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| 型号： | FSDL321 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC SWIT PWM GREEN CM OVP HV 8DIP |
| 产品变化通告： | Passivation Layer Change 07/Dec/2007 |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 频率范围： | 45kHz ~ 55kHz |
| 输入电压： | 8 V ~ 20 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 17W |
| 工作温度： | 25°C ~ 140°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 其它名称： | FSDL321_NL FSDL321_NL-ND |
FSDH321, FSDL321
5V
D R A IN
Burst Operation
Burst Operation
Feedback
Normal Operation
S W IT C H
O FF
I_ o v e r
GND
Rsense
0.5V
0.35V
Current
waveform
Figure 8. Soft Start Function
Switching OFF
Switching OFF
Figure 10. Circuit for Burst Operation
6. Burst operation : In order to minimize power dissipation
in standby mode, the FPS TM enters burst mode operation.
7. Frequency Modulation : EMI reduction can be accom-
plished by modulating the switching frequency of a switched
+
power supply. Frequency modulation can reduce EMI by
0.35V/0.5V
0.5V
-
Vcc
spreading the energy over a wider frequency range than the
band width measured by the EMI test equipment. The
amount of EMI reduction is directly related to the depth of
Vcc
Vcc
I B_PEAK
the reference frequency. As can be seen in Figure 11, the fre-
quency changes from 97KHz to 100KHz (from 48.5KHz to
FB
3
I delay
I FB
2.5R
R
Normal
Burst
PWM
MOSFET
Current
51.5KHz for FSDL321)in 4mS for the FSDH321. Frequency
modulation allows the use of a cost effective inductor instead
of an AC input mode choke to satisfy the requirements of
world wide EMI limits.
Internal
Figure 9. Circuit for Burst operation
Oscillator
103kHz
As the load decreases, the feedback voltage decreases. As
shown in figure 10, the device automatically enters burst
mode when the feedback voltage drops below
V BURH (500mV). Switching still continues but the current
limit is set to a fixed limit internally to minimize flux density
in the transformer. The fixed current limit is larger than that
Drain to
Source
voltage
defined by Vfb = V BURH and therefore, Vfb is driven down
further. Switching continues until the feedback voltage drops
below V BURL (350mV). At this point switching stops and
the output voltages start to drop at a rate dependent on the
standby current load. This causes the feedback voltage to
rise. Once it passes V BURH (500mV) switching resumes.
The feedback voltage then falls and the process repeats.
Burst mode operation alternately enables and disables
Drain to
Turn-on
Vds
Waveform
97kHz
100kHz
103kHz
Turn-off
6kHz
switching of the power Sense FET thereby reducing switch-
ing loss in Standby mode.
12
Figure 11. Frequency Modulation Waveform for FSDH321
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSDL321L | 功能描述:电源开关 IC - 配电 FPS for DVDP/STB 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 |
| FSDL321L_Q | 功能描述:电源开关 IC - 配电 FPS for DVDP/STB 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 |
| FSDLC01G-S | 制造商:AXIOMTEK 制造商全称:AXIOMTEK 功能描述:Capacity: 128MB to 32GB |
| FSDLC128-S | 制造商:AXIOMTEK 制造商全称:AXIOMTEK 功能描述:Capacity: 128MB to 32GB |
| FSDLC16G-S | 制造商:AXIOMTEK 制造商全称:AXIOMTEK 功能描述:Capacity: 128MB to 32GB |
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