Fuji FA5572 Low standby power quasi-resonant controller Datasheet

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
・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)
Input AC Voltage [Vac]
■ Comparison between FA5571 series models and conventional models
Conventional models
Item
1 Light-load operation
FA5531
FA5532
FA5571 series (new models)
FA5541
FA5542
FA55771
FA5572
FA5573
FA5574
Frequency reduction
Intermittent operation
Intermittent operation
Frequency reduction
2 Intermittent operation
start FB voltage
―
0.34V
0.4V
―
3 Frequency reduction
start FB voltage
1.3V
―
―
1.15V
4 Overload operation
5 Reduced current at VH
pin when VCC is shorted
Auto recovery
Timer latch
8mA when VCC is shorted
(current-limiting resistor is
required
Auto recovery
Timer latch
7.6mA when VCC is shorted
(current-limiting resistor is
required)
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
Auto recovery
Timer latch
Auto recovery
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
N/A
N/A
2.0V
9.85V/9.1V
10.2V/9.0V
18V/8V
1ms (only at startup)
1ms (only at startup)
2.6ms (only at startup)
28V
28V
N/A
Information in this catalog is subject to change without notice.
Timer latch
2009-4
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