UC2843N

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Texas Instruments

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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DocumentsUnderstanding Boost Power Stages In Switchmode Power Supplies Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B)+12

UC2843N

Active

Texas Instruments

30-V, 1-A, 500KHZ CURRENT MODE PWM CONTROLLER WITH 8.4V/7.6V UVLO 100% DUTY CYCLE, -40C TO 85C

Deep-Dive with AI

DocumentsUnderstanding Boost Power Stages In Switchmode Power Supplies Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B)+12

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics commom to parts in this series

Specification	UC2843N	UC2843 Series

Applications	PWM Controller	PWM Controller
Clock Sync	-	False
Control Features	-	Frequency Control
Current - Supply	11 mA	11 mA
Duty Cycle (Max)	-	96 - 97 %
Function	-	Step-Down, Step-Up/Step-Down, Step-Up
Grade	-	Automotive
Mounting Type	Through Hole	Surface Mount, Through Hole
Number of Outputs	-	1
Operating Temperature [Max]	85 °C	85 - 125 °C
Operating Temperature [Min]	-40 °C	-40 °C
Output Configuration	-	Positive, Isolation Capable
Output Phases	-	1
Output Type	-	Transistor Driver
Package / Case	8-DIP	16-SOIC, 20-LCC (J-Lead), 14-SOIC, 8-SOIC, 8-DIP
Package / Case	0.3 in	0.3 - 3.9 mm
Package / Case	7.62 mm	0.154 - 7.62 in
Package / Case	-	3.9 mm
Qualification	-	AEC-Q100
Supplier Device Package	8-PDIP	16-SOIC, 20-PLCC (9x9), 8-SOIC, 8-PDIP
Synchronous Rectifier	-	False
Topology	-	Buck, Forward, Boost, Flyback, Buck-Boost
Voltage - Input [Max]	6.3 V	6.3 V
Voltage - Input [Min]	-3 V	-3 V
Voltage - Supply (Vcc/Vdd)	-	28 - 30 V
Voltage - Supply (Vcc/Vdd)	-	7.6 - 12 V
Voltage - Supply [Max]	28 V	28 - 30 VDC
Voltage - Supply [Min]	12 V	7.6 - 12 V

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	$ 1.39
		10	$ 1.01
		50	$ 0.86
		100	$ 0.81
		250	$ 0.76
		500	$ 0.73
		1000	$ 0.71
		2500	$ 0.68
		5000	$ 0.67
Texas Instruments	TUBE	1	$ 1.20
		100	$ 0.92
		250	$ 0.68
		1000	$ 0.49

