STR5A451D

For Non-Isolated Off-Line PWM Controllers with Integrated Power MOSFET STR5A450D Series Data Sheet Description The STR5A450D Series is power ICs for switching power supplies, incorporating a MOSFET and a current mode PWM controller IC for non-isolated Buck converter and Inverting converter topologies. The operation mode is automatically changed, in response to load, to the fixed switching frequency, to the switching frequency control, and to the burst oscillation mode. Thus the power efficiency is improved. The product achieves high cost-performance power supply systems with few external components. Features ● Buck converter ● Inverting converter ● Current mode type PWM control ● Automatically changed operation mode in response to load conditions Fixed switching frequency mode, 60 kHz (typ.) Green mode, 23 kHz (typ.) to 60 kHz (typ.) Burst oscillation mode ● Built-in Startup Function reducing power consumption, and shortening the startup time ● Built-in Error Amplifier ● Random Switching Function ● Leading Edge Blanking Function ● Soft Start Function ● Protections Overcurrent Protection (OCP): adjustabe by an external current detection resistor, including OCP input compensation function Overload Protection (OLP): Auto-restart Overvoltage Protection (OVP): Auto-restart Thermal Shutdown with hysteresis (TSD): Auto-restart Typical Application (Buck Convertor) VAC STR5A450D D/ST 5 D/ST 6 D/ST 7 VCC GND FB 4 C4 3 C2 2 D/ST 8 S/OCP 1 U1 ROCP C1 D1 R1 C3 R2 R3 L1 D...