UC3823 Series

30-V, 1.5A double ended 1MHz PWM controller with 9.2V/8.4V UVLO and 85% duty cycle , 0C to 70C

Catalog(9 parts)

Part	Topology	Output Configuration	Output Phases▲▼	Output Type	Package / Case	Duty Cycle (Max)▲▼	Supplier Device Package	Number of Outputs▲▼	Mounting Type	Voltage - Supply (Vcc/Vdd)▲▼	Voltage - Supply (Vcc/Vdd)▲▼	Control Features	Function	Frequency - Switching▲▼	Frequency - Switching▲▼	Operating Temperature▲▼	Operating Temperature▲▼	Voltage - Start Up▲▼	Fault Protection	Frequency - Switching▲▼	Duty Cycle▲▼	Output Isolation	Package / Case▲▼
Texas Instruments UC3823ADWTR Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull Regulator Positive Output Step-Up, Step-Up/Step-Down DC-DC Controller IC 16-SOIC	Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull	Positive	1 ul	Transistor Driver	16-SOIC	1 ul	16-SOIC	1 ul	Surface Mount	22 V	8.399999618530273 V	Current Limit, Frequency Control, Ramp, Soft Start	Step-Up, Step-Up/Step-Down	1000000 Hz	400000 Hz	70 °C	0 °C
Texas Instruments UC3823BDW Converter Offline Boost, Buck, Flyback, Forward Topology 1MHz 16-SOIC	Boost, Buck, Flyback, Forward				16-SOIC		16-SOIC		Surface Mount	22 V	10 V	Frequency Control, Soft Start				150 °C	-55 °C	16 V	Current Limiting	1000000 Hz	1 ul	Non-Isolated
Texas Instruments UC3823DW Converter Offline Boost, Buck, Flyback, Forward Topology 1MHz 16-SOIC	Boost, Buck, Flyback, Forward				16-SOIC		16-SOIC		Surface Mount	30 V	8.399999618530273 V	Frequency Control, Soft Start				70 °C	0 °C	9.199999809265137 V	Current Limiting	1000000 Hz	1 ul	Non-Isolated
Texas Instruments UC3823DWTR Converter Offline Boost, Buck, Flyback, Forward Topology 1MHz 16-SOIC	Boost, Buck, Flyback, Forward				16-SOIC		16-SOIC		Surface Mount	30 V	8.399999618530273 V	Frequency Control, Soft Start				70 °C	0 °C	9.199999809265137 V	Current Limiting	1000000 Hz	1 ul	Non-Isolated
Texas Instruments UC3823ADW Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull Regulator Positive Output Step-Up, Step-Up/Step-Down DC-DC Controller IC 16-SOIC	Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull	Positive	1 ul	Transistor Driver	16-SOIC	1 ul	16-SOIC	1 ul	Surface Mount	22 V	8.399999618530273 V	Current Limit, Frequency Control, Ramp, Soft Start	Step-Up, Step-Up/Step-Down	1000000 Hz	400000 Hz	70 °C	0 °C
Texas Instruments UC3823N Buck, Boost, Flyback, Forward Converter Regulator Positive Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 16-PDIP	Boost, Buck, Flyback, Forward Converter	Positive	1 ul	Transistor Driver	16-DIP		16-PDIP	1 ul	Through Hole	30 V	8.399999618530273 V	Current Limit, Enable, Frequency Control, Ramp, Soft Start	Step-Down, Step-Up, Step-Up/Step-Down	460000 Hz	340000 Hz	70 °C	0 °C						0.007619999814778566 m, 0.007619999814778566 m
Texas Instruments UC3823Q Buck, Boost, Flyback, Forward Converter Regulator Positive Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 20-PLCC (9x9)	Boost, Buck, Flyback, Forward Converter	Positive	1 ul	Transistor Driver	20-LCC (J-Lead)		20-PLCC (9x9)	1 ul	Surface Mount	30 V	8.399999618530273 V	Current Limit, Enable, Frequency Control, Ramp, Soft Start	Step-Down, Step-Up, Step-Up/Step-Down	460000 Hz	340000 Hz	70 °C	0 °C
Texas Instruments UC3823DWG4 Converter Offline Boost, Buck, Flyback, Forward Topology 1MHz 16-SOIC	Boost, Buck, Flyback, Forward				16-SOIC		16-SOIC		Surface Mount	30 V	8.399999618530273 V	Frequency Control, Soft Start				70 °C	0 °C	9.199999809265137 V	Current Limiting	1000000 Hz	1 ul	Non-Isolated
Texas Instruments UC3823BDWTR Converter Offline Boost, Buck, Flyback, Forward Topology 1MHz 16-SOIC	Boost, Buck, Flyback, Forward				16-SOIC		16-SOIC		Surface Mount	22 V	10 V	Frequency Control, Soft Start				150 °C	-55 °C	16 V	Current Limiting	1000000 Hz	1 ul	Non-Isolated

Key Features

• Compatible with Voltage or Current-Mode TopologiesPractical Operation @ Switching Frequencies to 1.0MHz50ns Propagation Delay to OutputHigh Current Totem Pole Output (1.5A peak)Wide Bandwidth Error AmplifierFully Latched Logic with Double Pulse SuppressionPulse-by-Pulse Current LimitingSoft Start/Max. Duty Cycle ControlUnder-Voltage Lockout with HysteresisLow Start Up Current (1.1mA)Trimmed Bandgap Reference (5.1V ±1%)Compatible with Voltage or Current-Mode TopologiesPractical Operation @ Switching Frequencies to 1.0MHz50ns Propagation Delay to OutputHigh Current Totem Pole Output (1.5A peak)Wide Bandwidth Error AmplifierFully Latched Logic with Double Pulse SuppressionPulse-by-Pulse Current LimitingSoft Start/Max. Duty Cycle ControlUnder-Voltage Lockout with HysteresisLow Start Up Current (1.1mA)Trimmed Bandgap Reference (5.1V ±1%)

Description

The UC1823 family of PWM control ICs is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage-mode systems with the capability for input voltage feed-forward. Protection circuitry includes a current limit comparator, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at the output. An under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the output is high impedance. The current limit reference (pin 11) is a DC input voltage to the current limit comparator. Consult specifications for details. These devices feature a totem pole output designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is defined as a high level. The UC1823 family of PWM control ICs is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage-mode systems with the capability for input voltage feed-forward. Protection circuitry includes a current limit comparator, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at the output. An under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the output is high impedance. The current limit reference (pin 11) is a DC input voltage to the current limit comparator. Consult specifications for details. These devices feature a totem pole output designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is defined as a high level.