Smart Meter Block Diagram

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SmartMeter

AC-DC Converter High Voltage Step-Down Converter Low Noise LDO (Low Dropout Regulator) Voltage Sensor / Current Sensor High Voltage Step-Down Converter High Voltage Step-Down Converter Step-Down Converter Transducer Power Line SW (Relay Drive)

(AC-DC Converter)

products Features
NJW4790 Quasi-Resonance RCC Control IC

(High Voltage Step-Down Converter)

products Features
NJW4155 Current Mode Control Internal 1.8A MOSFET Switching Regulator IC for Buck Converter
NJW4177 Internal 2A MOSFET Switching Regulator IC for Synchronous Buck Converter

(Low Noise LDO (Low Dropout Regulator))

products Features
NJM11100 Adjustable Low Dropout Regulator with Reverse Current Protection
NJM12884 LDO with Reverse Current Protection / Soft Start / Discharge Function
NJM12888 LDO with Reverse Current Protection / Soft Start / Discharge Function

(Voltage Sensor / Current Sensor) JFET Op-Amp.

products Features
NJM8512 Precision, JFET Input Operational Amplifier

(Temperature Sensor/Heliograph Sensor) Operational Amplifier

products Features
NJU7077 Precision, Low Noise, Rail-to-Rail Output, Excellent EMI Immunity, CMOS Operational Amplifiers
NJU7078 Precision, Low Noise, Rail-to-Rail Output, Excellent EMI Immunity, CMOS Operational Amplifiers
NJU77002 1.5V, 0.23µA/ch, Ultra-Low Power, Excellent EMI Immunity, Rail-to-Rail Input/Output, CMOS Operational Amplifiers
NJU77552 1.7MHz, 50µA/ch, Excellent EMI Immunity, Rail-to-Rail Input/Output, Operational Amplifier

(PLC (Power Line Communication))

products Features
NJM45001 Analog Front-End IC for Power Line Communication

(High Voltage Step-Down Converter)

products Features
Ricoh Electronic Devices Co., Ltd.
DC/DC Switching Regulators
R1245 Series 1.2A 30V Input PWM Step-down DC/DC Converter

(Step-Down Converter)

products Features
NJW4122 2A Synchronous Buck Converter for POL

(AFE) Transducer

products Features
NJU9103 Analog Front End with High Gain PGA

(Op-Amp.) Transducer

products Features
NJU77002 1.5V, 0.23µA/ch, Ultra-Low Power, Excellent EMI Immunity, Rail-to-Rail Input/Output, CMOS Operational Amplifiers
NJU77552 1.7MHz, 50µA/ch, Excellent EMI Immunity, Rail-to-Rail Input/Output, Operational Amplifier

(Power Line SW (Relay Drive))

products Features
NJU7386 Low Voltage Operation H-Bridge Driver

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