UC1843J/883B

UC1843J/883B

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UC1843J/883B
CURRENT MODE PWM CONTROLLER
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$27.66

Quantity Available: 992
SZC Quality Assurance
Texas Instruments

Texas Instruments

Texas Instruments Incorporated (TI) is a global semiconductor powerhouse, crafts advanced analog ICs and embedded processors. Fueled by top-tier minds, TI's innovations drive tech's future, impacting 100,000+ clients.

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UC1843J/883B 1 Features


• Optimized for off-line and DC-to-DC converters
• Low start-up current (< 1 mA)
• Automatic feedforward compensation
• Pulse-by-pulse current limiting
• Enhanced load-response characteristics
• Undervoltage lockout with hysteresis
• Double-pulse suppression
• High-current totem-pole output

• Up to 500-kHz operation
• Error amplifier with low output resistanceInternally trimmed bandgap reference

UC1843J/883B 3 Description

internallyThe UCx84x series of control integrated circuitsprovide the features that are necessary to implementoff-line or DC-to-DC fixed-frequency current-modecontrol schemes, with a minimum number of externalimplemented circuitscomponents. Theinclude an undervoltage lockout (UVLO), featuring astart-up current of less than 1 mA, and a precisionreference trimmed for accuracy at the error amplifierinput. Other internal circuits include logic to ensurelatched operation, a pulse-width modulation (PWM)comparator that also provides current-limit control,and a totem-pole output stage that is designed tosource or sink high-peak current. The output stage,suitable for driving N-channel MOSFETs, is low whenit is in the off state.temperatureThe UCx84x family offers a variety of packageoptions,range options, choice ofmaximum duty cycle, and choice of turnon and turnoffthresholds and hysteresis ranges. Devices with higherturnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrowerhysteresis range are suited for DC-DC applications.The UC184x devices are specified for operation from–55°C to 125°C, the UC284x series is specified foroperation from –40°C to 85°C, and the UC384x seriesis specified for operation from 0°C to 70°C.Device Information(1)Simplified Application

UC1843J/883B 2 Applications


• Switching regulators of any polarity
• Transformer-coupled DC-DC converters

Product Attributes

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Supplier Device Package -
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Current - Supply -
Voltage - Supply -
Voltage - Input -
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Programmable Not Verified
Product Status Active
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$27.66

Quantity Available: 992
SZC Quality Assurance
Texas Instruments

Texas Instruments

Texas Instruments Incorporated (TI) is a global semiconductor powerhouse, crafts advanced analog ICs and embedded processors. Fueled by top-tier minds, TI's innovations drive tech's future, impacting 100,000+ clients.

View All Product from Texas Instruments
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