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Fuji Electric

FA13842N Datasheet Preview

FA13842N Datasheet

CMOS IC(For Switching Power Supply Control)

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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




Fuji Electric

FA13842N Datasheet Preview

FA13842N Datasheet

CMOS IC(For Switching Power Supply Control)

No Preview Available !

FA13842, 13843, 13844, 13845
s Block diagram
FA13842, 13843
VCC 7
30V
UVLO
UVLO
VCC 5V REF
ENB 2.5V
8 VREF
OUTPUT
ENB
6 OUT
RT/CT 4
FB 2
COMP 1
ISNS 3
ER AMP
2R
1R
OSC
5 GND
1V S Q
FF
R QB
5V Controlled block
FA13844, 13845
VCC 7
30V
UVLO
UVLO
VCC 5V REF
ENB 2.5V
8 VREF
OUTPUT
ENB
6 OUT
Pin No. Symbol Function
Description
1 COMP Compensating Error amplifier output, available
for loop compensation circuit
2 FB Feedback
Inverting input of the error
amplifier
3 ISNS Current sensing Input voltage proportional to
inductor current
4 RT/CT Oscillator control Setting oscillation frequency
and maximum duty-cycle with
resistor RT and capacitor CT
5 GND Ground
Ground
6 OUT Output
Output for driving a power
MOSFET
7
VCC Power supply
Power supply
8 VREF Reference voltage Reference voltage and
current source charging
capacitor CT through resistor
RT
RT/CT 4
FB 2
COMP 1
ISNS 3
ER AMP
2R
1R
OSC
5 GND
1V
SQ
TFFQ
RFFQB
CLK
QB
5V ControlIed block
s Absolute maximum ratings (Ta=25˚C)
Item
Supply voltage
Symbol
VCC
Zener current
Output peak current
IZ
IO
FB/ISNS terminal input voltage
Error amplifier sink current
Total power dissipation
VIN
ISINK
Pd
Thermal resistance
Rθ j-a
Junction temperature
Ambient temperature
Storage temperature
Tj
Ta
Tstg
Test condition
Low impedance source
Zener clamp (Icc<10mA)
Source current
Sink current
FB, ISNS
at Ta < 50˚C
Junction-air
DIP
SOP
DIP
SOP
Rating
28
Self limiting
10
400
1
–0.3 to 5.3
10
800
400
125
250
150
–25 to 85
–40 to 150
Unit
V
V
mA
mA
A
V
mA
mW
˚C/W
˚C
˚C
˚C
2


Part Number FA13842N
Description CMOS IC(For Switching Power Supply Control)
Maker Fuji Electric
Total Page 15 Pages
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