參數(shù)資料
型號(hào)： NCP1203P60G
廠商： ON SEMICONDUCTOR
元件分類(lèi)： 穩(wěn)壓器
英文描述： PWM Current−Mode Controller for Universal Off−Line Supplies Featuring Standby and Short Circuit Protection
中文描述： 0.25 A SWITCHING CONTROLLER, 73 kHz SWITCHING FREQ-MAX, PDIP8
封裝： LEAD FREE, PLASTIC, DIP-8
文件頁(yè)數(shù)： 12/15頁(yè)
文件大?。?/td> 217K
代理商： NCP1203P60G
NCP1203
http://onsemi.com
12
Figure 21. A negative spike takes place on the Bulk capacitor at the switchoff sequence
Simple and inexpensive cures exist to prevent from
internal parasitic SCR activation. One of them consists in
inserting a resistor in series with the highvoltage pin to
keep the negative current to the lowest when the bulk
becomes negative (Figure 22). Please note that the negative
spike is clamped to –2 x Vf due to the diode bridge. Also, the
power dissipation of this resistor is extremely small since it
only heats up during the startup sequence.
Another option (Figure 23) consists in wiring a diode from
V
CC
to the bulk capacitor to force V
CC
to reach UVLOlow
sooner and thus stops the switching activity before the bulk
capacitor gets deeply discharged. For security reasons, two
diodes can be connected in series.
Figure 22. A simple resistor in series avoids any
latchup in the controller
CV
CC
D3
1N4007
8
7
6
5
1
2
3
4
+
Cbulk
+
CV
CC
Rbulk
> 4.7 k
8
7
6
5
1
2
3
4
+
Cbulk
+
Figure 23. or a diode forces V
CC
to reach
UVLOlow sooner
相關(guān)PDF資料
PDF描述
NCP1203P100 PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit
NCP1203D100R2 PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit
NCP1203D100R2G PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit
NCP1203 PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit
NCP1203D60R2 PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit
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