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IP1845A

Description
CURRENT MODE REGULATING PULSE WIDTH MODULATORS
File Size46KB,6 Pages
ManufacturerSEME-LAB
Websitehttp://www.semelab.co.uk
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IP1845A Overview

CURRENT MODE REGULATING PULSE WIDTH MODULATORS

LAB
TOP VIEW
COMP
1
V
FB
2
I
SENSE
3
R
T
/C
T
4
8
7
6
5
SEME
IP1844A SERIES
IP1845A SERIES
V
REF
V
CC
OUTPUT
GROUND
CURRENT MODE
REGULATING
PULSE WIDTH
MODULATORS
FEATURES
Guaranteed ±1% reference voltage tolerance
Accurate oscillator discharge current
Guaranteed ±10% frequency tolerance
Low start–up current (<500
m
A)
Under voltage lockout with hysteresis
Output state completely defined for all supply
and input conditions
• Interchangeable with IP and UC1844/5 series for
improved operation
• 500kHz Oscillator operation
250kHz Output operation
J Package – 8 Pin Ceramic DIP
N Package – 8 Pin Plastic DIP
D-8 Package – 8 Pin Plastic (150) SOIC
TOP VIEW
COMP
1
N/C
2
14
13
12
11
10
9
8
V
REF
N/C
V
CC
V
C
OUTPUT
GROUND
POWER
GROUND
V
FB
3
N/C
4
I
SENSE
5
N/C
6
R
T
/C
T
7
D-14 Package – 14 Pin Plastic (150) SOIC
Part
Number
IP1844A
IP2844A
IP3844A
IP1845A
IP2845A
IP3845A
J–Pack
8 Pin
N–Pack
8 Pin
D–8
8 Pin
D–14
14 Pin
Order Information
Temp.
Range
-55 to +125°C
-25 to +85°C
0 to +70°C
-55 to +125°C
-25 to +85°C
0 to +70°C
Note:
To order, add the package identifier to the
part number.
eg.
IP1844AD–14
IP3845AJ
ABSOLUTE MAXIMUM RATINGS
(T
case
= 25°C unless otherwise stated)
V
CC
I
O
Supply Voltage
Output Current
Output Energy
Analog Inputs
Error Amp Output Sink Current
Power Dissipation
Derate @ T
amb
> 50°C
Power Dissipation
Derate @ T
amb
> 50°C
Power Dissipation
Derate @ T
case
> 25°C
Storage Temperature Range
Lead Temperature
(low impedance source)
(I
CC
< 30mA)
(capacitive load)
(pins 2 and 3)
T
amb
= 25°C
T
case
= 25°C
T
case
= 25°C
J, N Packages
D Package
J, N Packages
+30V
Self limiting
±1A
5µJ
–0.3V to +V
CC
10mA
1W
10mW/°C
725mW
7.25mW/°C
2W
16mW/°C
–65 to 150°C
+300°C
Prelim. 2/95
P
D
P
D
P
D
T
STG
T
L
(soldering, 10 seconds)
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.

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IP1845A IP1844A IP2845A IP2844A IP3844A IP3845A
Description CURRENT MODE REGULATING PULSE WIDTH MODULATORS CURRENT MODE REGULATING PULSE WIDTH MODULATORS CURRENT MODE REGULATING PULSE WIDTH MODULATORS CURRENT MODE REGULATING PULSE WIDTH MODULATORS CURRENT MODE REGULATING PULSE WIDTH MODULATORS CURRENT MODE REGULATING PULSE WIDTH MODULATORS
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