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IP3842 Dataheets PDF



Part Number IP3842
Manufacturers Seme LAB
Logo Seme LAB
Description CURRENT MODE REGULATING PULSE WIDTH MODULATORS
Datasheet IP3842 DatasheetIP3842 Datasheet (PDF)

IP1842 SERIES IP1843 SERIES TOP VIEW COMP 1 V FB 2 I SENSE 3 R T /C T 4 8 7 6 5 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 UC1842 and UC1843 series for improved operation • 500kHz operation J Package – 8 Pin Cer.

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IP1842 SERIES IP1843 SERIES TOP VIEW COMP 1 V FB 2 I SENSE 3 R T /C T 4 8 7 6 5 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 UC1842 and UC1843 series for improved operation • 500kHz 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 IP1842 IP2842 IP3842 IP1843 IP2843 IP3843 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. IP1842J IP3843D-14 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 @ 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 +30V Self limiting ±1A 5mJ –0.3V to +VCC 10mA 1W 10mW/°C 2W 24mW/°C –65 to 150°C +300°C Prelim.3/00 PD PD TSTG TL (soldering, 10 seconds) Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: [email protected] Website: http://www.semelab.co.uk IP1842 SERIES IP1843 SERIES DESCRIPTION The IP1842 and IP1843 series of switching regulator control circuits contain all the functions necessary to implement off–line, current mode switching regulators, using a minimum number of external parts. Functions included are voltage reference, error amplifier, current sense comparator, oscillator, totem pole output driver and under-voltage lockout circuitry. Although pin compatible with the UC1842 and 1843 series, SEMELAB has incorporated several improvements in the IP1842 and IP1843 series allowing tighter and more complete specification of electrical performance. BLOCK DIAGRAM VCC 7/12 34V G ND 5/9 UNDER – VOLTAGE LOCKOUT ENABLE REFERENCE 5V REGULATOR INTERNAL BIAS 2.5V REG 8/14 VREF 16V (8.4V) 6V (0.5V) S R 3.6V R T /CT 4/7 VREF STATUS LATCH 7/11 VC 6/10 OSCILLATOR ERROR AMP OUTPUT 2R R 1V S R CURRENT SENSE COMPARATOR PWM LATCH 5/8 V FB C OMP I SENSE 2/3 POW ER GROUND 1/1 3/5 Values in brackets are for IP1843 series. PIN NUMBERS 1st Number – N, J and 8 Pin D Packages 2nd Num ber – 14 Pin D Package. RECOMMENDED OPERATING CONDITIONS VCC IO Supply Voltage 1 Output Current Analog Inputs (pins 2 and 3) IP1842 , IP1843 IP2842 , IP2843 IP3842 , IP3843 Error Amp Output Sink Current Operating Ambient Temperature Range £ 30V 0 to ±200mA –0.3V to 3V 0 to 2mA –55 to 125°C –25 to 85°C 0 to 70°C Notes: 1. Lower limit set by under voltage lockout specification. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: [email protected] Website: http://www.semelab.co.uk Prelim.3/00 IP1842 SERIES IP1843 SERIES ELECTRICAL CHARACTERISTICS (Over Full Operating Temperature Range unless otherwise stated) IP1842/IP1843 IP2842/IP2843 Min. Typ. Max. TJ = 25°C Parameter Output Voltage Input Regulation Output Regulation Temperature Stability Total Output Variation Output Noise Voltage Long Term Stability Output Short Circuit Current Frequency Voltage stability Temperature Stability Amplitude Discharge Current Test Conditions REFERENCE SECTION IO = 1mA VCC = 12V to 25V IO = 1mA to 20mA Min. 4.90 IP3842 IP3843 Typ. 5.00 6 6 0.2 Max. Units 5.10 20 25 0.4 5.18 V mV mV °C V m 4.95 5.00 6 6 0.2 5.05 20 25 0.4 5.10 Line, Load, Temp f = 10Hz to 10kHz TJ = 25°C TJ = 125°C @ 1000Hrs VREF = 0 4.90 50 5 30 80 4.82 50 5 30 80 V 25 160 25 160 mV mA OSCILLATOR SECTION TJ = 25°C VCC = 12V to 25V D 47 52 0.2 5 1.7 8.3 8 57 1 47 52 0.2 5 1.7 8.3 8 57 1 kHz % % V mA % TA = Min to Max VPIN4 Peak to Peak TJ = 25°C D TA = Min to Max ERROR AMP SECTION Input Voltage Input Bias Current Open Loop Voltage Gain Unity Gain Bandwidth Supply Voltage Rejection Output Sink Current Output Source Current VOUT High VOUT Low VCC = 12V to 25V VPIN2 = 2.7V VPIN2 = 2.3V VPIN2 = 2.3V VPIN2 = 2.7V VPIN1 = 1.1V VPIN1 = 4.6V RL = 15kW RL = 15kW VO = 2V to 4V VPIN1 = 2.5V 2.45 2.50 –0.3 2.55 –1 2.42 2.50 –0.3 2.58 –2 V m A 65 0.7 60 2 –0.5 4.6 90 1 70 6 –0.8 4.8 0.7 1.1 65 0.7 60 2 –0.5 4.6 90 1 70 6 –0.8 4.8 0.7 1.1 dB MHz dB mA V NOTES 1. Test Conditions unless otherwise stated: VCC = 15V* , RT = 10kW , CT = 3.3nF , f = 52kHz. *Adjust VCC above start threshold before setting at required level. All specifications apply over the full operating temperatu.


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