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Registered Member #59643
Joined: Sun Apr 24 2016, 05:50AM
Location:
Posts: 4
i am trying to duplicate loneoceans sstc then i am going to moified to drsstc then my own bigger drsstc
so now i am following this : same interrupter used 555 timer to replicate feedback about 80kHZ .
but the when i scope the driver output
scope 1 pin7 -ground scope 2 pin5 - ground
the both signals are non-inverted . so i suspected the INA , INB are different . scoped both , both signals are the same . but the output form the driver supposed to be non-inverted and inverted . what am i doing wrong here ?
Registered Member #59643
Joined: Sun Apr 24 2016, 05:50AM
Location:
Posts: 4
using 12v power supply
pin1 is getting the output form the interrupter both pin 1 and 8 are high and low at the same time . same with pin 4&2 getting the output of the 555 timer aprrox 82khz .
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
first I would check that the IC is marked 27425, sometimes suppliers mess-up.
disconnect the primary & 1 uF load on the outputs and check operation, if still in-phase then the 27425 is faulty.
I saw the note on the circuit diagram indicating 5 V output required from the interrupter for testing disconnect the diode to the uvlo circuit as it may be confusing things.
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stupid question , please help
