TS34063A TSC [Taiwan Semiconductor Company, Ltd], TS34063A Datasheet - Page 7

• Manufacturer Part Number: TS34063A
• Description: Dc to Dc Converter Controller
• Manufacturer: TSC [Taiwan Semiconductor Company, Ltd]

TS34063A
Design Formula Table
Terms and Definitions
(
The following power supply characteristics must be chosen:
Ipk(switch)
t
on+
L(min)
Vsat = Saturation Voltage of the output switch.
Vf = Forward Voltage drop of the rectifier.
Vin= Normal input voltage
Vout: Desied Output voltage, |Vout| =1.25 (1+R2 / R1)
Iout : Desired output current.
fmin : Minimum desired output switching frequency at the selected values for Vin and Io.
Vripple(p-p): 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.
Test
Rsc
t
t
CT
Co
on
off
t
off )
⎛
⎜ ⎜
⎝
Vin(
Vout
2Iout(max)
Ipk(switch
min
Vcc
⎛
⎜ ⎜
⎝
⎛
⎜ ⎜
⎝
9
4.0 x 10
+
Ipk
Vripple
(min)
)
Step Up
Vf
Iout
−
f
(
Vsat
0
switch
)
min
1
−
3 .
⎛
⎜ ⎜
⎝
*
–5
Vin
−
toff
ton
(
ton
⎞
⎟ ⎟
⎠
pp
t
*
Vsat
on
ton(
)
(min)
)
⎞
⎟ ⎟
⎠
+ 1
⎞
⎟ ⎟
⎠
max
⎞
⎟ ⎟
⎠
)
7-8
⎛
⎜ ⎜
⎝
Vin
⎛
⎜ ⎜
⎝
(min)
Ipk
Ipk
Vcc
(
⎛
⎜ ⎜
⎝
switch
(
4.0 x 10
−
8
switch
Ipk
Vout
Vripple
Step Down
−
Vsat
2Iout(max)
Vsat
f
(
0
switch
min
1
−
)(
)
3 .
+
Vout
ton
–5
(
Vf
−
pp
t
Vout
on
+
)
⎞
⎟ ⎟
⎠
)
⎞
⎟ ⎟
⎠
*
toff
ton
)
(max)
⎞
⎟ ⎟
⎠
2005/02 rev. A
⎛
⎜ ⎜
⎝
Vin
2Iout(max)
Ipk
(min)
Voltage Inverting
⎛
⎜ ⎜
⎝
⎛
⎜ ⎜
⎝
9
(
4.0 x 10
|
Vcc
switch
Ipk
Vout
Vripple
Iout
−
f
(
Vsat
0
switch
−
min
1
)
3 .
+ |
⎛
⎜ ⎜
⎝
Vsat
*
–5
toff
ton
(
ton
⎞
⎟ ⎟
⎠
Vf
*
pp
t
on
ton
)
)
⎞
⎟ ⎟
⎠
+ 1
⎞
⎟ ⎟
⎠
(max)
⎞
⎟ ⎟
⎠