pj34063 ETC-unknow, pj34063 Datasheet - Page 7

• Manufacturer Part Number: pj34063
• Description: Dc To Converter Controller
• Manufacturer: ETC-unknow

T
TERMS AND DEFINITIONS
♦
♦
The following power supply characteristics must be chosen:
♦
♦
♦ Iout : Desired output current.
♦ fmin : Minimum desired output switching frequency at the selected values for V
♦ Vripple(p-p): Desired peak-to-peak output ripple voltage. in practice, the calculated capaitor value will need to be increased
(ton+toff) max
able :
Calculation
I
pk
Vsat = Saturation Voltage of the output switch.
V
V
Vout: Desied Output voltage,
L (min)
(switch)
F
in
Rsc
ton
toff
C
Co
= Normal input voltage
= Forward Voltage drop of the rectifier.
T
D
e sign

 


 

Vin
9
The ripple voltage should be kept to a low value since it will directly affect the line and load regulation.
Vripple
due to its equivalent series resistance and board layout.
Ipk
F
(min)
V
Ioutton
ormula
2Iout(max)
(
Vout+V
CC
switch
(min)-Vsat-Vout
0.3/I
−
(
4.0×10
Vsat
pp
Step-Up
)
f
PK
)
F
|Vout|=1.25 (1+

 

-Vin(min)
(switch)
min
1

 


 

-5
=
toff
ton
ton
ton
(max)
+1

 

R
R
2
1

 

)
Vin

 

7-8
(min)
Ipk
V
Ipk
CC
(
(min)-Vsat-Vout
(
switch
−
8
switch
Vripple
f
0.3/I
Vsat
4.0×10
Step-Down
V
min
2Iout(max)
1
OUT
PK
)(
−
)
+V
(switch)
Vout
ton
(
-5
pp
Dc To Converter Controller
F
ton
+

 

)
toff
=
in
ton
and.Io.
)
(max)

 


 

Vin

 

2Iout(max)
Ipk
9
(min)
Voltage-Inverting
Vripple
(
0.3/I
switch
2002/01.rev.A
4.0×10
Ioutton
−
Vsat
f
PK
Vout +V
min
)
(
(switch)
PJ34063
1
V

 

pp
-5
CC
toff

 

ton
ton
)
=
+ Vsat

 

ton
+1
(max)

 

F