Data communication for galvanic isolated DC-DC converter on fully integrated architecture with coreless transformer

A device comprising a DC-DC converter, wherein the DC-DC converter comprises:

• a transformer having a primary coil and a secondary coil;
• a primary-side control circuit comprising:
• an oscillator configured to drive the transformer in response to assertion of a pulse width modulation (PWM) signal to thereby transmit power from the primary coil to the secondary coil, and to cease driving the transformer in response to deassertion of the PWM signal;
• a receiver demodulator circuit configured to receive and demodulate a feedback signal sent from the secondary coil to the primary coil by comparing an instantaneous value of an envelope indicative of voltages at the primary coil to an average value of the envelope to thereby produce a reset signal;
• and
• a PWM circuit configured to assert the PWM signal in response to a set signal and deassert the PWM signal in response to assertion of the reset signal;
• and
• a secondary-side control circuit configured to:
• rectify the power received at the secondary coil to generate an output voltage;
• assert an intermediate feedback signal if a feedback voltage indicative of the output voltage is greater than or equal to a reference voltage;
• and
• connect a capacitance between the secondary coil and ground in response to assertion of the intermediate feedback signal to thereby modulate and send the feedback signal from the secondary-side control circuit to the primary-side.