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| 型号： | FSCQ0965RTYDTU |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 17/36页 |
| 文件大小： | 0K |
| 描述： | IC FPS PWM SWITCH 650V TO-220F-5 |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 频率范围： | 18kHz ~ 22kHz |
| 输入电压： | 9 V ~ 20 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 130W |
| 工作温度： | 25°C ~ 150°C |
| 封装/外壳： | TO-220-5 全封装（成形引线） |
| 供应商设备封装： | TO-220F-5L（成形） |
| 包装： | 管件 |
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KA431 through D 1 . Before V o2 drops to V o2
, the
5. Soft Start: The FSCQ series has an internal soft-start
c ircuit that increases PWM comparator’s inverting input
voltage together with the SenseFET current slowly after
it starts up. The typical soft start time is 20 ms. The
When the picture ON signal is disabled, Q 1 is turned off
and R 3 and D z are connected to the reference pin of
stby
pulse
width to the power switching device is
voltage on the reference pin of KA431 is higher than
is no switching, V o2 decreases until it reaches V o2
. As
V o2 reaches V o2
, the current through the opto LED
? 2 . 5 ? ? ? 1
? R ? R 2 ?
?
V O 1
?
progressively increased to establish the correct working
conditions for transformers, inductors, and capacitors.
Increasing the pulse width to the power switching device
also helps prevent transformer saturation and reduces
the stress on the secondary diode during startup. For a
fast build up of the output voltage, an offset is
introduced in the soft-start reference current.
6. Burst Operation: To minimize the power
consumption in the standby mode, the FSCQ series
employs burst operation. Once FSCQ series enters
burst mode, FSCQ series allows all output voltages and
shows the typical feedback circuit for C-TV applications.
In normal operation, the picture on signal is applied and
the transistor Q 1 is turned on, which decouples R 3 , D Z
and D 1 from the feedback network. Therefore, only V O1
is regulated by the feedback circuit in normal operation
and determined by R 1 and R 2 as:
NORM
(6)
? R 2 ?
In standby mode, the picture ON signal is disabled and
the transistor Q 1 is turned off, which couples R 3 , D Z , and
2.5 V, which increases the current through the opto
LED. This pulls down the feedback voltage (V FB ) of
FSCQ series and forces FSCQ series to stop switching.
If the switching is disabled longer than 1.4 ms, FSCQ
series enters into burst operation and the operating
current is reduced from I OP to 0.25 mA (I OB ). Since there
stby
stby
decreases allowing the feedback voltage to rise. When
the feedback voltage reaches 0.4 V, FSCQ series
resumes switching with a predetermined peak drain
current of 0.9 A. After burst switching for 1.4 ms, FSCQ
series stops switching and checks the feedback voltage.
If the feedback voltage is below 0.4 V, FSCQ series
stops switching until the feedback voltage increases to
0.4 V. If the feedback voltage is above 0.4 V, FSCQ
series goes back to the normal operation. The output
voltage drop circuit can be implemented alternatively, as
shown in Figure 37. In the circuit, the FSCQ series goes
into burst mode, when picture off signal is applied to Q 1 .
Then, V o2 is determined by the Zener diode breakdown
voltage. Assuming that the forward voltage drop of opto
LED is 1 V, the approximate value of V o2 in standby
mode is given by:
D 1 to the reference pin of KA431. Then, V O2 is
determined by the Zener diode breakdown voltage.
V O 2
STBY
? V Z ? 1
(8)
Assuming that the forward voltage drop of D 1 is 0.7V,
V O2 in standby mode is approximately given by:
V O2
V O 2
STBY
? V Z ? 0 . 7 ? 2 . 5
(7)
Linear
Micom
V O2
Regulator
V O1 (B+)
Linear
Regulator
Micom
R bias
R D
V O1 (B+)
R D
Dz
R bias
R 1
R 3
C F
R F
R 1
C F
R F
D 1
KA431
C
A
R
R 2
Q1
Picture ON
C
KA431
A
R
R 2
Dz
Figure 36.
Typical Feedback Circuit to Drop
Output Voltage in Standby Mode
Q 1
Figure 37.
Picture OFF
Feedback Circuit to Drop Output
Voltage in Standby Mode
? 2006 Fairchild Semiconductor Corporation
FSQ-Series ? Rev. 1.1.3
17
www.fairchildsemi.com
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