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參數(shù)資料
| 型號(hào)： | FSCQ1565RPVDTU |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Green Mode Fairchild Power Switch (FPS⑩) |
| 中文描述： | 33.2 A SWITCHING REGULATOR, 22 kHz SWITCHING FREQ-MAX, PZFM5 |
| 封裝： | TO-3PF, 7PIN |
| 文件頁數(shù)： | 15/45頁 |
| 文件大?。?/td> | 1379K |
| 代理商： | FSCQ1565RPVDTU |
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www.fairchildsemi.com
FSCQ-Series Rev. 1.1.2
F
Figure 7. Quasi-Resonant Operation
Waveforms
The minimum drain voltage is indirectly detected by mon-
itoring 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 3–4V. To detect the optimum time to turn on
MOSFET, the sync capacitor (C
SY
) should be deter-
mined 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 trans-
former, and N
s
and N
a
are the number of turns for the
output winding and V
CC
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 switch-
ing loss in the light load condition. To overcome this limi-
tation, 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
V
RO
V
DC
I
pk
V
RO
V
ds
I
ds
V
gs
MOSFET
Off
MOSFET
On
T
R
R
SY2
C
SY
In
V
co
2.6
--------
R
+
R
SY1
R
SY2
----------------------------------
=
T
Q
π
L
m
C
eo
=
V
co
N
-----------------------------------------
V
s
V
+
(
)
V
Fa
–
=
V
sync
V
ds
MOSFET Gate
2V
RO
Vrh (4.6V)
Vrf (2.6V)
ON
T
Q
T
R
ON
V
sypk
Switching
frequency
90kHz
Extended QR operation
Normal QR operation
Output power
45kHz
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