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參數資料
| 型號： | FA3647N |
| 廠商： | FUJI ELECTRIC CO LTD |
| 元件分類： | 穩壓器 |
| 英文描述： | PWM control IC with light load power saving function For Switching Power Supply Control |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數： | 3/21頁 |
| 文件大小： | 406K |
| 代理商： | FA3647N |
FA3641P(N), FA3647P(N)
60
I
Electrical characteristics
(Vcc=18V, R
T
=47k
, Ta=25
C)
Reference voltage section
Oscillator section
Item
Symbol
f
OSC
f
dV
f
dT
Test condition
R
T
=47k
, Tj=25
C
V
CC
=10 to 28V
Ta=
–
30 to +85
°
C
Min.
Typ.
Max.
Unit
Oscillation frequency
92.6
100
±
1.6
±
0.02
107.4
kHz
Frequency variation 1 (Voltage stability)
%
% /
°
C
Frequency variation 2 (Temperature stability)
I
Recommended operating condition
Item
Symbol
Min.
Typ.
Max.
Unit
Supply voltage
V
CC
10
28
V
μ
F
μ
F
kHz
REF pin bypass capacitor
C
ref
0.1
0.47
Soft-start capacitor
C
S
0.01
1
Oscillation frequency (FB >1.2V)
f
OSC
30
500
Min.oscillation frequency at light load mode
(FB <1.2V)
f
OSCL
10
kHz
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Reference voltage
VREF
Tj=25
C
4.75
5.00
±
6
±
6
±
0.5
5.25
±
20
±
20
V
Voltage variation 1 (Line regulation)
V
dV
V
CC=
10 to 28V
mV
Voltage variation 2 (Load regulation))
V
dV
I
L
=0 to 10mA, V
cc
=18V
Ta=
–
30 to +85
°
C
mV
mV/
°
C
Voltage variation 3 (Temperature stability)
V
dT
Pulse width modulation circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
μ
A
V
FB pin source current
I
FB
V
FB
=0V
–
985
–
750
–
615
Input threshold voltage (FB pin)
V
TH FBO
Duty cycle =0%
Duty cycle =
D
MAX
V
FB
=2.5V
0.95
1.03
V
TH FBM
2.40
V
Maximum duty cycle
D
MAX
66
70
74
%
Reducing oscillation frequency section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
FB pin threshold voltage
V
TH FBS
k
f
S1
1.18
V
Frequency reduction
V
FB
=1.10 to 1.15V
16.7
kHZ
Minimum oscillation frequency
f
osc
S2
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)
V
TH
IS
215
235
255
–
188
–
168
–
148
mV
μ
A
ns
Input terminal source current (IS pin)
I
IS
V
IS
=0V
–
5
–
20
Delay time
T
PD IS
150
150
Soft-start circuit section
Item
Symbol
I
CHG
V
TH CSO
V
TH CSM
Test condition
Min.
Typ.
Max.
Unit
μ
A
V
Charge current (CS pin)
V
CS
=1V, Tj=25
C
–
4.0
–
6.5
–
9.0
Input threshold voltage (CS pin)
Duty cycle =0%
Duty cycle =
D
MAX
0.95
1.03
2.40
V
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