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| 型号： | NCP1028LEDGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/29页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP1028LEDG |
| 设计资源： | NCP1028LEDGEVB BOM CP1028LEDGEVB Gerber Files NCP1028LED EVB Schematic |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 720mA |
| 输出及类型： | 1，隔离 |
| 输出电压： | 18V |
| 输入电压： | 90 ~ 265VAC |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1028 |
| 其它名称： | NCP1028LEDGEVBOS |
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NCP1028
The bridge power dissipation is 330 2 /3.018 Meg =
36 mW in nominal high-line operation. Figure 29b
simulation result confirms our calculations.
Figure 30 describes signal variations during a brown-out
when V CC reaches V CC(ON) , ensuring a clean startup
sequence. As in fault mode conditions, the startup source
is activated on and off and self-supplies the controller in a
Dynamic Self-Supply (DSS) mode.
condition. Please note that output pulses only reappear
Figure 30. Signal Evolution During a Brown-Out Condition
Depending on input surge tests, it might be necessary to
wire a filtering capacitor between BO and GND (close to
the circuit) to avoid adversely triggering the internal latch
(unless this is a wanted feature) when the pulse train
appears.
Latchoff Protection
There are some situations where the converter shall be
fully turned-off and stay latched. This can happen in the
presence of a secondary overvoltage (the feedback loop is
drifting) or when an overtemperature is detected.
Secondary monitoring is usually implemented when the
coupling between auxiliary and power windings does not
lead to a precise primary detection. Due to the addition of
a comparator on the BO pin, a simple external circuit can
lift up this pin above VLATCH and permanently disable
pulses. The V CC needs to be cycled down below 3.5 V
typically to reset the controller.
http://onsemi.com
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