UC2843 Series

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

Part	Topology	Output Type	Number of Outputs	Package / Case	Function	Supplier Device Package	Output Phases	Operating Temperature [Max]	Operating Temperature [Min]	Duty Cycle (Max) [Max]	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Control Features	Mounting Type	Output Configuration	Current - Supply	Voltage - Supply [Max]	Voltage - Supply [Min]	Voltage - Input [Min]	Voltage - Input [Max]	Applications	Package / Case	Package / Case	Qualification	Grade	Package / Case
Texas Instruments UC2843ADW	Boost, Buck, Flyback, Forward	Transistor Driver	1	16-SOIC	Step-Down, Step-Up, Step-Up/Step-Down	16-SOIC	1	85 °C	-40 °C	96 %	30 V	7.6 V	Frequency Control	Surface Mount	Isolation Capable, Positive
Texas Instruments UC2843AQ				20-LCC (J-Lead)		20-PLCC (9x9)		125 °C	-40 °C					Surface Mount		11 mA	30 VDC	7.9 V	-3 V	6.3 V	PWM Controller
Texas Instruments UC2843DG4				14-SOIC				85 °C	-40 °C					Surface Mount		11 mA	28 V	12 V	-3 V	6.3 V	PWM Controller	3.9 mm	0.154 in
Texas Instruments UC2843ADG4				14-SOIC				85 °C	-40 °C					Surface Mount		11 mA	30 VDC	7.6 V	-3 V	6.3 V	PWM Controller	3.9 mm	0.154 in	AEC-Q100	Automotive
Texas Instruments UC2843D8TRG4				8-SOIC		8-SOIC		85 °C	-40 °C					Surface Mount		11 mA	28 V	12 V	-3 V	6.3 V	PWM Controller					3.9 mm
Texas Instruments UC2843AQD8R				8-SOIC		8-SOIC		125 °C	-40 °C					Surface Mount		11 mA	30 VDC	7.9 V	-3 V	6.3 V	PWM Controller					3.9 mm
Texas Instruments UC2843N				8-DIP		8-PDIP		85 °C	-40 °C					Through Hole		11 mA	28 V	12 V	-3 V	6.3 V	PWM Controller		7.62 mm			0.3 in
Texas Instruments UC2843P	Boost, Buck, Buck-Boost, Flyback, Forward	Transistor Driver	1	8-DIP	Step-Down, Step-Up, Step-Up/Step-Down	8-PDIP	1	85 °C	-40 °C	97 %	28 V	12 V	Frequency Control	Through Hole	Isolation Capable, Positive								7.62 mm			0.3 in
Texas Instruments UC2843AQDRHT	Boost, Buck, Flyback, Forward	Transistor Driver	1	14-SOIC	Step-Up		1	125 °C	-40 °C	96 %	30 V	7.6 V	Frequency Control	Surface Mount	Isolation Capable, Positive							3.9 mm	0.154 in	AEC-Q100	Automotive
Texas Instruments UC2843ANG4				8-DIP		8-PDIP		85 °C	-40 °C					Through Hole		11 mA	30 VDC	7.6 V	-3 V	6.3 V	PWM Controller		7.62 mm	AEC-Q100	Automotive	0.3 in
Texas Instruments UC2843D8G4				8-SOIC		8-SOIC		85 °C	-40 °C					Surface Mount		11 mA	28 V	12 V	-3 V	6.3 V	PWM Controller					3.9 mm
Texas Instruments UC2843AD8G4				8-SOIC		8-SOIC		85 °C	-40 °C					Surface Mount		11 mA	30 VDC	7.6 V	-3 V	6.3 V	PWM Controller			AEC-Q100	Automotive	3.9 mm
Texas Instruments UC2843AN				8-DIP		8-PDIP		85 °C	-40 °C					Through Hole		11 mA	30 VDC	7.6 V	-3 V	6.3 V	PWM Controller		7.62 mm	AEC-Q100	Automotive	0.3 in
Texas Instruments UC2843AQDR				14-SOIC				125 °C	-40 °C					Surface Mount		11 mA	30 VDC	7.9 V	-3 V	6.3 V	PWM Controller	3.9 mm	0.154 in
Texas Instruments UC2843ADTR				14-SOIC				85 °C	-40 °C					Surface Mount		11 mA	30 VDC	7.6 V	-3 V	6.3 V	PWM Controller	3.9 mm	0.154 in	AEC-Q100	Automotive
Texas Instruments UC2843AD8TR				8-SOIC		8-SOIC		85 °C	-40 °C					Surface Mount		11 mA	30 VDC	7.6 V	-3 V	6.3 V	PWM Controller			AEC-Q100	Automotive	3.9 mm
Texas Instruments UC2843D8TR				8-SOIC		8-SOIC		85 °C	-40 °C					Surface Mount		11 mA	28 V	12 V	-3 V	6.3 V	PWM Controller					3.9 mm
Texas Instruments UC2843NG4				8-DIP		8-PDIP		85 °C	-40 °C					Through Hole		11 mA	28 V	12 V	-3 V	6.3 V	PWM Controller		7.62 mm			0.3 in
Texas Instruments UC2843DTR				14-SOIC				85 °C	-40 °C					Surface Mount		11 mA	28 V	12 V	-3 V	6.3 V	PWM Controller	3.9 mm	0.154 in
Texas Instruments UC2843AD8TRG4				8-SOIC		8-SOIC		85 °C	-40 °C					Surface Mount		11 mA	30 VDC	7.6 V	-3 V	6.3 V	PWM Controller			AEC-Q100	Automotive	3.9 mm
Texas Instruments UC2843AQD8RQ1				8-SOIC		8-SOIC		125 °C	-40 °C					Surface Mount		11 mA	30 VDC	7.9 V	-3 V	6.3 V	PWM Controller					3.9 mm
Texas Instruments UC2843D				14-SOIC				85 °C	-40 °C					Surface Mount		11 mA	28 V	12 V	-3 V	6.3 V	PWM Controller	3.9 mm	0.154 in
Texas Instruments UC2843AD8				8-SOIC		8-SOIC		85 °C	-40 °C					Surface Mount		11 mA	30 VDC	7.6 V	-3 V	6.3 V	PWM Controller			AEC-Q100	Automotive	3.9 mm
Texas Instruments UC2843AQD				14-SOIC				125 °C	-40 °C					Surface Mount		11 mA	30 VDC	7.9 V	-3 V	6.3 V	PWM Controller	3.9 mm	0.154 in

Description

General part information

UC2843 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.