MM1548

( DataSheet : www.DataSheet4U.com ) MITSUMI Secondary Control for Energy-Saving AC Adaptor MM1548 Secondary Control for Energy-Saving AC Adaptor Monolithic IC MM1548 Outline This IC is secondary control on AC adaptors that have energy-saving mode. The energy-saving mode function operates when charging is completed or when the set is unplugged, thus greatly reducing AC adaptor power consumption. When a set is connected, normal mode automatically starts and charging starts. Compared to the conventional MM1529, this IC is smaller and has fewer external components. Features 1. Automatic switching between energy-saving mode and normal mode 2. Current consumption (energy-saving mode) 60µA 3. Current consumption (normal mode) 1.5mA 4. Uses one photocoupler to control oscillator primary side. 5. One photocoupler is used to control rated voltage and rated current and switching between energy-saving and normal modes. Package SOT-26 Pin Assignment 1 1 2 3 SOT-26 6 5 4 2 3 OUT CNT VCC 4 5 6 PO1 GND CS www.DataSheet4U.com www.DataSheet4U.com MITSUMI Secondary Control for Energy-Saving AC Adaptor MM1548 Block Diagram Load detection resistor RLS PC1 Primary-side switching control transformer secondary side RL1 RLB PO1 VCC CNT OUT 4 Photocoupler-turn-off 3 2 1 COUT Voltage buffer Input/output difference control (VCC-OUT=200mV) Load detection(current) (115mV 200mV) 1.25V Reference voltage VCC=4.6V ROS1 VCC Load detection(voltage) (VCC=3.5V) 5k Over voltage detect...