UC3844A Series

Single ended 500KHz current mode PWM controller with 16V/10V UVLO 50% duty cycle, 0C to 70C

Catalog

Single ended 500KHz current mode PWM controller with 16V/10V UVLO 50% duty cycle, 0C to 70C

Part	Package / Case [x]	Package / Case [y]	Package / Case	Applications	Current - Supply	Mounting Type	Voltage - Input [Min]	Voltage - Input [Max]	Voltage - Supply [Max]	Voltage - Supply [Min]	Operating Temperature [Max]	Package / Case	Package / Case	Supplier Device Package
Texas Instruments UC3844DTR	0.154 in	3.9 mm	14-SOIC	PWM Controller	11 mA	Surface Mount	-3 V	6.3 V	28 V	12 V	70 °C
Texas Instruments UC3844AN			8-DIP			Through Hole					70 °C	0.3 in	7.62 mm	8-PDIP
Texas Instruments UC3844AD8	0.154 in	3.9 mm	8-SOIC	PWM Controller	11 mA	Surface Mount	-3 V	6.3 V	30 VDC	10 VDC	70 °C			8-SOIC
Texas Instruments UC3844AD8G4	0.154 in	3.9 mm	8-SOIC	PWM Controller	11 mA	Surface Mount	-3 V	6.3 V	30 VDC	10 VDC	70 °C			8-SOIC
Texas Instruments UC3844D	0.154 in	3.9 mm	14-SOIC	PWM Controller	11 mA	Surface Mount	-3 V	6.3 V	28 V	12 V	70 °C
Texas Instruments UC3844AD8TRG4	0.154 in	3.9 mm	8-SOIC	PWM Controller	11 mA	Surface Mount	-3 V	6.3 V	30 VDC	10 VDC	70 °C			8-SOIC
Texas Instruments UC3844ADTR	0.154 in	3.9 mm	14-SOIC	PWM Controller	11 mA	Surface Mount	-3 V	6.3 V	30 VDC	10 VDC	70 °C
Texas Instruments UC3844D8TRG4	0.154 in	3.9 mm	8-SOIC	PWM Controller	11 mA	Surface Mount	-3 V	6.3 V	28 V	12 V	70 °C			8-SOIC
Texas Instruments UC3844AD	0.154 in	3.9 mm	14-SOIC	PWM Controller	11 mA	Surface Mount	-3 V	6.3 V	30 VDC	10 VDC	70 °C
Texas Instruments UC3844D8TR	0.154 in	3.9 mm	8-SOIC	PWM Controller	11 mA	Surface Mount	-3 V	6.3 V	28 V	12 V	70 °C			8-SOIC

Catalog

Single ended 500KHz current mode PWM controller with 16V/10V UVLO 50% duty cycle, 0C to 70C

Key Features

• Optimized for Off-Line and DC-DC ConvertersLow Start-Up Current (< 0.5mA)Trimmed Oscillator Discharge CurrentAutomatic Feedforward CompensationPulse-by-Pulse Current LimitingEnhanced Load Response CharacteristicsUndervoltage Lockout With HysteresisDouble Pulse SuppressionHigh-Current Totem Pole OutputInternally-Trimmed Bandgap ReferenceUp to 500kHz OperationCreate a Custom Design Using the UCx84xA With theWEBENCH Power DesignerOptimized for Off-Line and DC-DC ConvertersLow Start-Up Current (< 0.5mA)Trimmed Oscillator Discharge CurrentAutomatic Feedforward CompensationPulse-by-Pulse Current LimitingEnhanced Load Response CharacteristicsUndervoltage Lockout With HysteresisDouble Pulse SuppressionHigh-Current Totem Pole OutputInternally-Trimmed Bandgap ReferenceUp to 500kHz OperationCreate a Custom Design Using the UCx84xA With theWEBENCH Power Designer

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.