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参数资料
| 型号： | FSL106MR |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC PWM/SEMSEFET SMPS 0.5A 8-DIP |
| 标准包装： | 50 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 90kHz ~ 110kHz |
| 输入电压： | 9 V ~ 26 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 13W |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
Output-Short Protection (OSP)
If the output is shorted, steep current with extremely
high di/dt can flow through the SenseFET during the
LEB time. Such a steep current brings high-voltage
stress on the drain of SenseFET when turned off. To
protect the device from such an abnormal condition,
OSP is included. It is comprised of detecting V FB and
SenseFET turn-on time. When the V FB is higher than
1.6V and the SenseFET turn-on time is lower than 1.0μs,
the FPS recognizes this condition as an abnormal error
and shuts down PWM switching until V CC reaches
V START again. An abnormal condition output is shown in
Figure 20.
feedback voltage decreases. As shown in Figure 22, the
device automatically enters burst mode when the
feedback voltage drops below V BURH . Switching
continues until the feedback voltage drops below V BURL .
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 , switching resumes. The feedback voltage
then falls and the process repeats. Burst mode
alternately enables and disables switching of the
SenseFET and reduces switching loss in standby mode.
MOSFET
Drain
Current
Rectifier
Diode
Current
Turn-off delay
I LIM
V FB
V OUT
D
Minimum
turn-on time
1.6us
output short occurs
I OUT
Figure 20. Output Short Waveforms (OSP)
Soft-Start
The FPS has an internal soft-start circuit that slowly
increases the feedback voltage, together with the
SenseFET current, after it starts. The typical soft-start
time is 15ms, as shown in Figure 21, where progressive
increments of the SenseFET current are allowed during
the startup 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 with the intention
of smoothly establishing the required output voltage. It
also helps to prevent transformer saturation and reduce
the stress on the secondary diode.
Figure 22. Burst-Mode Operation
Adjusting Peak Current Limit
As shown in Figure 23, a combined 6k ? 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 6k ?
when the internal diodes are biased by the main current
source of 400μA. For example, FSL106MR has a typical
SenseFET peak current limit (I LIM ) of 0.55A. I LIM can be
adjusted to 0.4A by inserting Rx between the I PK pin and
the ground. The value of the Rx can be estimated by the
following equations:
0.55A : 0.4A = 6kΩ : XkΩ
X = Rx || 6kΩ
(1)
(2)
where X represents the resistance of the parallel
network.
Figure 21. Internal Soft-Start
Burst Operation
To minimize power dissipation in standby mode, the
FPS? enters burst mode. As the load decreases, the
? 2010 Fairchild Semiconductor Corporation
FSL106MR ? Rev. 1.0.3
11
Figure 23. Peak Current Limit Adjustment
www.fairchildsemi.com
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