UC3879N

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Texas Instruments

ENHANCED BIPOLAR PHASE SHIFTED FULL BRIDGE CONTROLLER WITH SELECTABLE UVLO, 0°C TO 70°C

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UC3879N

Active

Texas Instruments

ENHANCED BIPOLAR PHASE SHIFTED FULL BRIDGE CONTROLLER WITH SELECTABLE UVLO, 0°C TO 70°C

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Description Specifications Series Pricing CAD Documents

Description

General part information

UC3879 Series

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.

Technical Specifications

Parameters and characteristics for this part

Specification	UC3879N

Clock Sync	Yes
Control Features	Soft Start, Frequency Control, Ramp
Duty Cycle (Max)	50 %
Frequency - Switching (Max)	300 kHz
Function	Step-Up, Step-Down
Mounting Type	Through Hole
Number of Outputs	4
Operating Temperature (Max)	70 °C
Operating Temperature (Min)	0 °C
Output Configuration	Positive
Output Phases	1
Output Type	Transistor Driver
Package Length	0.3 in
Package Name	20-PDIP, 20-DIP
Package Width	7.62 mm
Synchronous Rectifier	Yes
Topology	Half-Bridge
Voltage - Supply (Vcc/Vdd) Maximum	20 V
Voltage - Supply (Vcc/Vdd) Minimum	9 V

UC3879 Series

Part	Function	Output Phases	Duty Cycle (Max)	Synchronous Rectifier	Frequency - Switching (Max)	Control Features	Operating Temperature (Max)	Output Type	Clock Sync	Number of Outputs	Topology	Voltage - Supply (Vcc/Vdd) Maximum	Voltage - Supply (Vcc/Vdd) Minimum	Package Length	Package Name	Package Width	Mounting Type	Output Configuration
Texas Instruments UC3879DW	Step-Down Step-Up	1	50 %	Yes	300 kHz	Frequency Control Ramp Soft Start	70 °C	Transistor Driver	Yes	4	Half-Bridge	20 V	9 V	0.295 in	20-SOIC	7.5 mm	Surface Mount	Positive
Texas Instruments UC3879DWTR	Step-Down Step-Up	1	50 %	Yes	300 kHz	Frequency Control Ramp Soft Start	70 °C	Transistor Driver	Yes	4	Half-Bridge	20 V	9 V	0.295 in	20-SOIC	7.5 mm	Surface Mount	Positive
Texas Instruments UC3879N	Step-Down Step-Up	1	50 %	Yes	300 kHz	Frequency Control Ramp Soft Start	70 °C	Transistor Driver	Yes	4	Half-Bridge	20 V	9 V	0.3 in	20-DIP 20-PDIP	7.62 mm	Through Hole	Positive
Texas Instruments UC3879DWG4	Step-Down Step-Up	1	50 %	Yes	300 kHz	Frequency Control Ramp Soft Start	70 °C	Transistor Driver	Yes	4	Half-Bridge	20 V	9 V	0.295 in	20-SOIC	7.5 mm	Surface Mount	Positive

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

UC3879N | Datasheet

Phase Shift Resonant Controller datasheet (Rev. B)