IP1842 SERIES
IP1843 SERIES
TOP VIEW
CURRENT MODE
1
2
3
4
8
7
6
5
VREF
COMP
VFB
REGULATING
PULSE WIDTH
MODULATORS
VCC
ISENSE
RT /CT
OUTPUT
GROUND
J Package – 8 Pin Ceramic DIP
N Package – 8 Pin Plastic DIP
D-8 Package – 8 Pin Plastic (150) SOIC
FEATURES
• Guaranteed ±1% reference voltage tolerance
• Guaranteed ±10% frequency tolerance
• Low start–up current (<500 A)
TOP VIEW
14
13
12
11
10
9
1
2
3
4
5
6
7
VREF
COMP
N/C
• Under voltage lockout with hysteresis
N/C
• Output state completely defined for all supply
and input conditions
VFB
VCC
• Interchangeable with UC1842 and UC1843
series for improved operation
N/C
VC
ISENSE
N/C
OUTPUT
GROUND
• 500kHz operation
POWER
GROUND
8
R
T /CT
D-14 Package – 14 Pin Plastic (150) SOIC
Order Information
Part
Number
J–Pack
8 Pin
N–Pack
8 Pin
D–8
8 Pin
D–14
14 Pin
Temp.
Range
Note:
To order, add the package identifier to the
part number.
IP1842
IP2842
IP3842
IP1843
IP2843
IP3843
✔
✔
✔
✔
✔
✔
-55 to +125°C
-25 to +85°C
0 to +70°C
-55 to +125°C
-25 to +85°C
0 to +70°C
✔
✔
✔
✔
✔
✔
eg.
IP1842J
IP3843D-14
✔
✔
✔
✔
✔
✔
ABSOLUTE MAXIMUM RATINGS (T
= 25°C unless otherwise stated)
case
(low impedance source)
V
Supply Voltage
+30V
Self limiting
CC
(I < 30mA)
CC
I
Output Current
±1A
5 J
O
Output Energy
(capacitive load)
(pins 2 and 3)
Analog Inputs
–0.3V to +V
10mA
CC
Error Amp Output Sink Current
Power Dissipation
P
P
T
T
= 25°C
= 25°C
1W
10mW/°C
D
amb
case
Derate @ T
> 50°C
amb
Power Dissipation
Derate @ T > 25°C
2W
24mW/°C
D
case
T
T
Storage Temperature Range
Lead Temperature
–65 to 150°C
+300°C
STG
(soldering, 10 seconds)
L
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk
Prelim.3/00