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Hi Yogesha,
The OPA2237 and BSS123 FET form a DC current source. Assuming the negative supply (V-) of the OPA2237 is connected to GND, as connected with the 2.5V reference and 4V supply, the sink current is approximately is roughly, VSET / RSET = ~103mV / 549Ω = 186μA as shown on the simplified simulation below. The current source works as long as VADJ voltage (drain of the FET transistor) has a voltage above VSET.
The PTN78060WAS datasheet recommends placing a resistor between Vo adjust control pin 4 and GND to adjust the output voltage; and explains the relation of the external resistor value against the expected output voltage on equation (1) and Table 3. However, the datasheet does not seem to provide information on how to calculate the VADJ current relation to output voltage.
I am part of the Precision Amplifiers team; hence, I will refer this question to the experts on the Power Management Applications team, since I do not have detailed information about the PTN78060WAS.
Thank you and Regards,
Luis
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