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参数资料
| 型号： | NCP1027ATXGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/30页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL NCP1027 10W STANDBY |
| 设计资源： | NCP1027ATXGEVB Schematic NCP1027ATXGEVB Test Procedure NCP1027ATXGEVB Bill of Materials |
| 标准包装： | 1 |
| 主要目的： | AC/DC，主面 |
| 输出及类型： | 1，非隔离 |
| 功率 - 输出： | 10W |
| 输出电压： | 5V |
| 电流 - 输出： | 2A |
| 输入电压： | 85 ~ 265VAC |
| 稳压器拓扑结构： | 回扫 |
| 频率 - 开关： | 65kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1027 |
| 其它名称： | NCP1027ATXGEVB-ND NCP1027ATXGEVBOS |
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NCP1027
The bridge power dissipation is 330 2 /3.018 Meg =
36 mW in nominal high-line operation. Figure 30b
simulation result confirms our calculations.
Figure 31 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 31. 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, hence the
auto-recovery OVP on pin 1 would not satisfy the precision
requirements. 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
17
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