FA55771

Power Electronics FA5571 series Low Standby Power Quasi-Resonant Controller ■ Features ・Internal 500V high voltage startup current source ・Realized less than 1W input at 0.7W load by intermitting ・Quasi-resonant operation, low noise and high efficiency ・Numerous kind of protect functions ■ Applications ・LCD TV/Monitor Main and Standby SMPS ・Note PC Adapter ■ Specifications ・Startup current source 7mA, 1.6mA at VCC=0V, 30uA at off ・VCC voltage range 9 to 26V ・Soft-start time 2.6ms ・OUT pin peak current sink 500mA, source -250mA ・IS current limiter 1V±0.1V, Windings shorted protection 2V ・ZCD OVP protection 7.2V ( Latched) O ・ LP timer auto-recovery switching on/off is 0.2/1.4 sec ■ Circuit block (Prepared in FA5571 series OLP auto-recovery and latched) ■ Example of power supply configuration ■ Standby power and efficiency (power supply specifications: output power - 19V, rating - 5 A) Input AC Voltage [Vac] ■ Comparison between FA5571 series models and conventional models Conventional models Item 1 Light-load operation 2 Intermittent operation start FB voltage 3 Frequency reduction start FB voltage 4 Overload operation 5 Reduced current at VH pin when VCC is shorted FA5531 ― 1.3V Auto recovery Timer latch FA5532 FA5541 0.34V ― Auto recovery Timer latch FA5542 FA55771 0.4V ― Auto recovery Timer latch Frequency reduction Intermittent operation FA5571 series (new models) FA5572 FA5573 ― 1.15V Auto recovery Timer latch FA5574 Intermittent operation Frequency reduction 8mA when VCC is shorted (current-limiting resistor is required 7.6mA when VCC is shorted (current-limiting resistor is required) Limited VH current when VCC voltage is low IVH＝1.6mA at VCC＝0V External latch function: Latched in 57us after pull-up + Latch is detected in 2.3us after turnoff 2.0V 18V/8V 2.6ms (only at startup) N/A 6 OVP detection at ZCD External latch function External latch function pin Latched in 48us after pull-up Latched in 48us after pull-up 7 Additional IS pin short protection function 8 VCC pin UVLO level 9 Internal soft start 10 OVP detection at VCC pin N/A 9.85V/9.1V 1ms (only at startup) 28V N/A 10.2V/9.0V 1ms (only at startup) 28V Information in this catalog is subject to change without notice. 2009-4