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IP2844

Seme LAB
Part Number IP2844
Manufacturer Seme LAB
Description CURRENT MODE REGULATING PULSE WIDTH MODULATORS
Published Apr 5, 2005
Detailed Description LAB TOP VIEW COMP 1 V FB 2 I SENSE 3 R T /C T 4 8 7 6 5 SEME IP1844 SERIES IP1845 SERIES VREF VCC OUTPUT GROUND CURR...
Datasheet PDF File IP2844 PDF File

IP2844
IP2844

Overview
LAB TOP VIEW COMP 1 V FB 2 I SENSE 3 R T /C T 4 8 7 6 5 SEME IP1844 SERIES IP1845 SERIES VREF VCC OUTPUT GROUND CURRENT MODE REGULATING PULSE WIDTH MODULATORS FEATURES • • • • • Guaranteed ±1% reference voltage tolerance Guaranteed ±10% frequency tolerance Low start–up current (<500 mA) Under voltage lockout with hysteresis Output state completely defined for all supply and input conditions • Interchangeable with UC1844 and UC1845 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 VREF N/C VCC VC 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 Order Information Part Number IP1844 IP2844 IP3844 IP1845 IP2845 IP3845 J–Pack 8 Pin N–Pack 8 Pin D–8 8 Pin D–14 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.
IP1844D–14 IP3845J ABSOLUTE MAXIMUM RATINGS (Tcase = 25°C unless otherwise stated) VCC IO Supply Voltage Output Current Output Energy Analog Inputs Error Amp Output Sink Current Power Dissipation Derate @ Tamb > 50°C Power Dissipation Derate @ Tamb > 50°C Power Dissipation Derate @ Tcase > 25°C Storage Temperature Range Lead Temperature (low impedance source) (ICC < 30mA) (capacitive load) (pins 2 and 3) Tamb = 25°C Tcase = 25°C Tcase = 25°C J, N Packages D Package J, N Packages +30V Self limiting ±1A 5µJ –0.
3V to +VCC 10mA 1W 10mW/°C 725mW 7.
25mW/°C 2W 16mW/°C –65 to 150°C +300°C Prelim.
2/95 PD PD PD TSTG TL (soldering, 10 seconds) Semelab plc.
Telephone (01455) 556565.
Telex: 341927.
Fax (01455) 552612.
LAB DESCRIPTION SEME IP1844 SERIES IP1845 SERIES The IP1844 and IP1845 series of switching regulator control circuits contain all the functions necessary to implement off-line, current mode switching regula...


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