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35#
发表于 2011-5-21 23:14:39
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来自: 广东东莞 来自 广东东莞
回复 jzfs 的帖子
不管是什么状态,在此电路中,进去的信号就只有LAN_ON信号作为EN开启。没有别的信号,,除了信号就2个电压,VCC=5V一直没变,变的只是VIN,用适配器时19V,用电池12V。
还有MOS管上管D极电压同VIN。
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查过ISL6227的VIN脚,好像是一个多功能脚。英文如下。
VIN (Pin 14)
This pin has multiple functions. When connected to battery voltage, it provides battery voltage to the oscillator as a feed-forward for the rejection of input voltage variation. The ramp of the PWM comparator is proportional to the voltage on this pin (see Table 1 and Table 2 for details). While the DDR pin is high in the DDR application, and when the VIN pin voltage is greater than 4.2 volt when connecting to a battery, it commands 90° out-of-phase channel synchronization, with the second channel lagging the first channel, to reduce inter-channel interference. When the pin voltage is less than 4.2V, this pin commands in-phase channel synchronization.
用google翻得不好,还是看得不太懂。 |
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