FA5571 FUJI | Alldatasheet
Document overview
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Technical content
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 ・OUT pin peak current sink 500mA, source -250mA ・Soft-start time 2.6ms ・IS current limiter 1V±0.1V, 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
■ Example of power supply configuration ■ Standby power and efficiency (power supply specifications: 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
― 0.34V 0.4V ―
3 Frequency reduction
1.3V ― ― 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
(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
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
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
Input AC Voltage [Vac] Information in this catalog is subject to change without notice.