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부품번호 FA5553 기능
기능 PWM Control Power Supply IC
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FA5553 데이터시트, 핀배열, 회로
FA5553/5547 Series of PWM Control
Power Supply ICs with Multi-functionality
and Low Standby Power
Masanari Fujii
Hiroshi Maruyama
Kokou Boku
1. Introduction
In recent years, global environmental warming has
come to be addressed as a worldwide problem and ener-
gy savings has become critical for all electric products.
In particular, televisions, audio components, notebook
computers, printers and other such peripheral devices
that are often continuously plugged into an electri-
cal outlet remain in their standby state for a longer
duration of time than their actual time of usage, and
therefore functions for reducing the power consump-
tion during standby have become essential. Requests
for lower standby power consumption in power supply
units have also intensified year after year.
In response to these requests, Fuji Electric has
already developed a series of control ICs for use in
switching mode power supply units to convert commer-
cial AC power (100 V or 240 V) to a DC power supply.
Recently, Fuji Electric has developed the FA5553 / 5547
series of 8-pin current mode PWM (pulse width
modulation) control power supply ICs which feature
enhanced low standby power performance and added
protection functions suitable for various products. An
overview of this new product series is presented below.
2. Product Overview
Fuji Electric has developed a series of AC-DC
power supply ICs for driving externally attached power
MOSFETs fabricated using a 30 V CMOS (comple-
mentary metal-oxide-semiconductor) process, and this
newly developed IC series is listed in Table 1. This IC
series is used as a PWM IC on the primary side in the
conceptual diagram of a switching mode power supply
shown in Fig. 1.
2.1 Characteristics
As indicated in Table 1 each unit type is provided
Fig.1 Conceptual diagram of switching mode power supply
AC power
supply
Primary side Secondary side
+
C1 Half-wave
RVH
PWM IC
LAT VH
FB (NC)
IS VCC
GND OUT
+ MOS
C2 gate
signal
RS
Main
winding
Auxiliary
winding
Secondary side
Output voltage /
current
+
Table 1 Characteristics of PWM IC series for low standby power
Series
Model
Power
Package
supply
configu-
ration
Input Operating
range frequency
Overload
Protection function
Low standby power function
Over-
voltage
Latch by
an external
signal
(overheat)
Brown-
out
Startup
circuit
Min. operating
frequency
during standby
Overload
line com-
pensation
loss
FA5528 FA5528
FA5553
FA5547
FA5553
FA5554
FA5566
FA5567
FA5546
FA5547
SOP/
DIP8
SOP/
DIP8
SOP/
DIP8
Flyback
10 to
26 V
Flyback
10 to
26 V
Flyback
10 to
26 V
60 kHz Timer latch Latch
60 kHz
100 kHz
60 kHz
Auto-restart
Timer latch
Auto-restart
Timer latch
Auto-restart
Timer latch
Latch
Latch
Yes
Yes
Yes
No Yes 1.1 kHz < 70 mW
No Yes 0.35 kHz < 5 mW
Yes Yes 0.5 kHz < 5 mW
: New product
68 Vol. 54 No. 2 FUJI ELECTRIC REVIEW




FA5553 pdf, 반도체, 판매, 대치품
Fig.8 Conceptual diagram of overcurrent operation in re-
sponse to pulsed load current
Secondary
side output
voltage
Secondary
side output
current
MOSFET
gate voltage
Rating
Current
limit level
Overload
detection
current
0
VCC
0
OLP period within 200 ms
(a) When OLP period is within 200 ms
Secondary
side output
voltage
Secondary
side output
current
MOSFET
gate voltage
Rating
0
Current
limit level
Overload
detection
current
0
VCC
0
OLP period greater Stop switching
than 200 ms
(b) When OLP period is greater than 200 ms
well as overload protection are required in some power
supplies used for ink jet printers and other such motor
loads. Figure 8 shows conceptual diagrams of the over-
current operation in response to pulsed load current.
Figure 8 (a) shows the case in which when the overload
period is not more than 200 ms, even if the second-
ary-side output current is larger than the overload
detection current level, the IC will continue switching
and the secondary-side output voltage will be main-
tained until reaching the current limiting level. At
loads above the current limiting level, the primary-side
switching current is limited pulse-by-pulse, and the
secondary-side output voltage decreases. However, as
in Fig. 8 (b), if the load period is 200 ms or greater, the
IC is latched and stopped and the switching operation
is also stopped.
3. Application to Power Supply Circuit
Characteristics of a switching mode power supply
that uses the FA5553 are described below.
3.1 Power supply efficiency characteristics
Main specifications of the power supply are listed
below.
Fig.9 Relationship between load current and power supply
efficiency
100
90
80
70
60
50
40
0
100 V AC
264 V AC
0.5 1.0
Load current (A)
1.5
(1) Input voltage: 90 to 264 V AC, 50 / 60 Hz
(2) Output: 19 V DC, 0 to 3.42 A (65 W)
(3) IC used: FA5553 (60 kHz operating frequency)
Figure 9 shows the relationship between load cur-
rent and power supply efficiency for input voltages
of 100 V and 264 V AC, and a load current of 1.5 A or
less. A high efficiency of at least 80% is reached when
the input voltage is 100 V AC and the load current is
80 mA or more and when the input voltage is 264 V AC
and the load current is 0.3 A or more. In particular,
there is only a small decrease in efficiency in regions
where the load current is low. Figure 10 shows the cir-
cuit diagram of this power supply.
3.2 Operating frequency characteristics
Figure 11 shows the relationship between load
current and operating frequency for input voltages of
100 V and 264 V AC. In the load current range from
0 to 0.9 A, the operating frequency decreases linearly,
and the IC’s light load frequency decreasing function,
shown in Fig. 3, operates in this range. This function
enables a high power supply efficiency to be main-
tained even in the light load region with the power
supply efficiency shown in Fig. 9.
3.3 Standby power characteristics
Figure 12 shows the relationship between input
voltage and input power (standby power) during un-
loaded output operation. In the input voltage range
of 90 to 240 V AC, the input power is small as 0.1 W.
These characteristics are made possible by embedding
a startup circuit into the IC, decreasing the operating
frequency during light load operation, and decreasing
the overload line compensation loss.
As described above, use of the newly developed
FA5553 series and the FA5547 series enable higher ef-
ficiency due to lower standby power and various types
of required protection functions to be realized with a
FA5553/5547 Series of PWM Control Power Supply ICs with Multi-functionality and Low Standby Power
71

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