Part Number:UC1823A
Hi,
In our system, we use UC1823A as a voltage mode controlled PWM IC. As you know, NI (non-inverting) pin is connected to a reference voltage level. This voltage reference is adjustable between 0V to 5V. However, we observed that UC1823A does not create PWM output when NI pin is below than 650 mV. It seems there is a threshold voltage for NI pin. Is this observation is correct ? If correct, how can we operate pur system when reference voltage level is 500 mV ?