Design formula table, Ordering information – Diodes AP34063 User Manual
Page 8
AP34063
Document number: DS31004 Rev. 6 - 2
8 of 11
September 2012
© Diodes Incorporated
AP34063
Design Formula Table
Calculation Step-Up
Step-Down Voltage-Inverting
t
ON
/ t
OFF
V
OUT
+ V
F
–V
IN(MIN)
V
OUT
+ V
F
I
V
OUT
l + V
F
V
IN(MIN)
– V
SAT
V
IN(MIN)
– V
SAT
– v
OUT
V
IN(MIN)
– V
SAT
( t
ON
+ t
OFF
)
1/f 1/f
1/f
t
OFF
t
ON
+ t
OFF
t
ON
+ t
OFF
t
ON
+ t
OFF
t
ON
+1
t
ON
+1
t
ON
+1
t
OFF
t
OFF
t
OFF
t
ON
(
t
ON
+t
OFF
) – t
OFF
(
t
ON
+t
OFF
) – t
OFF
(
t
ON
+t
OFF
) – t
OFF
C
T
4.0
× 10-5 t
ON
4.0
× 10-5 t
ON
4.0
× 10-5 t
ON
I
PK
(switch) 2I
OUT(MAX)
(t
ON
/ t
OFF
+1)
2I
OUT(MAX)
2I
OUT(MAX)
(t
ON
/ t
OFF
+1)
R
SC
0.3 / I
PK (SWITCH)
0.3 / I
PK (SWITCH)
0.3 / I
PK (SWITCH)
L
(MIN)
( V
IN(MIN)
– V
SAT
)
t
ON(MAX)
(V
IN(MIN)
– V
SAT
– V
OUT
)
t
ON(MAX)
( V
IN(MIN)
– V
SAT
)
t
ON(MAX)
I
PK (SWITCH)
I
PK (SWITCH)
I
PK (SWITCH)
C
O
9
I
OUT
t
ON
I
PK (SWITCH)
(t
ON
+ t
OFF
)
9
I
OUT
t
ON
V
RIPPLE (pp)
8V
RIPPLE (pp)
V
RIPPLE (pp)
V
SAT
= Saturation voltage of the output switch.
V
F
= Forward voltage drop of the output rectifier.
The following power supply characteristics must be chosen:
V
IN
- Nominal input voltage.
V
OUT
- Desired output voltage, |V
OUT
| = 1.25 (1+R2/R1)
I
OUT
- Desired output current.
F
MIN
- Minimum desired output switching frequency at the selected values of V
IN
and I
O
.
V
RIPPLE(pp)
- Desired peak-to-peak output ripple voltage. In practice, the calculated capacitor value will need to 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.
Ordering Information
Package
Packing
Lead Free
L : Lead Free
G : Green
S8 : SO-8
N8 : PDIP-8
U : Tube
13 : Tape & Reel
AP 34063 XX X - X
Part Number
Package
Code
Packaging
Tube
13” Tape and Reel
Quantity
Part Number
Suffix
Quantity
Part Number Suffix
AP34063S8L-13
S8
SO-8
NA
NA
2500/Tape & Reel
-13
AP34063S8G-13
S8
SO-8
NA
NA
2500/Tape & Reel
-13
AP34063N8L-U N8
PDIP-8
60
-
U
NA
NA
Pb
Lead-Free
Pb
Lead-Free