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FA13842N Schematic ( PDF Datasheet ) - Fuji Electric

Teilenummer FA13842N
Beschreibung CMOS IC(For Switching Power Supply Control)
Hersteller Fuji Electric
Logo Fuji Electric Logo 




Gesamt 15 Seiten
FA13842N Datasheet, Funktion
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






FA13842N Datasheet, Funktion
FA13842, 13843, 13844, 13845
ISNS threshold voltage vs. COMP voltage
1200
1000
VCC= 15V
FB= 0V
OUT= off
800
600
400
200
0
0 1 234
COMP voltage (V)
COMP source current vs. COMP voltage
0
–200
–400
–600
–800
–1000
–1200
5 012 3 4
COMP voltage (V)
5
COMP to ISNS offset voltage vs. temperature
2.5
2
1.5
1
0.5
0
–50
0 50 100
Temperature (˚C)
150
Error amp open loop voltage gain and phase vs.
frequency
100
0
80
60 Phase
40
Gain
20
0 180
–20
–40
10
100 1.0k 10k 100k 1.0M 10M
Frequency (Hz)
COMP source current vs. temperature
–800
–900
VCC= 15V
COMP= 0V
–1000
–1100
–1200
–1300
–1400
–50
0 50 100
Temperature (˚C)
VREF short circuit current vs. temperature
80
VCC= 15V
VREF= 0V
70
60
50
40
30
20
0 50 100
Temperature (˚C)
150
150
6

6 Page









FA13842N pdf, datenblatt
FA13842, 13843, 13844, 13845
4. Soft start
A soft-start circuit is shown in Fig. 15.
An aproximate soft-start time is determined with the following
calculation. This soft-start time is defined as the time the ISNS
terminal threshold voltage increases from 0V to 1V.
tsoft-start [ms]=4.3•C9[µF]
5. Suppression of noise at the current sensing
terminal
As each cycle current value is monitored in the current mode
control, there is the possibility that a malfunction will occur
even with a relatively low noise level. Therefore, it is
necessary to add a CR filter to reduce the level of noise at the
current sensing terminal. (See Fig. 16.)
6. ON/OFF circuit with an external signal
A typical ON/OFF circuit is shown in Fig. 17.
The output stage (OUT terminal) is enabled when the voltage
at the FB terminal is reduced to less than 2.0V and is disabled
when the FB terminal voltage increases to more than 3V.
Set the voltage of the FB terminal at a maximum of 5.3V in this
case.
8 REF
4
R17
D7 1M
D8
C9
2
1
OSC
1mA
+ 2R
ER AMP
1R
Fig. 15
5
AC INPUT
DB
~+
~
T1
+
C1
FA13842
6
3
MOSFET
R18
C10
Rs
Fig. 16
7
8
30V
REF
R19 4
ON/OFF signal
Tr6
2
1
+
ER AMP
OSC
2R
1R
5
Fig. 17
12

12 Page





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