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Part Number: LM2903-Q1
My customer is designing LM2903-Q1 as below schematic,
When they define PHASEU_OC_4V5 = 4.5V as below waveform#1, when the Input signal arrive 3.9V will make the output change from High to Low.
When they define PHASEU_OC_4V5 = 2.83V as below waveform#2, when the Input signal arrive 2.7V will make the output change from High to Low.
May I know the reason why the comparator input not reach the ref level in pin3 but it will trigger to change the status from high to low?
Could you please help to explain on it?
Waveform#1_yellow=input, Blue=PHASEU_OC_4V5, Red=output
Waveform#2_yellow=input, Blue=PHASEU_OC_4V5=2.83V , Red=output
you violate the common mode input voltage range:
Make the following changes:
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As Kai explained - you are violating the input voltage range. It will get worse at cold.
Also please see the following application note for a full explanation, section 2.2:
TI Comparators (CMPS) Applications Group
In reply to Paul Grohe:
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