参数资料
型号: FSQ500L
厂商: Fairchild Semiconductor
文件页数: 10/12页
文件大小: 0K
描述: IC SWIT PWM GREEN UVLO SOT223
标准包装: 1
系列: FPS™
输出隔离: 隔离
频率范围: 120kHz ~ 140kHz
输入电压: 5.5 V ~ 10 V
输出电压: 700V
功率(瓦特): 3W
工作温度: -40°C ~ 85°C
封装/外壳: TO-261-4,TO-261AA
供应商设备封装: SOT-223-3
包装: 标准包装
其它名称: FSQ500LFSDKR
5. Burst Operation : To minimize power dissipation in
standby mode, the FPS enters burst-mode operation.
During the burst mode operation, I FB(Burst) decreases half
of I FB(Normal) . As the load decreases, the feedback
voltage decreases. As shown in Figure 21, the device
automatically enters burst mode when the feedback
voltage drops be low V BURL (750mV). At this point,
switching stops and the output voltages start to drop at a
rate dependent on standby current load. This causes the
feedback voltage to rise. Once it passes V BURH (800mV),
switching resumes. The feedback voltage then falls and
the process repeats. Burst mode alternately enables
Vo
Vo set
V FB
0.80V
0.75V
I DS
and disables switching of the power senseFET, reducing
switching loss in standby mode.
V DS
time
t 1
Switching
disabled
t 2
t 3
Switching
disabled
t 4
Figure 21. Burst-Mode Operation
? 2008 Fairchild Semiconductor Corporation
FSQ500L ? Rev. 1.0.3
10
www.fairchildsemi.com
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