IP35063J SEME-LAB [Seme LAB], IP35063J Datasheet - Page 3

• Manufacturer Part Number: IP35063J
• Description: DC-DC CONVERTER CONTROL CIRCUIT
• Manufacturer: SEME-LAB [Seme LAB]

V
V
The following power supply characteristics must be chosen:–
V
V
I
f
V
Semelab plc.
OUT
MIN
SAT
F
IN
OUT
ripple(p–p)
— Saturation voltage of the output switch.
— Forward voltage drop of the ringback rectifier.
— Nominal input voltage. If this voltage is not constant, then use V
— Desired output voltage, V
— Desired output current.
— Minimum desired output switching frequency at the selected values for V
— Desired peak–to–peak output ripple voltage. In practice, the calculated value will need to be increased
(t
ON
Calculation
step–up converter.
due to the capacitors 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.
I
pk(switch)
+ t
L
t
R
Telephone [phone]. Telex: 341927. Fax [phone].
t
(MIN)
OFF
C
C
ON
OFF
SC
O
T
)
MAX
OUT
DESIGN FORMULA TABLE
V
IN(MAX)
= 1.25 1 +
I
V
pk(switch)
I
IN(MAX)
pk(switch)
- V
(
0.33 / I
SAT
Step–Down
8 V
4 x 10
2 I
V
OUT
OUT(MAX)
R2
R1
KEY
ripple(p–p)
- V
- V
f
MIN
(t
1
pk(switch)
-5
ON
SAT
OUT
+ V
)
.
t
ON
+ t
F
- V
t
OFF
ON(MAX)
OUT
)
IN(MAX)
V
IN
IN(MIN)
2 I
for step–down and V
I
and I
pk(switch)
OUT(MAX)
V
OUT
0.33 / I
V
- V
O
IN(MIN)
4 x 10
.
Step–Up
+ V
I
OUT
SAT
V
f
ripple
MIN
F
1
pk(switch)
t
-5
ON
- V
t
- V
ON
t
t
ON(MAX)
ON
t
IN(MIN)
SAT
+ t
OFF
IP35063
IP33063
IP34063
OFF
Prelim. 2/95
IN(Min)
for