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本帖最后由 超級狗 于 2013-8-22 08:26 编辑 + @+ ^9 g) l5 f7 p6 n
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Intersil ICL7660A 上面講的︰ K/ L5 Y; L/ P
: N' O: M9 y# j: E3 t6 n! s6 lDo’s And Don’ts1 N- w* B( m& P- c) N$ o5 C, m
- 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).& t& n1 ~7 L, n) @5 S
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試試看吧！
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LV Pin︰* j3 B$ i. W5 R, q! J
Floating this pin enables the voltage regulator. Connect this pin to VSS (Ground) to bypass voltage regulator and improve low voltage operation.1 ]8 r# ~; Y* `2 }
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发表于 2013-8-21 14:18
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反对！
发表于 2013-8-21 23:51
