參數(shù)資料
型號(hào)： FSCQ0565RTYDTU
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Green Mode Fairchild Power Switch (FPS)
中文描述： 11.2 A SWITCHING REGULATOR, 22 kHz SWITCHING FREQ-MAX, PZFM5
封裝： TO-220F, 5 PIN
文件頁(yè)數(shù)： 14/44頁(yè)
文件大?。?/td> 1204K
代理商： FSCQ0565RTYDTU
FSCQ-SERIES
14
Figure 7. Quasi-resonant Operation Waveforms
The minimum drain voltage is indirectly detected by
monitoring the Vcc winding voltage as shown in Figure 6
and 8.
Choose
voltage dividers, R
SY1
and R
SY2,
so that the
peak voltage of the sync signal (V
sypk
) is lower than the
OVP voltage (12V)
to
avoid triggering OVP in normal
operation. It is typical to set V
sypk
to be lower than OVP
voltage by 3-4 V.
T
o detect the optimum time to turn on
MOSFET, the sync capacitor (C
SY
) should be determined so
that T
R
is the same with T
Q as shown in Figure 8
. The T
R
and
T
Q
are given as, respectively
where L
m
is the primary side inductance of the transformer,
and
N
s
and N
a
are the number of turns for the output
winding and Vcc winding, respectively
,
V
Fo
and V
Fa
are the
diode forward voltage drops of the output winding and Vcc
winding, respectively, and C
eo
is the sum of the output
capacitance of the MOSFET and the external capacitor, Cr.
Figure 8. Normal Quasi-Resonant Operation Waveforms
Figure 9. Extended Quasi-Resonant Operation
In general, the QRC has a limitation in a wide load range
application, since the switching frequency increases as the
output load decreases, resulting in a severe switching loss in
the light load condition.
To
overcome
this limitation, the
FSCQ-Series employs an extended quasi-resonant switching
operation. Figure 9 shows the mode change between normal
and extended quasi-resonant operations. In the normal quasi-
resonant operation, the FSCQ-Series enters into the extended
quasi-resonant operation when the switching frequency
exceeds 90kHz as the load
reduces
. To reduce the switching
frequency, the MOSFET is turned on when the drain voltage
reaches the second minimum level, as shown in Figure 10.
V
DC
V
RO
V
RO
I
pk
I
ds
V
d
s
V
gs
MOSFET
Off
MOSFET
On
T
R
R
SY2
C
SY
V
2.6
--------
R
+
R
SY1
R
SY2
----------------------------------
ln
=
T
Q
π
L
m
C
eo
=
V
co
N
---------------------+
V
N
s
)
V
Fa
–
=
Vsync
Vds
MOSFET Gate
2V
RO
Vrh (4.6V)
Vrf (2.6V)
ON
T
Q
T
R
ON
V
sypk
Output power
Switching
frequency
Normal QR operation
Extended QR operation
90kHz
45kHz
相關(guān)PDF資料
PDF描述
FSCQ1565RT Green Mode Fairchild Power Switch (FPS)
FSCQ Green Mode Fairchild Power Switch (FPS)
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FSCQ0765RT 制造商:FAIRCHILD 制造商全稱(chēng):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
FSCQ0965RT 制造商:FAIRCHILD 制造商全稱(chēng):Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPS TM)
FSCQ0965RTYDTU 功能描述:軟開(kāi)關(guān) PWM 控制器 POWER_CONVERSION 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
FSCQ1265RT 制造商:FAIRCHILD 制造商全稱(chēng):Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPS TM)
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*