UC2843 Series

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

Catalog(16 parts)

Part	Package / Case▲▼	Package / Case▲▼	Package / Case	Operating Temperature▲▼	Operating Temperature▲▼	Mounting Type	Voltage - Supply▲▼	Voltage - Supply▲▼	Voltage - Input▲▼	Voltage - Input▲▼	Grade	Current - Supply▲▼	Qualification	Applications	Supplier Device Package	Package / Case▲▼	Output Phases▲▼	Topology	Output Type	Number of Outputs▲▼	Function	Output Configuration	Control Features	Voltage - Supply (Vcc/Vdd)▲▼	Voltage - Supply (Vcc/Vdd)▲▼	Duty Cycle (Max)▲▼
Texas Instruments UC2843ADTR Power Supply Controller PWM Controller 14-SOIC	0.003899999894201755 m	0.003911599982529879 m	14-SOIC	85 °C	-40 °C	Surface Mount	30 V	7.599999904632568 V	-3 V	6.300000190734863 V	Automotive	0.010999999940395355 A	AEC-Q100	PWM Controller
Texas Instruments UC2843AD8TR Power Supply Controller PWM Controller 8-SOIC			8-SOIC	85 °C	-40 °C	Surface Mount	30 V	7.599999904632568 V	-3 V	6.300000190734863 V	Automotive	0.010999999940395355 A	AEC-Q100	PWM Controller	8-SOIC	0.003899999894201755 m
Texas Instruments UC2843D Power Supply Controller PWM Controller 14-SOIC	0.003899999894201755 m	0.003911599982529879 m	14-SOIC	85 °C	-40 °C	Surface Mount	28 V	12 V	-3 V	6.300000190734863 V		0.010999999940395355 A		PWM Controller
Texas Instruments UC2843D8TR Power Supply Controller PWM Controller 8-SOIC			8-SOIC	85 °C	-40 °C	Surface Mount	28 V	12 V	-3 V	6.300000190734863 V		0.010999999940395355 A		PWM Controller	8-SOIC	0.003899999894201755 m
Texas Instruments UC2843AQD8R Power Supply Controller PWM Controller 8-SOIC			8-SOIC	125 °C	-40 °C	Surface Mount	30 V	7.900000095367432 V	-3 V	6.300000190734863 V		0.010999999940395355 A		PWM Controller	8-SOIC	0.003899999894201755 m
Texas Instruments UC2843AQD8RQ1 Power Supply Controller PWM Controller 8-SOIC			8-SOIC	125 °C	-40 °C	Surface Mount	30 V	7.900000095367432 V	-3 V	6.300000190734863 V		0.010999999940395355 A		PWM Controller	8-SOIC	0.003899999894201755 m
Texas Instruments UC2843AD8TRG4 Power Supply Controller PWM Controller 8-SOIC			8-SOIC	85 °C	-40 °C	Surface Mount	30 V	7.599999904632568 V	-3 V	6.300000190734863 V	Automotive	0.010999999940395355 A	AEC-Q100	PWM Controller	8-SOIC	0.003899999894201755 m
Texas Instruments UC2843D8G4 Power Supply Controller PWM Controller 8-SOIC			8-SOIC	85 °C	-40 °C	Surface Mount	28 V	12 V	-3 V	6.300000190734863 V		0.010999999940395355 A		PWM Controller	8-SOIC	0.003899999894201755 m
Texas Instruments UC2843D8TRG4 Power Supply Controller PWM Controller 8-SOIC			8-SOIC	85 °C	-40 °C	Surface Mount	28 V	12 V	-3 V	6.300000190734863 V		0.010999999940395355 A		PWM Controller	8-SOIC	0.003899999894201755 m
Texas Instruments UC2843AQ Power Supply Controller PWM Controller 20-PLCC (9x9)			20-LCC (J-Lead)	125 °C	-40 °C	Surface Mount	30 V	7.900000095367432 V	-3 V	6.300000190734863 V		0.010999999940395355 A		PWM Controller	20-PLCC (9x9)
Texas Instruments UC2843AD8 Power Supply Controller PWM Controller 8-SOIC			8-SOIC	85 °C	-40 °C	Surface Mount	30 V	7.599999904632568 V	-3 V	6.300000190734863 V	Automotive	0.010999999940395355 A	AEC-Q100	PWM Controller	8-SOIC	0.003899999894201755 m
Texas Instruments UC2843P Boost, Buck, Buck-Boost, Flyback, Forward Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 8-PDIP		0.007619999814778566 m	8-DIP	85 °C	-40 °C	Through Hole									8-PDIP	0.007619999814778566 m	1 ul	Boost, Buck, Buck-Boost, Flyback, Forward	Transistor Driver	1 ul	Step-Down, Step-Up, Step-Up/Step-Down	Isolation Capable, Positive	Frequency Control	12 V	28 V	0.9700000286102296 ul
Texas Instruments UC2843NG4 Power Supply Controller PWM Controller 8-PDIP		0.007619999814778566 m	8-DIP	85 °C	-40 °C	Through Hole	28 V	12 V	-3 V	6.300000190734863 V		0.010999999940395355 A		PWM Controller	8-PDIP	0.007619999814778566 m
Texas Instruments UC2843ANG4 Power Supply Controller PWM Controller 8-PDIP		0.007619999814778566 m	8-DIP	85 °C	-40 °C	Through Hole	30 V	7.599999904632568 V	-3 V	6.300000190734863 V	Automotive	0.010999999940395355 A	AEC-Q100	PWM Controller	8-PDIP	0.007619999814778566 m
Texas Instruments UC2843ADW Boost, Buck, Flyback, Forward Regulator Positive, Isolation Capable Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 16-SOIC			16-SOIC	85 °C	-40 °C	Surface Mount									16-SOIC		1 ul	Boost, Buck, Flyback, Forward	Transistor Driver	1 ul	Step-Down, Step-Up, Step-Up/Step-Down	Isolation Capable, Positive	Frequency Control	7.599999904632568 V	30 V	0.959999978542328 ul
Texas Instruments UC2843AN Power Supply Controller PWM Controller 8-PDIP		0.007619999814778566 m	8-DIP	85 °C	-40 °C	Through Hole	30 V	7.599999904632568 V	-3 V	6.300000190734863 V	Automotive	0.010999999940395355 A	AEC-Q100	PWM Controller	8-PDIP	0.007619999814778566 m

Key Features

• Optimized for off-line and DC-to-DC convertersLow start-up current (< 1mA)Automatic feedforward compensationPulse-by-pulse current limitingEnhanced load-response characteristicsUndervoltage lockout with hysteresisDouble-pulse suppressionHigh-current totem-pole outputInternally trimmed bandgap referenceUp to 500kHz operationError amplifier with low output resistanceOptimized for off-line and DC-to-DC convertersLow start-up current (< 1mA)Automatic feedforward compensationPulse-by-pulse current limitingEnhanced load-response characteristicsUndervoltage lockout with hysteresisDouble-pulse suppressionHigh-current totem-pole outputInternally trimmed bandgap referenceUp to 500kHz operationError amplifier with low output resistance

Description

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 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to provide 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, designed for driving N-channel MOSFETs, is low when the output stage 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 good choices for off-line power supplies, while the devices with a narrower hysteresis range are designed 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. 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 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to provide 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, designed for driving N-channel MOSFETs, is low when the output stage 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 good choices for off-line power supplies, while the devices with a narrower hysteresis range are designed 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.