AP34063CN8 International Power Sources, Inc., AP34063CN8 Datasheet - Page 10

• Manufacturer Part Number: AP34063CN8
• Description: Universal DC/DC Converter
• Manufacturer: International Power Sources, Inc.

Universal DC/DC Converter
V
V
The following power supply characteristics must be chosen:
V
V
I
f
V
Anachip Corp.
www.anachip.com.tw
out
min
sat
F
in
out
ripple(pp)
= Forward voltage drop of the output rectifier.
-Nominal input voltage.
-Desired output current.
-Minimum desired output switching frequency at the selected values of V
Design Formula Table
= Saturation voltage of the output switch.
-Desired output voltage, |V
Calculation
I
-Desired peak-to-peak output ripple voltage, In practice, the calculated capacitor value will need to
pk
(t
be increased due to its equivalent series resistance and board layout. The ripple voltage should be
kept to a low value since it will directly affect the line and load regulation.
t
on
(switch)
L
on
R
C
C
t
t
(min)
+ t
off
on
/t
sc
O
T
off
off
)
2I
(V
9
V
out(max)
in(min)
out
I
4.0×10 -5 t
(t
0.3/I
V
pk(switch)
t
t
V
Step-Up
on
off
on
in(min)
I
+V
out
t
ripple(pp)
out
on
– V
+t
|=1.25(1+R2/R1)
1/f
(t
pk(switch)
F
+t
t
off
on
on
-V
- V
sat
off
)-t
/t
+1
in(min)
off
off
on
)
sat
+1)
t
on(max)
(V
in(min)
10/10
I
pk(switch)
v
in(min)
I
Step-Down
4.0×10 -5 t
(t
0.3/I
pk(switch)
8V
t
t
on
off
– V
on
2I
v
t
on
ripple(pp)
out
+t
out(max)
-v
1/f
(t
pk(switch)
sat
+t
off
off
+v
sat
off
-V
)-t
+t
F
+1
- v
off
out
on
on
out
)
)
t
on(max)
in
9
and I
(V
2I
Voltage-Inverting
out(max)
in(min)
o
V
I
.
(t
4.0×10 -5 t
0.3/I
pk(switch)
I
t
t
ripple(pp)
on
off
out
Iv
on
t
V
on
out
– V
t
+t
in
on
1/f
(t
pk(switch)
+t
AP34063
off
l+v
on
-v
sat
off
)-t
+1
sat
/t
F
Rev.A5 Feb.10, 2004
)
off
off
on
+1)
t
on(max)