US 10,890,605 B1
Load detection circuit and load driver having load detection circuit
Ji Buem Chun, Suwon-si (KR)
Assigned to Samsung Electro-Mechanics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electro-Mechanics Co., Ltd., Suwon-si (KR)
Filed on Apr. 20, 2020, as Appl. No. 16/852,650.
Claims priority of application No. 10-2019-0174160 (KR), filed on Dec. 24, 2019.
Int. Cl. G01R 19/165 (2006.01); H03K 17/687 (2006.01); G05F 3/26 (2006.01)
CPC G01R 19/16552 (2013.01) [G05F 3/262 (2013.01); H03K 17/6871 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A circuit with load driver detection, the circuit comprising:
a reference voltage generation circuit configured to generate a reference voltage based on a reference current;
a voltage selection circuit configured to select one of a first detection voltage based on a first driving current through a load and a second detection voltage based on a second driving current flowing through the load; and
a detection circuit configured to generate a detection signal, the detection circuit being configured to compare a detection voltage selected by the voltage selection circuit with the reference voltage,
wherein the reference voltage is set by the reference voltage generation circuit to be higher than the detection voltage in response to the load being indicated as being in a normal state based on the detection signal, and the reference voltage is set by the reference voltage circuit to be lower than the detection voltage in response to the load being indicated as being in a shorted state based on the detection signal,
wherein the reference voltage generation circuit comprises:
a current source configured to generate the reference current;
a current mirror circuit configured to mirror the reference current as a first current; and
a voltage generation circuit configured to receive the first current from the current mirror circuit and generate the reference voltage based on the first current.