UC3843D

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Texas Instruments

SINGLE ENDED 500KHZ CURRENT MODE PWM CONTROLLER WITH 8.4V/7.6V UVLO 100% DUTY CYCLE, 0C TO 70C

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Search across all available documentation for this part.

DocumentsConditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A)Understanding Buck Power Stages In Switchmode Power Supplies +14

UC3843D

Active

Texas Instruments

SINGLE ENDED 500KHZ CURRENT MODE PWM CONTROLLER WITH 8.4V/7.6V UVLO 100% DUTY CYCLE, 0C TO 70C

Deep-Dive with AI

DocumentsConditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A)Understanding Buck Power Stages In Switchmode Power Supplies +14

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	UC3843D

Mounting Type	Surface Mount
Operating Temperature [Max]	70 °C
Operating Temperature [Min]	0 °C
Package / Case	14-SOIC
Package / Case [x]	0.154 in
Package / Case [y]	3.9 mm

UC3843A Series

30-V, 1A, 500KHz current mode PWM controller with 8.4V/7.6V UVLO 100% duty cycle 0°C to 70°C

Part	Applications	Current - Supply	Package / Case [x]	Package / Case [y]	Package / Case	Operating Temperature [Max]	Voltage - Supply [Max]	Voltage - Supply [Min]	Mounting Type	Voltage - Input [Min]	Voltage - Input [Max]	Supplier Device Package	Package / Case	Package / Case	Duty Cycle (Max) [Max]	Number of Outputs	Output Configuration	Topology	Output Type	Output Phases	Function	Control Features
Texas Instruments UC3843ADTR	PWM Controller	11 mA	0.154 in	3.9 mm	14-SOIC	70 °C	30 VDC	7.6 V	Surface Mount	-3 V	6.3 V
Texas Instruments UC3843D8	PWM Controller	11 mA	0.154 in	3.9 mm	8-SOIC	70 °C	28 V	12 V	Surface Mount	-3 V	6.3 V	8-SOIC
Texas Instruments UC3843NG4	PWM Controller	11 mA			8-DIP	70 °C	28 V	12 V	Through Hole	-3 V	6.3 V	8-PDIP	0.3 in	7.62 mm
Texas Instruments UC3843AD	PWM Controller	11 mA	0.154 in	3.9 mm	14-SOIC	70 °C	30 VDC	7.6 V	Surface Mount	-3 V	6.3 V
Texas Instruments UC3843D			0.154 in	3.9 mm	14-SOIC	70 °C			Surface Mount
Texas Instruments UC3843DR-8			0.154 in	3.9 mm	8-SOIC	70 °C			Surface Mount			8-SOIC			97 %	1	Isolation Capable Positive	Boost Buck Buck-Boost Flyback Forward	Transistor Driver	1	Step-Down Step-Up Step-Up/Step-Down	Frequency Control
Texas Instruments UC3843ANG4	PWM Controller	11 mA			8-DIP	70 °C	30 VDC	7.6 V	Through Hole	-3 V	6.3 V	8-PDIP	0.3 in	7.62 mm
Texas Instruments UC3843AD8TR	PWM Controller	11 mA	0.154 in	3.9 mm	8-SOIC	70 °C	30 VDC	7.6 V	Surface Mount	-3 V	6.3 V	8-SOIC
Texas Instruments UC3843D8TR	PWM Controller	11 mA	0.154 in	3.9 mm	8-SOIC	70 °C	28 V	12 V	Surface Mount	-3 V	6.3 V	8-SOIC
Texas Instruments UC3843AD8	PWM Controller	11 mA	0.154 in	3.9 mm	8-SOIC	70 °C	30 VDC	7.6 V	Surface Mount	-3 V	6.3 V	8-SOIC

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 1.57
		10	$ 1.40
		50	$ 1.33
		100	$ 1.09
		250	$ 1.02
		500	$ 0.90
		1000	$ 0.71
		2500	$ 0.66
		5000	$ 0.63
Texas Instruments	TUBE	1	$ 1.28
		100	$ 0.98
		250	$ 0.72
		1000	$ 0.52

Description

General part information

UC3843A Series

The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control current-mode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5mA, oscillator discharge is trimmed to 8.3mA, and during UVLO, the output stage can sink at least 10mA at less than 1.2V for VCC over 5V.

Documents

Technical documentation and resources

Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A)

Application note

Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B)

Application note

DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit

Application note

UCx84x Current-Mode PWM Controllers datasheet (Rev. H)

Data sheet

DN-27 UC1842/UC1842A Family - Summary of Functional Differences

Application note

U-111, Practical Considerations in Current Mode Power Supplies

Application note

UC3843D

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UC3843D

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Technical Specifications

UC3843A Series

Pricing

Description

UC3843A Series

Documents

Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A)

Understanding Buck Power Stages In Switchmode Power Supplies

Understanding Boost Power Stages In Switchmode Power Supplies

DN-65 Considerations in Powering BiCMOS ICs

DN-43 Simple Techniques to Generate a Negative Voltage Bias Supply

Power Management Guide 2018 (Rev. R)

When should you use PWM controllers?

DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty

UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers

U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control

DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802

Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B)

DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit

UCx84x Current-Mode PWM Controllers datasheet (Rev. H)

DN-27 UC1842/UC1842A Family - Summary of Functional Differences

U-111, Practical Considerations in Current Mode Power Supplies

UC3843A Series