参数资料
| 型号： | FSQ100 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC SWIT PWM GREEN OVP HV 8DIP |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 频率范围： | 61 ~ 73kHz |
| 输入电压： | 8 V ~ 20 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 8W |
| 工作温度： | 25°C ~ 145°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
4.1 Overload Protection (OLP) : Overload is defined as
the load current exceeding a pre-set level due to an
unexpected event. In this situation, the protection circuit
0.55A
Drain current
should be activated to protect the SMPS. However,
even when the SMPS is operating normally, the over
load protection (OLP) circuit can be activated during the
load transition. To avoid this undesired operation, the
OLP circuit is designed to be activated after a specified
time to determine whether it is a transient situation or a
true overload situation. If the output consumes more
0.31A
2.14ms
7steps
than the maximum power determined by I LIM , the output
voltage (V O ) decreases below its rating voltage. This
reduces the current through the opto-coupler LED,
which also reduces the opto-coupler transistor current,
Figure 19.
Internal Soft-Start
t
thus increasing the feedback voltage (V FB ). If V FB
exceeds 3V, the feedback input diode is blocked and the
5μA current source (I DELAY ) starts to charge C FB slowly
up to V CC . In this condition, V FB increases until it reaches
4.5V, when the switching operation is terminated, as
shown in Figure 18. The shutdown delay time is the time
required to charge C FB from 3V to 4.5V with a 5μA
current source.
6. Burst Operation : To minimize the power dissipation
in standby mode, the FSQ100 enters burst-mode
operation. As the load decreases, the feedback voltage
decreases. The device automatically enters burst mode
when the feedback voltage drops below V BURL (0.55V).
At this point, switching stops and the output voltages
start to drop. This causes the feedback voltage to rise.
Once is passes V BURH (0.70V), switching starts again.
The feedback voltage falls and the process repeats.
V FB
Overload Protection
Burst-mode operation alternately enables and disables
switching of the power MOSFET to reduce the switching
loss in standby mode.
4.5V
OSC
3V
t 12 = Cfb×(V(t 2 )-V(t 1 )) / I DELAY
V fb
4
5μA
400μA
S
R
Q
GATE
DRIVER
on /off
t 1
t 2
t
0.70V
/0.55V
Burst Operation Block
t 12 = C fb
V (t 2 ) ? V (t 1 )
I DELAY
; I DELAY = 5 μ A , V ( t 1 ) = 3 V , V ( t 2 ) = 4 . 5 V
Figure 20.
Burst Operation Block
Figure 18.
Overload Protection (OLP)
V O
V O set
4.2 Thermal Shutdown (TSD) : The SenseFET and the
control IC are integrated, making it easier for the control
IC to detect the temperature of the SenseFET. When
the temperature exceeds approximately 145 ? C, thermal
shutdown is activated.
5. Soft-Start : The FPS has an internal soft-start circuit
that slowly increases the feedback voltage, together with
the SenseFET current, right after it starts. The typical
soft-start time is 15ms, as shown in Figure 19, where
progressive increment of the SenseFET current is
allowed during the startup phase. Soft-start circuit
progressively increases current limits to establish proper
working conditions for transformers, inductors,
capacitors, and switching devices. It also helps to
prevent transformer saturation and reduces the stress
V FB
0.70V
0.55V
I ds
V ds
on the secondary diode.
? 2007 Fairchild Semiconductor Corporation
Figure 21.
t
Burst Operation Function
www.fairchildsemi.com
FSQ100 Rev. 1.0.2
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSQ100_11 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPSa?￠) |
| FSQ10A04 | 制造商:NIEC 制造商全称:Nihon Inter Electronics Corporation 功能描述:Schottky Barrier Diode |
| FSQ10A04B | 制造商:NIEC 制造商全称:Nihon Inter Electronics Corporation 功能描述:Schottky Barrier Diode |
| FSQ10A06B | 制造商:NIEC 制造商全称:Nihon Inter Electronics Corporation 功能描述:Schottky Barrier Diode |
| FSQ10W | 制造商:RFE 制造商全称:RFE international 功能描述:FUSIBLE RESISTORS FM, FKN, & FSQ Series: Fusible |
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