US 12,075,536 B2
LED array driver system
Maria Francesca Seminara, Catania (IT); and Salvatore Rosario Musumeci, Fiumefreddo di Sic (IT)
Assigned to STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed by STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed on Dec. 7, 2022, as Appl. No. 18/062,929.
Application 18/062,929 is a continuation of application No. 17/313,480, filed on May 6, 2021, granted, now 11,546,980.
Claims priority of application No. 102020000013561 (IT), filed on Jun. 8, 2020.
Prior Publication US 2023/0135666 A1, May 4, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H05B 45/397 (2020.01); H05B 45/14 (2020.01)
CPC H05B 45/397 (2020.01) [H05B 45/14 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A slew rate control unit comprising:
a first input comprising a non-inverting input of a comparator, wherein the first input is configured to receive a reference voltage;
a second input comprising an inverting input of the comparator, wherein the second input is configured to receive a feedback signal from a conduction terminal of a power transistor;
a first output configured to provide an enable signal to a control terminal of a first transmission gate coupled between an operational amplifier and a control terminal of the power transistor;
a second output configured to provide a charge/discharge current to a control terminal of the power transistor;
wherein the slew rate control unit is configured to:
control a slew rate of a driving current through the power transistor;
selectively charge an equivalent capacitance at the control terminal of the power transistor with a charging current; and
selectively discharge the equivalent capacitance with a discharging current, the charging current and the discharging current depending at least in part on a target value of the driving current.