LAB
TOP VIEW
V
CC
V
Z
FEEDBACK
GAIN
1
8
SEME
IP5661C
IP5561C
GND
OUTPUT
CURRENT
SENSE
R
T
/C
T
2
7
SWITCHED鈥揗ODE
POWER SUPPLY
CONTROL CIRCUIT
FEATURES
鈥?STABILISED POWER SUPPLY
鈥?TEMPERATURE COMPENSATED REFERENCE
SOURCE
鈥?SAWTOOTH GENERATOR
鈥?PULSE WIDTH MODULATOR
鈥?CURRENT LIMITING
鈥?8 PIN DIP
V
CC
3
6
4
5
J Package 鈥?8 Pin Ceramic DIP
N Package 鈥?8 Pin Plastic DIP
D Package 鈥?8 Pin Plastic (150) SOIC
BLOCK DIAGRAM
R
T
C
T
5
REFERENCE
VOLTAGE
ERROR
AMP
FEEDBACK
GAIN
3
SAWTOOTH
GENERATOR
DESCRIPTION
7
S
4
OUTPUT
PWM
LATCH
R
0.5V
CURRENT
SENSE
6
STABILISED
SUPPLY
2
8.2V
V
z
1
8
V
CC
GND
The IP5561 is a control circuit for use in switched
mode power supplies. This single monolithic chip
incorporates all the control and supervisory (protection)
functions required in switched mode power supplies,
including an inter nal temperature compensated
reference source, internal zener reference, sawtooth
generator, pulse width modulator, output stage and
cycle by cycle current limit.
Order Information
Part
Number
IP5561
IP5561C
J鈥揚(yáng)ack
8 Pin
N鈥揚(yáng)ack
8 Pin
D鈥?
8 Pin
Temp.
Range
-55 to +125擄C
0 to +70擄C
Note:
To order, add the package identifier to the part number.
eg.
IP5561J
IP5561CD鈥?
ABSOLUTE MAXIMUM RATINGS
(T
case
= 25擄C unless otherwise stated)
SUPPLY
Voltage Sourced
Current Sourced
18V
30mA
OUTPUT TRANSISTOR
Output Current
Collector Voltage
(Pin 7)
Operating Junction Temperature
Storage Temperature Range
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
T
J
T
STG
40mA
18V
See Ordering Information
鈥?5 to +150擄C
Prelim. 4/95
Semelab plc.
1
2
3
4
