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参数资料
| 型号： | FA7703V |
| 厂商： | FUJI ELECTRIC CO LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 0.4 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 1.10 MM, TSSOP-16 |
| 文件页数： | 11/21页 |
| 文件大小： | 242K |
| 代理商： | FA7703V |
19
Quality is our message
FA7703/04
(11)Setting of the output voltage of DC-DC
converter
Figure 13 shows the ways to set each channel
of the output voltage of DC-DC converter. The
precision
of
output
voltage
based
on
FA7703/04’s characteristics depends on the
variation of the voltage of VB (±2%) and VREF
(±1%),
and
also
on
offset
voltage,
and
temperature characteristics.
selection Guide
Ch1
Buck, Boost, Fly-back
FA7703
Ch2
Buck, Inverting (Pch driven)
Ch1
Buck, Boost, Fly-back
FA7704
Ch2
Boost, Fly-back (Nch driven)
If using FA7703/04, and building:
In the case of a boost, a buck, or a fly-back circuit
in ch1, the output voltage can be calculated with:
B
V
R
Vout
×
+
=
2
1
If using FA7703, and building:
A buck circuit in ch2, the output voltage can be
calculated with:
REF
V
R
Vout
×
+
=
3
4
3
2
A inverting circuit in ch2, the output voltage can
be calculated
with the following formula. (the output voltage is
negative.)
REF
V
R
V
R
Vout
×
×
+
=
3
4
1
3
4
3
2
,where
REF
R
V
V
8
7
8
1
×
+
=
The ratio of resistance can be calculated with:
1
2
1
4
3
V
Vout
V
R
REF
+
=
(Use the absolute value of Vout2 voltage)
If setting R7=R8, then,
×
=
3
2
4
3
2
R
V
Vout
REF
If using FA7704, and building:
A boost, or fly-back circuit in ch2, the output
voltage can be calculated with:
REF
V
R
Vout
×
+
=
3
4
3
2
13
12
11
7
10
+
-
Vout1
R1
R2
VB
(1.0V)
IN1-
FB1
OUT1
SEL1
Ch1:Buck(FA7703/04)
13
12
11
7
16
10
+
-
Vout1
R1
R2
VB
(1.0V)
IN1-
FB1
OUT1
SEL1
REG
C h1:B oost(F A 7703/04)
4
14
8
6
5
7
+
-
Vout2
R3
R4
IN2-
FB2
OUT2
IN2+
REF
C h2:B uck(FA 7703)
4
14
8
6
5
7
+
-
Vout2
R3
R4
IN2-
FB2
OUT2
IN2+
REF
R7
R8
Ch2:Inverting(FA7703)
V1
4
14
8
6
5
7
+
-
Vout2
R3
R4
IN2-
FB2
OUT2
IN2+
REF
C h2:B oost(FA 7704)
Please note that DO NOT leave SEL1 terminal
open in operation, and be sure to connect it to
GND or VREG terminal.
Fig.13
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