参数资料
| 型号： | FSQ100 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/12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 |
Application Tips
1. Methods of Reducing Audible Noise
Switching mode power converters have electronic and
magnetic components that generate audible noise when
the operating frequency is in the range of 20~20,000Hz.
Even though they operate above 20kHz, they can make
noise, depending on the load condition. Designers can
employ several methods to reduce noise.
Glue or Varnish
The most common method involves using glue or
varnish to tighten magnetic components. The motion of
core, bobbin and coil, and the chattering or
magnetostriction of core can cause the transformer to
produce audible noise. The use of rigid glue and varnish
helps reduce the transformer noise, but can crack the
core. This is because sudden changes in the ambient
temperature cause the core and the glue to expand or
shrink in a different ratio.
Ceramic Capacitor
Using a film capacitor instead of a ceramic capacitor as
a snubber capacitor is another noise-reduction solution.
Some dielectric materials show a piezoelectric effect,
depending on the electric field intensity. Hence, a
snubber capacitor becomes one of the most significant
sources of audible noise. It is possible to use a Zener
clamp circuit instead of an RCD snubber for higher
efficiency as and lower audible noise.
Figure 22.
Equal Loudness Curves
Adjusting Sound Frequency
Moving the fundamental frequency of noise out of
2~4kHz range is the third method. Generally, humans
Figure 23.
Typical Feedback Network of FPS?
are more sensitive to noise in the range of 2~4kHz.
When the fundamental frequency of noise is located in
this range, the noise is perceived as louder, although
the noise intensity level is identical (refer to Figure 22
Equal Loudness Curves).
When FPS acts in burst mode and the burst operation is
suspected to be a source of noise, this method may be
helpful. If the frequency of burst-mode operation lies in
the range of 2~4 kHz, adjusting the feedback loop can
shift the burst operation frequency. To reduce the burst
operation frequency, increase a feedback gain capacitor
(C F ), opto-coupler supply resistor (R D ), and feedback
capacitor (C B ); and decrease a feedback gain resistor
(R F ), as shown in Figure 23.
? 2007 Fairchild Semiconductor Corporation
FSQ100 Rev. 1.0.2
10
2. Reference Materials
AN-4147 — Design Guidelines for RCD Snubber of
www.fairchildsemi.com
相关PDF资料 |
PDF描述 |
|---|---|
| FSQ110 | IC SWIT PWM GREEN CM OVP 8DIP |
| FSQ211L | IC SWIT PWM GREEN UVLO HV 8SOP |
| FSQ311L | IC SWITCH FPS LOW EMI HE 8-LSOP |
| FSQ321LX | IC SWIT PWM GREEN OVP UVLO 8LSOP |
| FSQ500L | IC SWIT PWM GREEN UVLO SOT223 |
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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