Details, datasheet, quote on part number: IP2845A
PartIP2845A
CategoryRF & Microwaves => Modulators
DescriptionCurrent Mode Regulating Pulse Width Modulators
CompanySemelab Plc
DatasheetDownload IP2845A datasheet
  

 

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 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

Part Number IP2845 IP3845 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. IP1844D­14 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 J, N Packages D Package J, N Packages +30V Self limiting ­0.3V to +VCC 150°C +300°C

DESCRIPTION

The IP1844 and IP1845 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. In addition there is a toggle flip-flop which blanks the output on every second clock pulse, thereby ensuring that the duty cycle never exceeds 50%. Although pin compatible with the UC1844 and UC1845 series, SEMELAB has incorporated several improvements in the IP1844 and IP1845 series allowing tighter and more complete specification of electrical performance.

UNDER­VOLTAGE LOCKOUT ENABLE REFERENCE 5V REGULATOR INTERNAL BIAS 2.5V REG
OSCILLATOR Q T ERROR AMP R 1V CURRENT SENSE COMPARATOR PWM LATCH TOGGLE FLIP FLOP

Values in brackets are for IP1845 series. PIN NUMBERS 1st Number N, J and 8 Pin D Packages 2nd Num ber ­ 14 Pin D Package.

VCC IO Supply Voltage Output Current Analog Inputs (pins 2 and , IP3845 Error Amp Output Sink Current Operating Ambient Temperature Range to 70°C

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 Line, Load, Temp @ 1000Hrs VREF = 0

ELECTRICAL CHARACTERISTICS (Over Full Operating Temperature Range unless otherwise stated)

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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