UC2843 data sheet, product information and support (2024)

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Power management

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30-V, 1-A, 500KHz current mode PWM controller with 8.4V/7.6V UVLO 100% duty cycle, -40C to 85C

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Data sheet

document-pdfAcrobat UCx84x Current-Mode PWM Controllers datasheet (Rev. G) PDF | HTML

UC2843

ACTIVE

Product details

Vin (max) (V) 28 Operating temperature range (°C) -40 to 85 Control mode Peak current mode Topology Boost, Buck, Buck boost, Flyback, Forward Rating Catalog Features Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 100

PDIP (P)

92.5083 mm² 9.81 x 9.43

SOIC (D)

51.9 mm² 8.65 x 6

SOIC (D)

29.4 mm² 4.9 x 6

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
Internally trimmed bandgap reference
Up to 500-kHz operation
Error amplifier with low output resistance

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
Internally trimmed bandgap reference
Up to 500-kHz operation
Error amplifier with low output resistance

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis 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 for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

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Technical documentation

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	Type	Title		Date
*	Data sheet	UCx84x Current-Mode PWM Controllers datasheet (Rev. G)	PDF \| HTML	11 Jul 2022
	Application note	Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A)	PDF \| HTML	11 Jun 2021
	Application note	Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B)		12 Mar 2019
	Selection guide	Power Management Guide 2018 (Rev. R)		25 Jun 2018
	Application note	UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers		07 Feb 2002
	Application note	DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit		05 Sep 1999
	Application note	DN-27 UC1842/UC1842A Family - Summary of Functional Differences		05 Sep 1999
	Application note	DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty		05 Sep 1999
	Application note	DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802		05 Sep 1999
	Application note	DN-65 Considerations in Powering BiCMOS ICs		05 Sep 1999
	Application note	U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control		05 Sep 1999
	Application note	U-111, Practical Considerations in Current Mode Power Supplies		05 Sep 1999
	Application note	Understanding Boost Power Stages In Switchmode Power Supplies		04 Mar 1999
	Application note	Understanding Buck Power Stages In Switchmode Power Supplies		04 Mar 1999

Design & development

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Simulation model

UCC28C43 PSpice Transient Model

SLUM033.ZIP (101 KB) - PSpice Model

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Simulation model

UCCx8C43 Unencrypted PSpice Transient Model

SLUM521.ZIP (4 KB) - PSpice Model

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Package	Pins	CAD symbols, footprints & 3D models
PDIP (P)	8	Ultra Librarian
SOIC (D)	14	Ultra Librarian
SOIC (D)	8	Ultra Librarian

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Information included:

RoHS
REACH
Device marking
Lead finish/Ball material
MSL rating/Peak reflow
MTBF/FIT estimates
Material content
Qualification summary
Ongoing reliability monitoring

Information included:

Fab location
Assembly location

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