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 effciency ? numerous kind of protect functions applications ? lcd tv/monitor main and standby smps ? note pc adapter specifcations ? startup current source 7ma, 1.6ma at vcc=0v, 30ua at off ? vcc voltage range 9 to 26v ? out pin peak current sink 500ma, source -250ma ? soft-start time 2.6ms ? is current limiter 1v0.1v, windings shorted protection 2v ? zcd ovp protection 7.2v ( latched) ? olp timer auto-recovery switching on/off is 0.2/1.4 sec (prepared in fa5571 series olp auto-recovery and latched) circuit block
2009-4 example of power supply confguration standby power and effciency (power supply specifcations: output power - 19v, rating - 5 a) comparison between fa5571 series models and conventional models conventional models fa5571 series (new models) item fa5531 fa5532 fa5541 fa5542 fa55771 fa5572 fa5573 FA5574 1 light-load operation frequency reduction intermittent operation intermittent operation frequency reduction 2 intermittent operation start fb voltage D 0.34v 0.4v D 3 frequency reduction start fb voltage 1.3v D D 1.15v 4 overload operation auto recovery timer latch auto recovery timer latch auto recovery timer latch auto recovery timer latch 5 reduced current at vh pin when vcc is shorted 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 6 ovp detection at zcd pin external latch function latched in 48us after pull-up external latch function latched in 48us after pull-up external latch function: latched in 57us after pull-up + latch is detected in 2.3us after turnoff 7 additional is pin short protection function n/a n/a 2.0v 8 vcc pin uvlo level 9.85v/9.1v 10.2v/9.0v 18v/8v 9 internal soft start 1ms (only at startup) 1ms (only at startup) 2.6ms (only at startup) 10 ovp detection at vcc pin 28v 28v n/a input ac voltage [vac] information in this catalog is subject to change without notice.
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