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參數(shù)資料
| 型號(hào)： | FSL136HR |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.41 A SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | MS-001BA, DIP-8 |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 995K |
| 代理商： | FSL136HR |
2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSL136HR Rev. 1.0.0
11
FSL136HR
—
Green
Mode
Fairchild
Power
Switch
(FPS)
OSP detects VFB and SenseFET turn-on time. When the
VFB is higher than 1.6V and the SenseFET turn-on time
is lower than 1.2s, the FPS recognizes this condition
as an abnormal error and shuts down PWM switching
until VCC reaches VSTART again. An abnormal condition
output is shown in Figure 20.
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 20ms, 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.
Soft-start helps prevent transformer saturation and
reduce the stress on the secondary diode.
Figure 21. Internal Soft-Start
Burst Operation
To minimize power dissipation in standby mode, the
FPS enters burst mode. As the load decreases, the
feedback voltage decreases. As shown in Figure 22, the
device automatically enters burst mode when the
feedback
voltage
drops
below VBURH. Switching
continues
until
the
feedback
voltage
drops
below VBURL. At this point, switching stops and the
output voltages drop at a rate dependent on standby
current load. This causes the feedback voltage to rise.
Once it passes VBURH, 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.
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 400A. For example, FSL136HR has a typical
SenseFET peak current limit (ILIM) of 2.15A. ILIM can be
adjusted to 1.5A by inserting Rx between the IPK pin and
the ground. The value of the Rx can be estimated by the
following equations:
XkΩ
:
6kΩ
1.5A
:
2.15A
(1)
6kΩ
||
Rx
X
(2)
where X is the resistance of the parallel network.
Figure 23. Peak Current Limit Adjustment
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FSL136HRL | 功能描述:電源開關(guān) IC - 配電 Green Mode Fairchild Power Switch (FPS) RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 開啟電阻（最大值）: 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓: 電源電流（最大值）: 最大工作溫度: 安裝風(fēng)格: 封裝 / 箱體: |
| FSL136HRLX | 制造商:Fairchild Semiconductor Corporation 功能描述:Power Switch 3A T/R 制造商:Fairchild Semiconductor Corporation 功能描述:FPS FOR LOW POWER - Tape and Reel 制造商:Fairchild Semiconductor Corporation 功能描述:IC FPS SWITCH PWM/SENSEFET 8LSOP 制造商:Fairchild Semiconductor Corporation 功能描述:Power Switch ICs - Power Distribution Green Mode Fairchild Power Switch (FPS) 制造商:Fairchild Semiconductor Corporation 功能描述:TAPE REEL / Green Mode Fairchild Power Switch |
| FSL136MR | 功能描述:電流型 PWM 控制器 FPS FOR LOW POWER RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| FSL136MRT | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPSa?￠) |
| FSL136MRTWDTU | 功能描述:電源開關(guān) IC - 配電 4Ohms 1.35mA 50W RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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