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PDF FA13845P Data sheet ( Hoja de datos )
| Número de pieza | FA13845P | |
| Descripción | CMOS IC(For Switching Power Supply Control) | |
| Fabricantes | Fuji Electric | |
| Logotipo |  |
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FA13842,13843,13844,13845
CMOS IC
For SFwAit1c3h8in4g2,P1o3w8e4r3S, u1p3p8l4y4C, o1n3t8r4o5l
s Description
The FA1384X series are CMOS current mode control ICs for
off-line and DC-to-DC converters.
These ICs can reduce start-up circuit loss and are optimum for
high efficiency power supplies because of the low power
dissipation achieved through changes in the CMOS fabrication
process.
These ICs can drive a power MOSFET directly.
The high-performance, compact power supply can be
designed with minimal external components .
s Features
• CMOS process
• Low-power dissipation
• Standby current 2µA (max.), start-up current 30µA (max.)
• Pulse-by-pulse current limiting
• 5V bandgap reference
• UVLO (Undervoltage lockout) with hysteresis
• Maximum duty cycle FA13842, 13843: 96%
FA13844, 13845: 48%
• Pin-for-pin compatible with UC384X
Note: Pins are fully compatible, but characteristics are not.
When our ICs are applied to a power supply circuit
designed for other manufactures' 384X series, the
characteristics and safety features of the power supply
must be checked.
s Types of FA1384X series
Type
UVLO
Maximum duty Package
Start threshold Stop threshold cycle
FA13842P 16.5V±1V
9V± 1V
96%
DIP
FA13842N
SOP
FA13843P 9.6V±1V
9V± 1V
96%
DIP
FA13843N
SOP
FA13844P 16.5V±1V
9V± 1V
48%
DIP
FA13844N
SOP
FA13845P 9.6V±1V
9V± 1V
48%
DIP
FA13845N
SOP
s Dimensions, mm
SOP-8
85
14
4.9
0.4±0.1 1.27±0.2
DIP-8
8
5
1 9.3 4
1.5
2.54±0.25 0.46±0.1
7.62
0~15˚
0.25+–00.1.05
0~15˚
1
1 page  
s Characteristic curves (Ta=25˚C)
Timing resistance vs. oscillation frequency
FA13842, FA13843
100
2.2nF
CT=10nF
470pF
10
FA13842, 13843, 13844, 13845
Output dead time vs. oscillation frequency
FA13842, FA13843
100
VCC= 15V
Ta= 25˚C
2.2nF
CT=10nF
10
470pF
VCC= 15V
Ta= 25˚C
1
1
10 100
Oscillation frequency (kHz)
Timing resistance vs. oscillation frequency
FA13844, FA13845
100
2.2nF
470pF
CT=10nF
1000
10
VCC= 15V
Ta= 25˚C
1
1 10 100
Oscillation frequency (kHz)
RT/CT discharge current vs. temperature
10
9.5
9
8.5
8
7.5
7
–50
0 50 100
Temperature (˚C)
1000
150
1
10 100
Oscillation frequency (kHz)
Output dead time vs. oscillation frequency
FA13844, FA13845
100
VCC= 15V
Ta= 25˚C
90
1000
80
70 470pF
2.2nF
CT=10nF
60
50
40
10
100
Oscillation frequency (kHz)
1000
Output max. duty cycle vs. timing resistance
FA13842, FA13843
100
90
80
70
60
50
40
1
25
RT timing resistance (kΩ)
10
5
5 Page 
3-1 The method of detecting an overvoltage (detection
on primary side)
A typical latched shutdown circuit to protect against
overvoltages detected on the primary side is shown in Fig. 11.
When the secondary voltage increases in the flyback circuit,
the voltage of the bias winding also increases in proportion.
When this voltage increase is detected by zener diode ZD1, a
latched shutdown is accomplished. As the secondary voltage
is detected through a transformer, detection accuracy is low.
3-2 The method of detecting an overvoltage (detection
on secondary side)
A typical latched shutdown circuit to protect against
overvoltages detected on the secondary side is shown in
Fig. 12.
The detected voltage accuracy is high compared to
overvoltage detection on the primary side.
3-3 The method of detecting an overcurrent (detection
of primary current)
A typical primary overcurrent detection circuit is shown in
Fig. 13.
3-4 The method of detecting an overcurrent (detection
of secondary current)
A typical secondary overcurrent detection circuit is shown in
Fig. 14.
DB
~+
AC INPUT
~
R1
R6
ZD1
7
FA13842
1
6
T1
+
C1
D1
+
C2
MOSFET
Rs
R4
Tr2 D5
Tr1
R3
C6
Fig. 11
FA13842, 13843, 13844, 13845
AC INPUT
DB
~+
~
T1
+
C1
D6
+
C7
R1
R6
7
FA13842
1
6
D1
+
C2
MOSFET
Rs
R9
ZD2
PC1
R4
Tr2
D5
Tr1
R3
C6
R8
R7 PC1
Fig. 12
AC INPUT
DB
~+
~
T1
+
C1
R1 D1
+
R6 C2
7
FA13842
6
13
MOSFET
R12
R4
Tr2
D5
Tr1
R3
C6
Tr3
C8
Fig. 13
Rs
R11
R10
DB
~+
AC INPUT
~
R1
R6
7
FA13842 6
1
R4
Tr2 D5
Tr1
R3
C6
R7
T1 D6
R13
+
+
C1 C7 Tr4
D1
+
C2
MOSFET
Rs
R8
PC1
R15
R16
Fig. 14
R14
PC1
Tr5
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet FA13845P.PDF ] | |
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