FA13842 Datasheet, PDF (2/15 Pages) Fuji Electric – CMOS IC(For Switching Power Supply Control)

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
SQ
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
IZ
Output peak current
IO
FB/ISNS terminal input voltage
Error amplifier sink current
Total power dissipation
VIN
ISINK
Pd
Thermal resistance
Rθ j-a
Junction temperature
Tj
Ambient temperature
Ta
Storage temperature
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