UC3879 Series

Enhanced bipolar phase shifted full bridge controller with selectable UVLO, 0°C to 70°C

Catalog(4 parts)

Part	Package / Case▲▼	Package / Case	Mounting Type	Voltage - Supply (Vcc/Vdd)▲▼	Voltage - Supply (Vcc/Vdd)▲▼	Topology	Operating Temperature▲▼	Output Type	Number of Outputs▲▼	Control Features	Function	Supplier Device Package	Output Configuration	Duty Cycle (Max)▲▼	Frequency - Switching▲▼	Output Phases▲▼	Package / Case▲▼	Package / Case▲▼
Texas Instruments UC3879DW Half-Bridge Regulator Positive Output Step-Up/Step-Down DC-DC Controller IC 20-SOIC	0.007493000011891127 m, 0.007499999832361937 m	20-SOIC	Surface Mount	9 V	20 V	Half-Bridge	70 °C	Transistor Driver	4 ul	Frequency Control, Ramp, Soft Start	Step-Up/Step-Down	20-SOIC	Positive	0.5 ul	300000 Hz	1 ul
Texas Instruments UC3879DWTR Half-Bridge Regulator Positive Output Step-Up/Step-Down DC-DC Controller IC 20-SOIC	0.007493000011891127 m, 0.007499999832361937 m	20-SOIC	Surface Mount	9 V	20 V	Half-Bridge	70 °C	Transistor Driver	4 ul	Frequency Control, Ramp, Soft Start	Step-Up/Step-Down	20-SOIC	Positive	0.5 ul	300000 Hz	1 ul
Texas Instruments UC3879N Half-Bridge Regulator Positive Output Step-Up/Step-Down DC-DC Controller IC 20-PDIP		20-DIP	Through Hole	9 V	20 V	Half-Bridge	70 °C	Transistor Driver	4 ul	Frequency Control, Ramp, Soft Start	Step-Up/Step-Down	20-PDIP	Positive	0.5 ul	300000 Hz	1 ul	0.007619999814778566 m	0.007619999814778566 m
Texas Instruments UC3879DWG4 Half-Bridge Regulator Positive Output Step-Up/Step-Down DC-DC Controller IC 20-SOIC	0.007493000011891127 m, 0.007499999832361937 m	20-SOIC	Surface Mount	9 V	20 V	Half-Bridge	70 °C	Transistor Driver	4 ul	Frequency Control, Ramp, Soft Start	Step-Up/Step-Down	20-SOIC	Positive	0.5 ul	300000 Hz	1 ul

Key Features

• Programmable Output Turn On Delay; Zero Delay AvailableCompatible with Voltage Mode or Current Mode TopologiesPractical Operation at Switching Frequencies to 300 kHz10-MHz Error AmplifierPin Programmable Undervoltage LockoutLow Startup Current — 150 µASoft Start ControlOutputs Active Low During UVLOProgrammable Output Turn On Delay; Zero Delay AvailableCompatible with Voltage Mode or Current Mode TopologiesPractical Operation at Switching Frequencies to 300 kHz10-MHz Error AmplifierPin Programmable Undervoltage LockoutLow Startup Current — 150 µASoft Start ControlOutputs Active Low During UVLO

Description

The UC3879 controls a bridge power stage by phase shifting the switching of one half-bridge with respect to the other. This allows constant frequency pulse width modulation in combination with resonant, zero-voltage switching for high efficiency performance. The UC3879 can be configured to provide control in either voltage mode or current mode operation, with overcurrent shutdown for fast fault protection. Independently programmable time delays provide dead-time at the turn-on of each output stage, allowing time for each resonant switching interval. With the oscillator capable of operating in excess of 600 kHz, overall output switching frequencies to 300 kHz are practical. In addition to the standard free running mode, with the CLKSYNC pin, the user may configure the UC3879 to accept an external clock synchronization signal. Alternatively, up to three units can be locked together with the operational frequency determined by the fastest device. Protective features include an undervoltage lockout and overcurrent protection. Additional features include a 10-MHz error amplifier, a 5-V precision reference, and soft start. The UC3879 is available in 20 pin N, J, DW, and Q and 28 pin L packages. The UC3879 controls a bridge power stage by phase shifting the switching of one half-bridge with respect to the other. This allows constant frequency pulse width modulation in combination with resonant, zero-voltage switching for high efficiency performance. The UC3879 can be configured to provide control in either voltage mode or current mode operation, with overcurrent shutdown for fast fault protection. Independently programmable time delays provide dead-time at the turn-on of each output stage, allowing time for each resonant switching interval. With the oscillator capable of operating in excess of 600 kHz, overall output switching frequencies to 300 kHz are practical. In addition to the standard free running mode, with the CLKSYNC pin, the user may configure the UC3879 to accept an external clock synchronization signal. Alternatively, up to three units can be locked together with the operational frequency determined by the fastest device. Protective features include an undervoltage lockout and overcurrent protection. Additional features include a 10-MHz error amplifier, a 5-V precision reference, and soft start. The UC3879 is available in 20 pin N, J, DW, and Q and 28 pin L packages.