控制器 7A/650V QRC Power Switch RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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