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Part Number: NE555
At present, when using ne555 to drive MOS behind the small power LED, using switching power supply, ne555 works normally, put on the battery (lithium battery / carbonic acid) battery voltage test 13.5v. This time has been powered and the battery voltage will be down to 1v, off Turn on the battery voltage measurement, or 13,5v, disconnect the battery on the foot, the battery voltage is normal, please help confirm what is the reason Is ne555 CMOS or ttl? When reading 5v input, it is written as ttl level. Please help confirm whether the wide voltage input is cmos. Is the internal integrated transistor just ttl level? Both power modes are normal using tlc555
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In reply to Paul Goedeke:
Can NE555 TTL level support wide voltage input? Normal TTL level supports 5V.
The main problem is that when the battery is powered, the battery voltage will be lowered. Please confirm it.
The following is the schematic diagram. Please check it.
In reply to user4173409:
Regards,Ronald MichallickLinear Applications
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In reply to Ron Michallick:
When the battery voltage is 13.5 V, NE555 will produce a large surge current-30A, resulting in battery protection, so there is no output, Why is this happening?The battery voltage measured separately is 13.5 v.Replacement of TLC 555. All clear.
When we replace TLC555, there is no current pulse.
After power on, the current pulse is too large, resulting in battery protection, no voltage output
Thank you for your answer. The problem has been solved.
However, it was found that the first PWM waveform of the NE555 is very wide and the width of the waveform behind it is not the same. Is it related to the capacitance added to the 5th pin?Is the CMOS and TTL foot 5 matched capacitors different? We're using a 10NF capacitor.
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