US 12,340,824 B2
Circuit for controlling a resistive circuit
Marco Mazzini, Pavia (IT); Marco Ciuffolini, Pieve Emanuele (IT); Enrico Mammei, Vittuone (IT); and Paolo Pulici, Lainate (IT)
Assigned to STMicroelectronics S.r.l., MB (IT)
Filed by STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed on Feb. 5, 2024, as Appl. No. 18/432,776.
Application 18/432,776 is a continuation of application No. 18/146,034, filed on Dec. 23, 2022, granted, now 11,922,979.
Claims priority of application No. 102022000001877 (IT), filed on Feb. 3, 2022.
Prior Publication US 2024/0177732 A1, May 30, 2024
Int. Cl. G11B 5/00 (2006.01); G05F 1/56 (2006.01); G11B 5/012 (2006.01); H05B 3/22 (2006.01)
CPC G11B 5/012 (2013.01) [G05F 1/56 (2013.01); H05B 3/22 (2013.01); G11B 2005/0021 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A circuit, comprising:
a heater drive node configured to be coupled to a resistive heater element to provide a drive current thereto, wherein power dissipated in the resistive heater element varies over time as a function of an intensity of the drive current provided to the resistive heater element;
control circuitry configured to vary the intensity of the drive current of the resistive heater element, wherein the control circuitry comprises:
driver circuitry configured to produce an analog target voltage based on an analog drive current intensity signal; and
an output circuit coupled to the driver circuitry to receive therefrom the analog target voltage, the output circuit configured to produce the drive current provided to the resistive heater element based on the analog target voltage, wherein the output circuit is configured to control the power dissipated in the resistive heater element independently of a resistance value of the resistive heater element, and the output circuit comprises an amplifier and a feedback capacitor coupled between an output of the amplifier and the heater drive node.