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