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有人用过HT7660吗

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发表于 2013-8-21 14:18 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式

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有用过HT7660的吗,我要用正5V的电压产生一个正负5V的方波,接了个HT7660产生负电压,可一接上负载,-5V的电压就上升到0V了,振荡电路电流最大才10MA,是不是我电路接错了。请哪位高人指点一下。

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发表于 2013-8-21 23:51 | 只看该作者
本帖最后由 超級狗 于 2013-8-22 08:26 编辑
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& v6 y6 ^) c* w9 W+ W Intersil ICL7660A 上面講的︰
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Do’s And Don’ts
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  • Do not exceed maximum supply voltages.
  • Do not connect LV terminal to GROUND for supply voltages greater than 3.5V.
  • Do not short circuit the output to V+ supply for supply voltages above 5.5V for extended periods, however, transient conditions including start-up are okay.
  • When using polarized capacitors, the + terminal of C1 must be connected to pin 2 of the ICL7660 and  CL7660A and the + terminal of C2 must be connected to GROUND.
  • If the voltage supply driving the ICL7660 and ICL7660A has a large source impedance (25Ω - 30Ω), then a 2.2μF capacitor from pin 8 to ground may be required to limit rate of rise of input voltage to less than 2V/μs.
  • User should insure that the output (pin 5) does not go more positive than GND (pin 3). Device latch up will occur under these conditions. A 1N914 or similar diode placed in parallel with C2 will prevent the device from latching up under these conditions. (Anode pin 5, Cathode pin 3).; {/ k2 [0 R  }5 o6 S6 w/ X9 H

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試試看吧!/ K& f5 o8 n9 H: @: z5 x; v
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HT7660
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Floating this pin enables the voltage regulator. Connect this pin to VSS (Ground) to bypass voltage regulator and improve low voltage operation.2 q% g+ ^# ^* h; A2 ~! s" R

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ICL7660A.pdf

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HT7660.pdf

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