参数资料
| 型号： | FSQ110 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC SWIT PWM GREEN CM OVP 8DIP |
| 标准包装： | 50 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 92kHz ~ 108kHz |
| 输入电压： | 9 V ~ 20 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 17W |
| 工作温度： | -25°C ~ 85°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
| 其它名称： | FSQ110-ND FSQ110FS |
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 140 ° C, thermal
shutdown is activated.
4.3 Over-Voltage Protection (OVP): In the event of a
malfunction in the secondary-side feedback circuit or an
open-feedback loop caused by a soldering defect, the
current through the opto-coupler transistor becomes
almost zero (see Figure 14). V FB climbs up in a similar
manner to the overload situation, forcing the preset
burst-mode when the feedback voltage drops below
V BURH (typically 600mV). Switching continues until the
feedback voltage drops below V BURL (typically 400mV).
At this point, switching stops and the output voltage
starts to drop at a rate dependent on the standby current
load. This causes the feedback voltage to rise. Once it
passes V BURH , switching resumes. The feedback
voltage then falls and the process is repeated. Burst-
mode operation alternately enables and disables
switching of the SenseFET and reduces switching loss in
standby mode.
maximum current to be supplied to the SMPS until the
overload protection is activated. Because excess energy
is provided to the output, the output voltage may exceed
the rated voltage before the overload protection is
activated, resulting in the breakdown of the devices in
the secondary side. To prevent this situation, an Over-
Voltage Protection (OVP) circuit is employed. In general,
V CC is proportional to the output voltage and the FPS
V FB
V BURH
V BURL
Current
Burst Operation
Burst Operation
Normal
Operation
uses V CC instead of directly monitoring the output
voltage. If V CC exceeds 19V, the OVP circuit is activated,
Waveform
Switching OFF
Switching
OFF
resulting in termination of the switching operation. To
avoid undesired activation of OVP during normal
operation, V CC should be designed to be below 19V.
5. Soft-Start: The FPS has an internal soft-start circuit
that slowly increases the SenseFET current after start-
up, as shown in Figure 16. The typical soft-start time is
10ms, where progressive increments of the SenseFET
current are allowed during the start-up phase. The pulse
width to the power switching device is progressively
increased to establish the correct working conditions for
transformers, inductors, and capacitors. The voltage on
the output capacitors is progressively increased to
FSQ110 Rev.00
Figure 17. Burst Operation Function
7. Adjusting Peak Current Limit: As shown in Figure
18, a combined 2.8k Ω internal resistance is connected to
the non-inverting lead on the PWM comparator. An
external resistance of Rx on the current limit pin forms a
parallel resistance with the 2.8k Ω when the internal
diodes are biased by the main current source of 900μA.
smoothly establish the required output voltage. This also
helps prevent transformer saturation and reduces the
stress on the secondary diode during startup.
V FB
V CC
I DELAY
5 μ A
I FB
V CC
900 μ A
2k ?
PWM
Comparator
3
5V
#6,7,8
DRAIN
I PK
0.8k ?
4
SenseFET
Current
Sense
#1
GND
Rx
FSQ0110 Rev. 1.00
I LIM
R sense
Figure 18. Peak Current Limit Adjustment
FSQ110 Rev. 1.00
Figure 16. Soft-Start Function
For example, FSQ110 has a typical SenseFET peak
current limit (I LIM ) of 0.7A. I LIM can be adjusted to 0.6A
by inserting Rx between the I PK pin and the ground. The
value of the Rx is estimated by the following equation:
6. Burst Operation: To minimize power dissipation in
0.7A: 0.6A = 2.8k Ω : Xk Ω ,
(1)
standby mode, the FPS enters burst-mode operation.
Feedback voltage decreases as the load decreases, as
shown in Figure 17, and the device automatically enters
? 2007 Fairchild Semiconductor Corporation
FSQ110 Rev. 1.0.0
9
X = Rx || 2.8k Ω
where X is the resistance of the parallel network.
www.fairchildsemi.com
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相关代理商/技术参数 |
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| FSQ210M | 功能描述:电源开关 IC - POE / LAN FPS RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| FSQ210MX | 制造商:Fairchild Semiconductor Corporation 功能描述:FPS |
| FSQ211 | 功能描述:电源开关 IC - 配电 SMPS Power Switch RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSQ211L | 功能描述:电源开关 IC - 配电 SMPS Power Switch RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSQ2W | 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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