STR3A455

Off-Line PWM Controllers with Integrated Power MOSFET STR3A400 Series Data Sheet Description The STR3A400 series are power ICs for switching power supplies, incorporating a MOSFET and a current mode PWM controller IC. The low standby power is accomplished by the automatic switching between the PWM operation in normal operation and the burst-oscillation under light load conditions. The product achieves high cost-performance power supply systems with few external components. Features ● Low Thermal Resistance Package ● Improving circuit efficiency (Since the step drive control can keep VRM of secondary rectification diodes low, the circuit efficiency can be improved by low VF) ● Current Mode Type PWM Control ● Soft Start Function ● Automatic Standby Function No Load Power Consumption < 15mW ● Operation Mode Normal Operation -----------------------------PWM Mode Light Load Operation ------------------------ Green-Mode Standby ---------------------------- Burst Oscillation Mode ● Random Switching Function ● Slope Compensation Function ● Leading Edge Blanking Function ● Bias Assist Function ● Protections Two Types of Overcurrent Protection (OCP): Pulse-by-Pulse, built-in compensation circuit to minimize OCP point variation on AC input voltage Overload Protection (OLP): Auto-restart Overvoltage Protection (OVP): Latched shutdown or auto-restart Thermal Shutdown (TSD): Latched shutdown or auto-restart with hysteresis Typical Application VAC BR1 C1 C4 C5 8 7 6 5 D/ST D/ST ...