UC2846 Series

Dual ended 500KHz current mode PWM controller, -40C to 85C

Catalog(4 parts)

Part	Topology	Output Phases▲▼	Control Features	Operating Temperature▲▼	Operating Temperature▲▼	Output Configuration	Voltage - Supply (Vcc/Vdd)▲▼	Voltage - Supply (Vcc/Vdd)▲▼	Frequency - Switching▲▼	Function	Package / Case	Output Type	Mounting Type	Number of Outputs▲▼	Supplier Device Package	Duty Cycle (Max)▲▼
Texas Instruments UC2846DWTR 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	1 ul	Current Limit, Enable, Frequency Control, Soft Start	85 °C	-40 °C	Positive	40 V	6.949999809265137 V	500000 Hz	Step-Up, Step-Up/Step-Down	16-SOIC	Transistor Driver	Surface Mount	2 ul	16-SOIC	0.5 ul
Texas Instruments UC2846QTR Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull Regulator Positive Output Step-Up, Step-Up/Step-Down DC-DC Controller IC 20-PLCC (9x9)	Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull	1 ul	Current Limit, Enable, Frequency Control, Soft Start	85 °C	-40 °C	Positive	40 V	6.949999809265137 V	500000 Hz	Step-Up, Step-Up/Step-Down	20-LCC (J-Lead)	Transistor Driver	Surface Mount	2 ul	20-PLCC (9x9)	0.5 ul
Texas Instruments UC2846DW 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	1 ul	Current Limit, Enable, Frequency Control, Soft Start	85 °C	-40 °C	Positive	40 V	6.949999809265137 V	500000 Hz	Step-Up, Step-Up/Step-Down	16-SOIC	Transistor Driver	Surface Mount	2 ul	16-SOIC	0.5 ul
Texas Instruments UC2846Q Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull Regulator Positive Output Step-Up, Step-Up/Step-Down DC-DC Controller IC 20-PLCC (9x9)	Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull	1 ul	Current Limit, Enable, Frequency Control, Soft Start	85 °C	-40 °C	Positive	40 V	6.949999809265137 V	500000 Hz	Step-Up, Step-Up/Step-Down	20-LCC (J-Lead)	Transistor Driver	Surface Mount	2 ul	20-PLCC (9x9)	0.5 ul

Key Features

• Automatic Feedforward CompensationProgrammable Pulse-by-Pulse Current LimitingAutomatic Symmetry Correction in Push-PullConfigurationEnhanced Load Response CharacteristicsParallel Operation Capability for Modular PowerSystemsDifferential Current Sense Amplifier with WideCommon Mode RangeDouble-Pulse Suppression500-mA (Peak) Totem-pole Outputs±1% Band Gap ReferenceUndervoltage LockoutSoft-Start CapabilityShutdown Terminal500-kHz OperationAutomatic Feedforward CompensationProgrammable Pulse-by-Pulse Current LimitingAutomatic Symmetry Correction in Push-PullConfigurationEnhanced Load Response CharacteristicsParallel Operation Capability for Modular PowerSystemsDifferential Current Sense Amplifier with WideCommon Mode RangeDouble-Pulse Suppression500-mA (Peak) Totem-pole Outputs±1% Band Gap ReferenceUndervoltage LockoutSoft-Start CapabilityShutdown Terminal500-kHz Operation

Description

The UC1846/7 family of control devices provides all of the necessary features to implement fixed-frequency, current-mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel while maintaining equal current sharing. \ Protection circuitry includes built-in undervoltage lockout and programmable current limit, in addition to soft-start capability. A shutdown function is also available, which can initiate either a complete shutdown with automatic restart or latch the supply off. Other features include fully-latched operation, double-pulse suppression, deadline adjust capability, and a ±1% trimmed band gap reference. The UC1846 features low outputs in the OFF state, while the UCx847 features high outputs in the OFF state. The UC1846/7 family of control devices provides all of the necessary features to implement fixed-frequency, current-mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel while maintaining equal current sharing. \ Protection circuitry includes built-in undervoltage lockout and programmable current limit, in addition to soft-start capability. A shutdown function is also available, which can initiate either a complete shutdown with automatic restart or latch the supply off. Other features include fully-latched operation, double-pulse suppression, deadline adjust capability, and a ±1% trimmed band gap reference. The UC1846 features low outputs in the OFF state, while the UCx847 features high outputs in the OFF state.