Product Summary

The 3706M is a high performance AC/DC power supply controller for battery charger and adapter applications. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies. Applications are (1)Adapters/Chargers for Cell/Cordless Phones, PDAs, MP3 and Other Portable Apparatus; (2)Standby and Auxiliary Power Supplies.

Parametrics

3706M absolute maximum ratings: (1)Supply Voltage VCC: -0.3 to 30 V; (2)Voltage at CS, BIAS, OUT, VDD, COMP to GND: -0.3 to 7 V; (3)FB input (Pin 5): -40 to 10 V; (4)Output Current at OUT: Internally limited A; (5)Power Dissipation at TA=25oC: 0.657 W; (6)Operating Junction Temperature: 150 ℃; (7)Storage Temperature: -65 to 150 ℃; (8)Lead Temperature (Soldering, 10s): 300 ℃; (9)Thermal Resistance Junction-to-Ambient: 190 ℃/W; (10)ESD (Machine Model): 200 V.

Features

3706M features: (1)Primary Side Control for Rectangular Constant Current and Constant Voltage Output; (2)Eliminates Opto-Coupler and Secondary CV/CC Control Circuitry; (3)Eliminates Control Loop Compensation Circuitry; (4)Flyback Topology in DCM Operation; (5)Random Frequency Modulation to Reduce System EMI; (6)Valley Turn on of External Power NPN Transistor; (7)Built-in Soft Start; (8)Open Circuit Protection; (9)Over Voltage Protection; (10)Short Circuit Protection.

Diagrams

3706M pin connection