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FA3647 Datasheet(PDF) 3 Page - Fuji Electric

Part No. FA3647
Description  PWM control IC with light load power saving function For Switching Power Supply Control
Download  21 Pages
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Manufacturer  FUJI [Fuji Electric]
Direct Link  http://www.fujielectric.co.jp/eng/fdt/scd
Logo FUJI - Fuji Electric

FA3647 Datasheet(HTML) 3 Page - Fuji Electric

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FA3641P(N), FA3647P(N)
60
s Electrical characteristics (Vcc=18V, RT=47k
Ω, Ta=25˚C)
Reference voltage section
Oscillator section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Oscillation frequency
fOSC
RT=47k
Ω, Tj=25˚C
92.6
100
107.4
kHz
Frequency variation 1 (Voltage stability)
fdV
VCC=10 to 28V
±1.6
%
Frequency variation 2 (Temperature stability)
fdT
Ta= –30 to +85
°C
±0.02
% /
°C
s Recommended operating condition
Item
Symbol
Min.
Typ.
Max.
Unit
Supply voltage
VCC
10
28
V
REF pin bypass capacitor
Cref
0.1
0.47
µF
Soft-start capacitor
CS
0.01
1
µF
Oscillation frequency (FB >1.2V)
fOSC
30
500
kHz
Min.oscillation frequency at light load mode (FB <1.2V)
fOSCL
10
kHz
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Reference voltage
VREF
Tj=25˚C
4.75
5.00
5.25
V
Voltage variation 1 (Line regulation)
VdV
VCC=10 to 28V
±6
±20
mV
Voltage variation 2 (Load regulation))
VdV
IL=0 to 10mA, Vcc=18V
±6
±20
mV
Voltage variation 3 (Temperature stability)
VdT
Ta= –30 to +85
°C
±0.5
mV/
°C
Pulse width modulation circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
FB pin source current
IFB
VFB=0V
–985
–750
–615
µA
Input threshold voltage (FB pin)
VTH FBO
Duty cycle =0%
0.95
1.03
V
VTH FBM
Duty cycle =
DMAX
2.40
V
Maximum duty cycle
DMAX
VFB=2.5V
66
70
74
%
Reducing oscillation frequency section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
FB pin threshold voltage
VTH FBS
1.18
V
Frequency reduction
k
fS1
VFB=1.10 to 1.15V
16.7
kHZ
Minimum oscillation frequency
foscS2
46
kHZ
Overcurrent limiting circuit section
Item
Symbol
Test condition
FA3641P/N
FA3647P/N
Unit
Min.
Typ.
Max.
Min.
Typ.
Max.
Input threshold voltage (IS pin)
VTH IS
215
235
255
–188
–168
–148
mV
Input terminal source current (IS pin)
I IS
VIS =0V
–5
–20
µA
Delay time
TPD IS
150
150
ns
Soft-start circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Charge current (CS pin)
ICHG
VCS =1V, Tj=25˚C
–4.0
–6.5
–9.0
µA
Input threshold voltage (CS pin)
VTH CSO
Duty cycle =0%
0.95
1.03
V
VTH CSM
Duty cycle =
DMAX
2.40
V


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