ip35063 Semelab Group, ip35063 Datasheet - Page 4

• Manufacturer Part Number: ip35063
• Description: Dc-dc Converter Control Circuit
• Manufacturer: Semelab Group

Semelab plc.
Step–Down, External PNP Saturated Switch
V I N
V IN
25V
V IN
R S C
Step–Down, External NPN Switch
100 F
0.33
R SC
R SC
1.2K
R1
8
7
6
5
8
7
6
5
Telephone [phone]. Telex: 341927. Fax [phone].
Step–Down Converter
8
7
6
5
V CC
COMPARATOR
COMPARATOR
C O M PA RA TO R
I pk
OSCILLATOR
OSCILLATOR
O S CILLA TO R
3.3K
S
R
S
R
R2
S
R
Q
Q
REGULATOR
REGULATOR
REFERENCE
REFERENCE
C T
Q
R EF ER EN C E
RE G UL AT O R
1.25 V
1.25 V
170
170
External Current Boost Connections for I
1.2 5 V
170
Q2
Q2
Q2
Q 2
Q1
Q1
Q1
Q1
1
2
3
4
1
2
3
4
APPLICATIONS INFORMATION
1
2
3
4
1N5822
470pF
C T
470 F
220 H
C O
V OUT
5.0V
500mA
L
V OUT
V O U T
V IN
1 2 V
V IN
V IN
Step–Up, External NPN Saturated Switch
100 F
0.22
R SC
R SC
2 . 2 K
R 1
R SC
1 8 0
Step–Up, External NPN Switch
C
8
7
6
5
8
7
6
5
8
7
6
5
Step–Up Converter
> 1.5A
V CC
COMPARATOR
COMPARATOR
C O M PA RA TO R
I p k
OSCILLATOR
OSCILLATOR
O SC ILL AT O R
S
R
S
R
S
R
4 7 K
R 2
L 170 H
Q
Q
REGULATOR
REGULATOR
REFERENCE
REFERENCE
Q
C T
R EF ER EN CE
RE G UL ATO R
1.25 V
1.25 V
170
170
1 .25 V
1 70
Q2
Q2
Q2
Q1
Q1
Q 1
1
2
3
4
1
2
3
4
1
2
3
4
1 5 0 0 p F
C T
IP35063
IP33063
IP34063
1N5819
R – 0 F O R
C O NS TA NT V IN
1500 F
C O
Prelim. 2/95
V OUT
2 8 V
1 7 5 m A
V OUT
V O U T