SBASAB6A March 2022 – July 2022 AMC23C12-Q1
PRODUCTION DATA
Fast overcurrent detection is a common requirement in DC/DC converter and motor-control applications, and can be implemented with an AMC23C12-Q1 isolated window comparator as shown in Figure 8-1.
The load current flowing through an external shunt resistor RSHUNT produces a voltage drop that is sensed by the AMC1300B-Q1 for control purposes. The same voltage is monitored by the AMC23C12-Q1 that is connected in parallel to the current-sensing amplifier and provides a fast sensing path for positive and negative fault-current detection. The overcurrent detection threshold is set by the external resistor R1 and the overcurrent event is signaled on the open-drain output OUT.
As depicted in Figure 8-1, the integrated low-dropout (LDO) regulator on the high-side allows direct connection of the VDD1 input to a commonly used floating gate-driver supply. Alternatively, the AMC23C12-Q1 can share a regulated supply with the AMC1300B-Q1. In that case, the VDD1 pin of the AMC23C12-Q1 connects directly to the VDD1 pin of the AMC1300B-Q1 and R4 is not needed. The fast response time and high common-mode transient immunity (CMTI) of the AMC23C12-Q1 ensure reliable and accurate operation even in high-noise environments.