Details, datasheet, quote on part number: IP2843
PartIP2843
CategoryRF & Microwaves => Modulators
DescriptionCurrent Mode Regulating Pulse Width Modulators
CompanySemelab Plc
DatasheetDownload IP2843 datasheet
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Features, Applications

CURRENT MODE REGULATING PULSE WIDTH MODULATORS
FEATURES

Guaranteed ±1% reference voltage tolerance Guaranteed ±10% frequency tolerance Low start­up 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

Part Number IP2843 IP3843 J­Pack 8 Pin N­Pack 8 Pin D­8 8 Pin D­14 14 Pin Temp. Range 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 ­0.3V to +VCC 150°C +300°C

DESCRIPTION

The IP1842 and IP1843 series of switching regulator control circuits contain all the functions necessary to implement off­line, 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.

UNDER ­ VOLTAGE LOCKOUT ENABLE REFERENCE 5V REGULATOR INTERNAL BIAS 2.5V REG

VCC IO Supply Voltage 1 Output Current Analog Inputs (pins 2 and , IP3843 Error Amp Output Sink Current Operating Ambient Temperature Range

1. Lower limit set by under voltage lockout specification.
ELECTRICAL CHARACTERISTICS (Over Full Operating Temperature Range unless otherwise stated)

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

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 = 2.5V

1. Test Conditions unless otherwise stated: VCC = 52kHz. *Adjust VCC above start threshold before setting at required level. All specifications apply over the full operating temperature range unless otherwise stated. (See Ordering Information for further details).


 

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