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參數(shù)資料
| 型號： | NCP1215SNT1 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low Cost Variable OFF Time Switched Mode Power Supply Controller |
| 中文描述： | SWITCHING CONTROLLER, PDSO6 |
| 封裝： | SOT-23, SC-59, TSOP-6 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 148K |
| 代理商： | NCP1215SNT1 |
NCP1215
http://onsemi.com
13
Figure 24 shows CT voltage and also by Channel 2 the
switch’s drain voltage at light load conditions.
Figure 24. CT and Drain at Light Load
The waveform on the current sense pin at full load
conditions can be observed from Channel 3 in Figure 25.
Figure 25. CS Pin at Full Load Condition
Figure 26 demonstrates the reduction of the peak primary
current at light load conditions.
Figure 26. CS Pin at Light Load Condition
GateSource Resistor Design Guidelines
In some applications, there is a need to wire a resistor
between the MOSFET gate and source connections. This
can preclude an eventual MOSFET destruction if, in the
production stage, the converter is powered whilst the gate is
left unconnected. However, dealing with an extremely low
startup current implies a careful selection of the gatesource
resistance. With the NCP1215, the gatesource resistor must
be calculated to allow the growth of the V
CC
capacitor to
4.0 V in order to not interfere with the poweron sequence.
The following equation helps deriving Rgatesource,
accounting for the minimum rectified input voltage and the
startup resistor: Vin
min
x Rgatesource/(Rgatesource +
Rstartup)
4.0 V. If we take a Vin
min
of 100 VDC, a startup
resistor of 4.0 M , then Rgatesource equals 180 k as a
minimum normalized value.
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