Description

The ADP2450 integrates one boost shunt controller with powerdetection, one high efficiency buck regulator, four low offset,low power consumption programmable gain amplifiers (PGAs),one low offset operation amplifier, a fast analog trip circuit, andan actuator driver. The ADP2450 is targeted for low voltagecircuit breakers, such as the molded case circuit breaker(MCCB), and current transformer (CT) powered supplyapplications.The boost output voltage can be up to 36 V and integrates apower detection circuit that prevents the circuit from powerhiccups. The power detection threshold is programmable withresistors.The buck regulator operates over a wide input voltage range of4.5 V to 36 V, and the output voltage can be adjusted down to0.6 V. The buck regulator provides output currents of up to500 mA. The buck regulator works in pulse-width modulation(PWM) mode with a fixed 1.2 MHz switching frequency,providing low output ripple voltage to the system.The output voltage of the buck regulator is monitored by thesupervisory circuit. When the output voltage is below themonitoring threshold, 88% of VFB2 (FB2 regulation voltage), thereset signal is pulled low and can be used to reset themicroprocessor. The monitoring supervisory circuit makes thesystem more reliable.The ADP2450 integrates four low offset, low power consumptionamplifiers. With the programmable gain features, the ADP2450provides accuracy measurement over a wide current input rangebased on the CT turn ratio.A low offset operation amplifier is integrated in the ADP2450for leakage current detection.The ADP2450 also integrates an analog trip circuit, whichprovides fast trip response and enhances system reliability.Additional protection includes buck overcurrent protection(OCP) and system thermal shutdown (TSD).The ADP2450 operates over the ?40?C to +125?C junctiontemperature range and is available either in a 32-lead LFCSP ora 48-lead LQFP packages.Applications Low voltage circuit breaker CT powered supply

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Part number: ADP2450ASTZ-3-EVBZ

More details from Analog Devices Inc.