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IP1844A Datasheet, PDF (1/6 Pages) Seme LAB – CURRENT MODE REGULATING PULSE WIDTH MODULATORS | |||
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SEME
LAB
IP1844A SERIES
IP1845A SERIES
TOP VIEW
COMP 1
VFB 2
ISENSE 3
RT /CT 4
8 VREF
7 VCC
6 OUTPUT
5 GROUND
CURRENT MODE
REGULATING
PULSE WIDTH
MODULATORS
J Package â 8 Pin Ceramic DIP
N Package â 8 Pin Plastic DIP
D-8 Package â 8 Pin Plastic (150) SOIC
FEATURES
TOP VIEW
⢠Guaranteed ±1% reference voltage tolerance
COMP 1
N/C 2
VFB 3
14 VREF
13 N/C
12 VCC
⢠Accurate oscillator discharge current
⢠Guaranteed ±10% frequency tolerance
⢠Low startâup current (<500 mA)
⢠Under voltage lockout with hysteresis
N/C 4
11 VC
⢠Output state completely defined for all supply
ISENSE 5
10 OUTPUT
N/C 6
RT /CT 7
9 GROUND
POWER
8
GROUND
D-14 Package â 14 Pin Plastic (150) SOIC
and input conditions
⢠Interchangeable with IP and UC1844/5 series for
improved operation
⢠500kHz Oscillator operation
250kHz Output operation
Order Information
Part
Number
IP1844A
IP2844A
IP3844A
IP1845A
IP2845A
IP3845A
JâPack NâPack
8 Pin
8 Pin
Dâ8
8 Pin
Dâ14
14 Pin
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. IP1844ADâ14
IP3845AJ
ABSOLUTE MAXIMUM RATINGS (Tcase = 25°C unless otherwise stated)
VCC
Supply Voltage
(low impedance source)
(ICC < 30mA)
+30V
Self limiting
IO
Output Current
±1A
Output Energy
(capacitive load)
5µJ
Analog Inputs
(pins 2 and 3)
Error Amp Output Sink Current
â0.3V to +VCC
10mA
PD
PD
PD
TSTG
TL
Power Dissipation
Derate @ Tamb > 50°C
Power Dissipation
Derate @ Tamb > 50°C
Power Dissipation
Derate @ Tcase > 25°C
Storage Temperature Range
Lead Temperature
Tamb = 25°C
Tcase = 25°C
Tcase = 25°C
J, N Packages
D Package
J, N Packages
(soldering, 10 seconds)
1W
10mW/°C
725mW
7.25mW/°C
2W
16mW/°C
â65 to 150°C
+300°C
Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
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